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• Do not hold onto the motor cover or any This symbol appears in various locations on other parts of your outboard motor while your Suzuki product to refer you to important getting on or off your boat. information in the owner’s manual.
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FOREWORD • Never remove the flywheel cover (except for when emergency starting). Thank you for choosing a Suzuki outboard motor. Please read this manual carefully and NOTE: review it from time to time. It contains important Mounting radio transceiver or navigational...
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LOCATION OF SAFETY LABELS ..8 LOCATION OF PARTS......9 MOTOR MOUNTING......12 BATTERY INSTALLATION ....12 USE OF ELECTRICAL ACCESSORIES ........14 SUZUKI KEYLESS START SYSTEM (IF EQUIPPED WITH KEYLESS ........15 START SYSTEM) PROPELLER SELECTION, INSTALLATION AND REMOVAL ... 19 ADJUSTMENT........
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NOTE: Oxygenated fuels are fuels which contain oxy- gen-carrying additives such as alcohol. Suzuki recommends that you install a water- separating fuel filter assembly between your boat’s fuel tank(s) and outboard motor(s). Fuel filtration systems of this type will help prevent DF300BMD/350AMD water that may be present in your boat’s fuel...
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Pump Labeling for Gasoline/Alcohol NOTICE Blends In some states, pumps that dispense gasoline/ Gasoline kept in the fuel tank for long periods alcohol blends are required to be labeled for the of time will produce varnish and gum, which type and percentage of alcohol content, and can damage the engine.
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Oil quality is a major contributor to your engine’s performance and life. Always select good quality engine oil. Suzuki recommends the use of SAE 10W-40 or 10W-30 SUZUKI MARINE 4-CYCLE ENGINE OIL. If SUZUKI MARINE 4-CYCLE ENGINE OIL is not available, select a NMMA certified...
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LOCATION OF SAFETY LABELS Read and follow all of the labels on your out- Keep the labels on your outboard motor or fuel board motor or fuel tank. Make sure you under- tank. Do not remove them for any reason. stand all of the labels.
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LOCATION OF PARTS DF300B/325A/350A Flush plug Motor cover Power trim and tilt (PTT) switch Tilt limit cam Clamp bracket Engine oil drain plug Anode Anode Flush plug Water intake hole Anti-cavitation plate Anode Transom XX Anode Pilot water hole Manual release screw Plug for gear oil level...
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DF300BMD/350AMD Flush plug Motor cover Power trim and tilt (PTT) switch Engine oil Clamp bracket drain plug Anode Anode Flush plug Water intake hole Anti-cavitation plate Anode Transom XX Anode Pilot water hole Manual release screw Plug for gear oil level...
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MULTI-FUNCTION GAUGE KEYLESS FOB (Option) (IF EQUIPPED WITH KEYLESS START SYSTEM) Power trim and tilt (PTT) switch Shift lock button Remote control handle Throttle only switch Throttle only switch Select switch Select switch THROTTLE SELECT ONLY Emergency stop switch Type A Type B REMOTE CONTROL BOX (Option) Priming bulb...
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NOTE: boat’s “Certification Plate”. Contact your • The specifications listed above are the mini- authorized Suzuki marine dealer if you are mum battery rating requirements for starting unable to locate the hull “Certificate Plate”. the engine.
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Suzuki recommends that you install the termi- • Be sure to attach battery leads correctly. nal cap on the positive battery terminal to pre- •...
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Be sure to check if the optional 40 A fuse in OPT position is blown, when the second battery for accessories will not be charged. Please ask your authorized Suzuki Marine Dealer for installation of the isolator lead assembly.
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Keyless fob Keyless control unit V WARNING NOTE: Please consult with a Suzuki Marine Dealer for the installation of the Keyless Start System. The keyless fob emits radio waves that may interfere with aircraft operations. Also refer to the “Keyless Start System Instruc- tion Manual”...
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• If the keyless fob is lost, immediately contact may cause ignition, electric shock, or injury. your authorized Suzuki Marine Dealer. Do NOT attempt to disassemble (except for • The keyless fob uses a weak radio wave that...
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V CAUTION Switching the communication mode of the keyless fob Press and hold the lock button 1 on the key- • There is a danger of explosion if the battery less fob for more than one second to switch is replaced with an incorrect type. between ON mode and OFF mode.
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To replace the keyless fob battery: 3. Insert a flat blade screwdriver into the slot at 1. Insert a flat blade screwdriver in the slot of mark on the cover to remove the bat- the keyless fob and remove the cover. tery.
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Installing a propeller with either too much or too little pitch will cause incorrect maximum engine speed, which may result in severe damage to the motor. Ask your authorized Suzuki marine dealer to assist you in selecting a suitable propeller for your boat. NOTICE...
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Propeller installation To install the propeller on your outboard motor, use the following procedure: 1. Coat the propeller shaft splines 1 liberally with Suzuki water resistant grease to help prevent corrosion. 2. Place the front propeller stopper 2 on the NOTE: •...
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• Front propeller nut is left hand thread. • For removing or installing the front propeller nut, the “Propeller nut remover & installer” (Suzuki genuine part), is required. Consult your authorized Suzuki marine dealer for Suzuki genuine parts. 5. Remove the front propeller nut spacer 9, front propeller 0 and front propeller stopper A from the propeller shaft.
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ADJUSTMENT V WARNING TRIM ANGLE ADJUSTMENT Trim angle greatly affects steering stability. If To help maintain steering stability and good the trim angle is too small, the boat may performance, always maintain the proper trim “plow” or “bow steer”. If the trim angle is too angle as shown in the illustration.
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Adjustable item Friction and detent force Friction IDLE SPEED ADJUSTMENT The idle speed has been factory adjusted between 550 – 650 r/min in neutral. NOTE: If idle speed cannot be set within the specified range, contact your authorized Suzuki Marine Dealer.
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Motor cover NOTE: There is information that cannot be displayed depending on the model and equipment. NOTE: Consult your authorized Suzuki marine dealer for setting up the multi-function gauge. NOTICE NOTE: For details the proper handling of the multi- If the oil dipstick knob is not correctly posi-...
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BUTTON FUNCTIONS SCREEN SELECTION The multi-function gauge has four buttons: The multi-function gauge can select the display [MENU], [ ], [ ], and [SET]. screen from the following choices. • Engine Speed • Ground Speed/Fuel Information • Fuel Information • All Items Display Screen (Full Item) To select the display screen: Press the [SET] button and select the desired display screen.
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Digital Analog 2. Speed/Fuel Information Display Screen The speed 1, fuel level 2, sub information No.1 3 and time 4 are displayed. No.2 The sub information display can be switched by pressing the [ ] or [ ] buttons. No.3 This screen can be selected between digital No.4 and analog display.
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SUB INFORMATION SELECTION 1. Total operating hours When the Engine Speed, Ground Speed/Fuel The total operating hours from brand-new Information or Fuel Information screen is dis- engine are displayed. played, press the [ ] or [ ] button to switch the sub Information display in the following sequence.
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5. Instantaneous fuel flow 9. Total fuel used This screen indicates the instantaneous fuel This screen indicates the total fuel used of flow of each outboard motor. all outboard motors installed. 6. Total Instantaneous fuel flow 10.Latitude/Longitude This screen indicates the total instantaneous The latitude and longitude of current boat fuel flow of all outboard motors installed.
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MENU INFORMATION SELECTION Day or Night The menu screen is displayed when the MENU Press the [ ] or [ ] button to select “Day or button is pressed while any screen is displayed. Night”. Next, select “Day” or “Night” using the While the menu screen is displayed, press the [SET] button.
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2. Auto Trim NOTE: • “ A” is not displayed if the trim position does Sets the Auto Trim mode. Set the outboard motor to the full trim down not appear on the multi-function gauge position. Use the [ ] or [ ] buttons to select screen.
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Data Output NOTE: Display For details the proper handling of the multi- Tacho function gauge, refer “OPERATION INSTRUCTION MANUAL” packed in the gauge. Speed & Fuel Fuel ON OFF Press the [ ] or [ ] button to select “Data Output”...
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6. Keyless You can display the Keyless Start System pass- Device List CAN 2 code. You can also change the passcode. (1) If you have the keyless fob 34200-96L41 • Confirm the keyless fob is within the com- 33920-98L20 munication range of the Keyless Start 33920-98L20 System.
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Passcode appears once the [SET] button is pressed after you have entered all 6 digits. Language (2) If you do not have the keyless fob When the keyless start system starts up, English enter your passcode, and you can change it Français within 1 minute after unlocking.
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Quantity: set the unit for fuel quantity. Time Press the [SET] button to select the unit. Setting for the time indication. Clock: setting for display/non-display of the clock. Press the [SET] button to select “ON” or “OFF.” G ( US ) G ( IMP ) Quantity Speed Scale HIGH...
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The buzzer sound also stops when the cause is eliminated. Position Setting for the gauge and engine position. Consult your authorized Suzuki marine dealer for setting change of “Position”. Caution message Caution alarm icon Component Setting Settings for component.
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If the Caution System activates while you are operating your outboard motor, stop the motor as soon as possible and correct the problem or consult your authorized Suzuki marine dealer for assistance. INDICATOR CHECK If equipped with Keyless Start System:...
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Over-Revolution Caution the oil level is correct, consult your authorized System. Suzuki Marine Dealer. Consult your authorized Suzuki marine dealer NOTICE if the Over-Revolution Caution System acti- vates for no apparent reason. Your engine may become severely damaged If you rely on the Oil Pressure Caution System to indicate the need to add engine oil.
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If either of the above situa- heat range. tions arises, your authorized Suzuki Marine Dealer must be consulted as soon as possible. If this system activates, the “Overheat” and cau-...
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V WARNING the eliminating the cause. In order to cancel this ALERT SYSTEM, quickly Failure to take proper precautions when stop the engine and consult with SUZUKI inspecting or servicing the battery can be haz- marine dealer. ardous. Do not attempt to inspect or service the bat- tery without first reading the warnings, cau- tions, and instructions in the “BATTERY...
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However, the caution alarm icon is displayed until eliminating the cause. NOTICE If this system activates for no apparent rea- son, there may be a problem with the system. Consult your authorized Suzuki marine dealer.
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If this system activates for no apparent rea- If this system activates for no apparent rea- son, there may be a problem with the system. son, there may be a problem with the system. Consult your authorized Suzuki marine dealer. Consult your authorized Suzuki marine dealer.
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Consult your authorized Suzuki marine dealer. GAUGE COMMUNICATION CAUTION SYSTEM This system activates when there is a commu- nication error of the gauge.
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The “Check Station Setting” indication clears when any of the button is pressed in the gauge. The “Check Troll System” indication clears when any of the button is pressed in the gauge. If this system activates, consult your authorized Suzuki Maine Dealer.
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– The keyless fob battery has sufficient capacity. – The correct keyless fob has been authenti- cated by the Keyless Start System. • If this caution system activates continuously, contact your authorized Suzuki Maine Dealer.
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– Contact failure of the battery terminal. This diagnostic code is designed to appear • If this caution system activates continuously, while the Keyless Start System is in ON consult your authorized Suzuki Maine Deal- state. erer. If not equipped with Keyless Start System: This diagnostic code is designed to appear while the ignition key is turned on.
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CANCELLATION OIL CHANGE REMINDER For the single engine: SYSTEM 1. If equipped with Keyless Start System: Press and hold the engine switch 1 for more This system informs the operator of the time for than two seconds to turn on the power. replacing engine oil on the basis of the mainte- nance schedule.
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4. If equipped with Keyless Start System: If not equipped with Keyless Start System: Press and hold the engine switch 1 for more Turn the ignition key to the “ON” position. than two seconds to turn off the power. NOTE: The power can also be turned off by pressing the lock button on the keyless fob.
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If this system activates, stop the engine imme- diately, if wind and water conditions are safe to do so, and check the fuel filter/water separator for water. Or consult your authorized Suzuki marine dealer. For inspection and cleaning of the fuel filter,...
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OPERATION OF TILTING If not equipped with Keyless Start System: SYSTEMS V WARNING POWER TRIM AND TILT The power trim and tilt (PTT) switch on the The “Power Trim and Tilt” is operated by press- side cover can be accidentally activated when ing the switch.
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TILT LIMITER CAM SETTING OF TILT UPPER LIMIT POSITION (DF300B/325A/350A) (DF300BMD/350AMD) If the outboard motor contacts the motor well of If the outboard motor contacts the motor well of the boat while tilting, adjust the tilt limiter cam to the boat during full tilt up operation, the upper limit maximum tilt position.
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3. Make sure that remote control handle is in 1. If equipped with Keyless Start System: “NEUTRAL”. Press and hold the engine switch for more 4. Confirm the select LED lights, if not, depress than two seconds to turn on the power. the select switch on the remote control box.
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3. Lower the motor by pressing the Power Trim DF300B/325A/350A and Tilt “DOWN” switch, until the motor is supported by the Tilt Lock Lever. DF300B/325A/350A DF300BMD/350AMD DF300BMD/350AMD DF300BMD/350AMD DF300BMD/350AMD V CAUTION The motor is very heavy. When you tilt it man- 4.
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If not equipped with Keyless Start System: NOTICE V CAUTION If you do not retract the trim rams completely when mooring, they may become deteriorated The remote Power Trim and Tilt switch will or corroded. work when the ignition key is off. If someone activates the switch while you are moving the Be sure to retract the trim rams completely tilt lock lever, your hand could be injured.
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OPERATION OF MOTOR INSPECTION BEFORE COVER LEVER BOATING V WARNING MOTOR COVER REMOVAL Remove the motor cover by unlocking the lever 1, 2 and 3. Pull out and turn up the levers to Failure to inspect your boat and motor before unlock.
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To fill the engine oil: 1. Remove the oil filler cap. 2. Fill the recommended engine oil to the upper level. NOTE: If the engine oil is contaminated or discolored, replace with fresh engine oil (Refer to Inspec- tion and maintenance/engine oil section). 3.
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BREAK-IN 4. Tighten the oil filler cap securely. • Check the battery solution level. Proper operation during this break-in period will The level should be kept between the MAX help ensure maximum life and performance and the MIN level lines at all times. If the from your engine.
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OPERATION NOTE: You may throttle up beyond the recommended operating range to plane your boat, then imme- ENGINE SWITCH (OPTION) diately reduce the throttle to the recommended Use this switch if equipped with Keyless Start operating range. System. • Quickly press the engine switch to start and 2.
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CONTROL PANEL (OPTION) Start & Stop Switch This is a switch to start and stop the engine. The engine can be started with the remote con- trol handle at the neutral position. For dual engine For triple engine ] (UP) & [ ] (DOWN) The “Power Trim and Tilt”...
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• If the THROTTLE ONLY mode cannot be selected, turn off the power and wait for 20 seconds, and then turn on the power again. • Consult your authorized Suzuki marine dealer if the THROTTLE ONLY mode can not be selected.
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1st station, turn off the power and wait for 20 seconds, and then turn on the power again. • Consult your authorized Suzuki marine dealer if the station can not be selected. SELECT 3. Make sure the motor is in “NEUTRAL”.
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STARTING THE ENGINE V WARNING Exhaust gas contains carbon monoxide, a dangerous gas that is difficult to detect because it is colorless and odorless. Breath- ing carbon monoxide can cause death or severe injury. Never start the engine or let it run indoors or where there is little or no ventilation.
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(3) To start each engine individually, press and To start each engine individually, turn the igni- hold the engine switch for at least 2 seconds tion switch to the “ON” position. Then press the to set Keyless Start System to ON state control panel start/stop switch to start each (buzzer sounds once).
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If you notice that water does not spray out of the pilot water hole, stop the engine as soon as possible and consult your authorized Suzuki Marine Dealer. 2. “Enter Passcode?” appears when any button in the gauge is pressed.
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3. Enter a 6-digit passcode. To start the engine: Use the [ ] or [ ] buttons to select a num- 5. Make sure the motor is in “NEUTRAL”. ber for each digit. Press the [SET] button to move to the next digit.
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SHIFTING AND SPEED CONTROL NOTE: • When the engine stops, the clutch moves to NOTICE the neutral position irrespective of the posi- tion of the remote control lever. • The clutch cannot be changed over either to • Severe engine damage may occur if (a) Forward or Reverse by operating the remote engine speed is not allowed to return to idle control lever while the engine stops.
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STOPPING THE ENGINE A detent or notch is present on all Suzuki con- trol boxes to provide a “feel” for positions A, B, NOTE: and neutral. Always shift quickly and firmly from When it is necessary to stop the engine in an...
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4. Turn the Keyless Start System to OFF NOTICE (locked) status by one of the following meth- ods. If the Keyless Start System is in ON state • Make sure that the keyless fob is within while the engine is not running, the battery the communication range of the keyless will be discharged.
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If not equipped with Keyless Start System: NOTICE To stop the engine: 1. Shift into “NEUTRAL”. If the ignition key is left ON when the engine is 2. After operating at full throttle, cool off the not running, the battery will discharge. engine a few minutes by allowing it to idle or troll at low speed.
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] or [ ] button. NOTE: OPERATION IN SHALLOW WATER Please contact your authorized Suzuki Marine When operating your boat in shallow water, it Dealer for more information. may be necessary to tilt the motor higher than the normal trim angle. When you tilt the motor...
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Example of the troll mode display on the multi- function gauge that can operate the troll mode. • This icon appears on the screen of the multi-function gauge that was operated to Example of the troll mode display on the multi- get into the troll mode, and function that cannot operate the troll mode.
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600 r/min to 1200 r/min using the • When pressing the [ ] button, one short “UP” button or “DN” switch. beep sounds engine speed decreases by 50 r/min. TROLL MODE Troll mode switch NOTE: Please contact your authorized Suzuki Marine Dealer for more information.
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Setting the Troll Mode Adjusting Trolling Speed 1. Shift into forward or reverse gear and make • When pressing the “UP” switch, one short sure that the throttle is fully closed (in-gear beep sounds engine speed idle speed). increases by 50 r/min. 2.
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MOTOR REMOVAL If it is necessary to remove the outboard motor from your boat, we recommend that you ask your authorized Suzuki Marine Dealer to do the work for you. MOTOR TRANSPORTING When transporting the motor, place the motor either vertically or horizontally.
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NOTICE NOTICE If the oil dipstick knob is not correctly posi- If you are not careful when resting the out- tioned when installing the motor cover, the oil board on its side and do not take proper pre- level gauge would be damaged. cautions such as first draining the engine oil and cooling water completely, damage can When the motor cover is to be attached, make...
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INTEGRATED STEERING MODEL To trailering the motor, you must obtain steering stopper (Suzuki genuine part). NOTE: • Consult your authorized Suzuki marine dealer for Suzuki genuine parts. • Refer to the “Steering Stopper Operation Manual” supplied with the product for detailed operating instructions.
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INSPECTION AND MAINTENANCE MAINTENANCE SCHEDULE V WARNING It is important to inspect and maintain your out- board motor regularly. Follow the chart below. At each interval, be sure to perform the indi- Exhaust gas contains carbon monoxide, a dangerous gas that is difficult to detect cated service.
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When replacing Be sure to have maintenance performed parts on your outboard motor, Suzuki strongly according to the schedule in the above chart. recommends that you use genuine Suzuki Suzuki recommends that only your authorized parts or their equivalent.
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SPARK PLUG NOTICE When servicing the iridium/platinum spark plugs, do not touch the center electrode, as it is easy to damage. Do not touch the center electrode of an irid- ium spark plug. Avoid cleaning it or adjusting its electrode gap. 5.
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Inspect the spark plug for electrode wear, car- NOTICE bon deposits or insulator damage. If the elec- trode has excessive wear, carbon deposits or When servicing the iridium/platinum spark insulator damage, then the spark plug should plugs, do not touch the center electrode, as it be replaced.
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Consult your authorized level gauge would be damaged. Suzuki Marine Dealer if it is necessary to replace them. When the motor cover is to be attached, make sure that the oil dipstick knob is positioned as Breather line shown in the figure.
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ENGINE OIL 3. Place a drain pan under the engine oil drain screw. V WARNING V CAUTION Never perform any ENGINE OIL procedure with the motor running, as serious injury can The engine oil temperature may be high occur. enough to burn your fingers when the drain plug is loosened.
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7. Check the engine oil level. 9. Reinstall the oil filler cap. V WARNING Engine oil can cause injury to people or pets. Repeated, prolonged contact with used UPPER LIMIT engine oil may cause skin cancer. Even brief contact with used oil may irritate skin. •...
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To check the gear oil: 4. Reinstall and tighten the two plugs. 1. Make sure the motor is in an upright posi- tion. To change the gear oil: 2. Remove the gear oil level plug 1 and plug 1. Center the steering, operate the Power Trim for gear oil level adjustment hole 2.
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If the gear oil has a milky color, it is contami- nated with water. Immediately contact your authorized Suzuki marine dealer for advice. Do not operate your outboard until the oil is changed and the cause of the contamination is corrected.
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Inspect and clean the fuel filter as follows: 6. Place a rag under the filter before removal to catch any spilled fuel. 7. Separate the filter cup 4 from the cap 2 by 1. Turn the engine off and allow it to cool. 2.
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If any water exists in the fuel filter cup, remove the cup and drain the water. Always dispose of excess fuel safely. For questions, consult your authorized Suzuki Marine Dealer. LUBRICATION Proper lubrication is important for the safe, smooth operation and long life of each working Swivel bracket part of your outboard motor.
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4. DF300B/325A/350A: Remove the PTT cables from the clamp 2. DF300BMD/350AMD: Marine-grade Remove the PTT cable clamp 2 from the water resistant starboard side cover 3. grease 5. Remove the side cover bolts and starboard (Grease Gun) side cover 3.
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Transom “XX” only Do not use powered grease guns when servic- ing grease nipple on the mount oil seal cover. NOTE: If grease will not inject into the fitting, consult your Authorized Suzuki Marine Dealer.
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• Periodically clean anodes with a wire brush to remove any coating which might decrease their protective ability. NOTE: Consult your authorized Suzuki Marine Dealer for inspection and replacement of internal anodes attached to the cylinder block/cylinder head. DF300B/325A/350A...
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V WARNING DF300BMD/350AMD DF300BMD/350AMD DF300BMD/350AMD If you are not careful when checking or servic- ing the battery, you can cause a short circuit, which could result in an explosion, fire, or cir- cuit damage. Disconnect the negative (black) cable when checking or servicing the battery.
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1. Make sure that the motor is stopped. 2. Install the flushing attachment (Suzuki genu- ENGINE RUNNING – Vertical position – ine part) 1 so that the water intake hole is Suzuki recommends that you flush the water covered by the attachment.
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ENGINE NOT RUNNING 5. Place the remote control handle in the – Vertical position – “NEUTRAL” position with the propeller removed and start the motor. As soon as the 1. Make sure that the motor is stopped. 2. Remove one of the plug A or C from the engine starts, water should spray out of the pilot water hole 4, indicating proper water two flushing ports.
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SUBMERGED MOTOR 4. Turn on the water to obtain a good water flow. Flush the engine for about five minutes. 5. Turn off the water. A motor that has been accidentally submerged 6. Remove the hose and connector (if used) in water must be overhauled as soon as possi- then reinstall the plug into the flushing port.
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STORAGE PROCEDURE 7. Take the motor to your authorized Suzuki Marine Dealer as soon as possible to be overhauled. MOTOR STORAGE When storing your motor for a long period of NOTICE time (for example, at the end of the boating sea- son), it is recommended that you take your motor to your authorized Suzuki Marine Dealer.
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AFTER STORAGE NOTICE When taking your motor out of storage, follow Severe engine damage can occur in as little as the procedure below to return it to operating 15 seconds if the engine is started without condition: supplying water to the cooling system. 1.
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Caution system is activated (Caution If you are not sure about the proper action to buzzer sounds. Caution LEDs lights.): correct a problem, consult your Suzuki marine • Cooling water passage is clogged. dealer. • Thermostat is failed.
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FUSE Engine vibrates excessively: 1. If equipped with Keyless Start System: • Propeller is damaged. Turn the Keyless Start System OFF. • Engine mounting bolts or clamp screws are loose. If not equipped with Keyless Start System: Turn the ignition key to the “off” position. The Keyless Start System does not turn 2.
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If a new fuse blows in a short time after instal- lation, you may have a major electrical system problem. Consult your SUZUKI marine dealer. Sub battery cable fuse case 5. Inspect the fuse and replace with new fuse if needed.
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Spare fuses 0, A and B are provided for the back of fuse box cover. SPECIFICATIONS DF300B DF350A Item DF325A DF300BMD DF350AMD Engine Type 4 Stroke Number of Cylinders Bore and Stroke 98.0 × 97.0 mm (3.86 × 3.82 in)
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INFORMATION REGARDING EC – DIRECTIVE (For European countries) Sound Pressure Level Regulation Sound pressure level limit 2013 / 53 / EU 75 dB(A) Sound pressure level is measured according to ISO 14509-1:2018. FLOWCHART OF OIL CHANGE REMINDER SYSTEM Action Starting operation (*1) (*4) Indication...
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