LEHR LP2.5 HP Service Manual
  1. Manuals
  2. Brands
  3. LEHR Manuals
  4. Outboard Motor
  5. LP2.5 HP
  6. Service manual

LEHR LP2.5 HP Service Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

LP2.5 Service Manual
P r o p a n e O u t b o a r d E n g i n e
Technical Specifications and Step by Step Guides
Your LEHR Authorized Dealer and Service Provider
Call Toll Free: 1-877-666-8679
Phone : 310.839.9009
Fax : 310.943.2172
Email : support@golehr.com

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the LP2.5 HP and is the answer not in the manual?

Questions and answers

Related Manuals for LEHR LP2.5 HP

Summary of Contents for LEHR LP2.5 HP

  • Page 1 Your LEHR Authorized Dealer and Service Provider Call Toll Free: 1-877-666-8679 LP2.5 Service Manual P r o p a n e O u t b o a r d E n g i n e Technical Specifications and Step by Step Guides Phone : 310.839.9009...
  • Page 2 LEHR LP2.5 HP Rev.A 2013 Service Manual Table of Contents General Information and Specifications Fuel Systems Ignition Powerhead Gearcase Miscellaneous Parts Book Reference Operators Manual Reference...
  • Page 3 LEHR LP2.5 HP Rev.A 2013 General Information and Specifications Understanding Propane General Specifications Engine Profile Line Drawing Maintenance Specifications Maintenance Schedule Engine Fastener Torque Specifications General Torque Values Quick Notes Fuel Consumption Chart Special Tools Adjusting Engine Idle Speed Checking the Spark Plug Changing the Engine Oil Changing the Gearcase Oil...
  • Page 4 LEHR LP2.5 HP Rev.A 2013 UNDERSTANDING PROPANE SAFETY WARNINGS FOR PROPANE UNITS NOTE: FIRE/EXPLOSION HAZARD NOTE: Use propane only in containers and/or remote Contains enough gas to cause serious re, explosion, larger tanks speci cally designed and approved for this and burns.

  • Page 5: General Specifications

    LEHR LP2.5 HP Rev.A 2013 General Specifications Item Model LP 2.5 S Dimension Overall length 623 mm (24.5 in) Overall width 345 mm (13.6 in) Overall height 1,021 mm (40.2 in) Boat transom height 381mm (15.0in) Weight 17.2 kg (37.9 lb)
  • Page 6 LEHR LP2.5 HP Rev.A 2013 General Specifications Item Model LP 2.5 S Fuel and oil Propane Fuel type 110 Octane Fuel rating 4-stroke motor oil 10W-30 Engine oil type SE, SF, SG, SH, or SJ (API) Engine oil grade 0.35 L (0.37 US Quarts) (12 oz.)
  • Page 7 LEHR LP2.5 HP Rev.A 2013 LEHR INC. PROPANE POWERED OUTBOARD MARINE ENGINE MODEL: LP2.5S 14.50 25.50 17.00 16.50 4.25 12.00 11.00 14.13 2.25 9.00 23.50 14.50 12.50 11.00 15.25...
  • Page 8 LEHR LP2.5 HP Rev.A 2013 Maintenance Specifications : Power Unit Item Model LP 2.5 S Power unit Minimum compression pressure* 700 kPa (7.0 kgf/cm², 102 psi) Cylinder head Warpage limit 0.1 mm (0.004 in) Cylinder Bore size 54.000-54.015 mm (2.1260-2.1266 in) Taper limit 0.08 mm (0.0031 in)
  • Page 9 LEHR LP2.5 HP Rev.A 2013 Item Model LP 2.5 S Oil ring 1.87-1.95 mm (0.0736-0.0768 in) Thickness 2.10-2.40 mm (0.0827-0.0945 in) Width 0.20-0.70 mm (0.0079-0.0276 in) End gap 0.06-0.16 mm (0.0024-0.0063 in) Side clearance Camshaft Intake and exhaust Base diameter and lobe height 26.139-26.239 mm (1.0290-1.0330 in)
  • Page 10 LEHR LP2.5 HP Rev.A 2013 Item Model LP 2.5 S Connecting rod Small end inside diameter 12.006-12.020 mm (0.4727-0.4732 in) Big end inside diameter 24.000-24.015 mm (0.9449-0.9455 in) Big end side clearance 0.2-0.6 (0.008-0.024 in) Crankpin oil clearance 0.016-0.046 mm (0.0006-0.0018 in)

  • Page 11: Maintenance Schedule

    REPLACEMENT PARTS If replacement parts are necessary, use only genuine LEHR parts or parts of the same type and of equivalent strength and materials. Any part of inferior quality may malfunction, and the resulting loss of control could endanger the operator and passengers.
  • Page 12 LEHR LP2.5 HP Rev.A 2013 Engine Fastener Torque Specifications Thread Size Item Tightening Torques N•m kgf•m ft•lb Power Unit Step Connecting rod cap Step Step Crankcase bolt Step 10.3 Step Cylinder head bolt 22.1 Step Step Cylinder head cover bolt...

  • Page 13: General Torques

    LEHR LP2.5 HP Rev.A 2013 General Torques This chart specifies tightening torques for standard fasteners with a standard ISO thread pitch. Tightening torque specifications for special components or assemblies are provided in applicable sections for this manual. To avoid warpage, tighten multi-fastener assemblies in a crisscross fashion and progressive stages until the specified torque is reached. Unless otherwise specified, torque specifications require clean, dry threads. Components should be at room temperature. Tightening Torques Bolt or Nut...
  • Page 14 LEHR LP2.5 HP Rev.A 2013 Quick Notes Commonly Referred to Specifications Carburetor Metering Needle Base Settings measured from the flat of the slide to the tip of the needle 17.8 mm ( 0.716 in ) Test Tank Minimum RPM WOT Specifications with a standard propeller with a maximum of 24.1cm or (9 ½”) water level as mea-...
  • Page 15 LEHR LP2.5 HP Rev.A 2013 Quick Notes Commonly Referred to Specifications How to read engine Serial Number Code: Example….LP2.5S 13C00031 LP2.5L 00031 Model Year Month Engine Number Lehr Propane 2.5 HP Short Shaft Year built 2013 Month built March (Month built uses alpha A thru L for Jan thru Dec)
  • Page 16 LEHR LP2.5 HP Rev.A 2013...
  • Page 17 LEHR LP2.5 HP Rev.A 2013 Service Tools I J K L M N A Digital Multimeter B Compression Pressure Gauge C Universal Puller D Spark Tester E Inductive Tachometer F Calipers G Paper Clip H Feeler Gauge (Assorted Metric Hand Tools I J K L M N)
  • Page 18 LEHR LP2.5 HP Rev.A 2013 Adjusting Engine Idle Speed 1. Place engine in a suitable water filled test tank. Water level should be approximately 9 ½” from the top of the transom. Hook up an inductive tachometer suitable for a single cylinder, four stroke engine. Start the engine and allow it to warm up to proper oper- ating temperature, about 3 minutes.

  • Page 19: Checking The Spark Plug

    LEHR LP2.5 HP Rev.A 2013 Checking the Spark Plug Remove the upper engine cover. Remove the rubber access grommet from the lower motor cover. Remove spark plug through the access port. Inspect the spark electrodes for wear or combustion deposits.

  • Page 20: Changing The Engine Oil

    LEHR LP2.5 HP Rev.A 2013 Changing the Engine Oil 1. Remove the oil filler cap Place a drain pan under the drain hole , and then remove the drain bolt and let the oil drain completely. *Cover has been removed for reference Inspect the copper washer, replace if necessary.
  • Page 21 INSPECTING AND REPLACING ANODE • Always use new gaskets. LEHR outboard motors are protected from corrosion by a sacrificial anode. Inspect the external anode • Do not reuse the removed gaskets. periodically. Remove scales from the surfaces of the anode. Do not paint the anode, as this would render 5. With the outboard motor in a vertical position and using a flexible or pres-...

  • Page 22: Lubrication Points

    LEHR LP2.5 HP Rev.A 2013 Lubrication Points 1. Apply water resistant anit-corrosion grease to the areas shown. Apply grease to the grease nipple until it flows from the bushings.
  • Page 23 LEHR LP2.5 HP Rev.A 2013 Valve Lash Check (Engine must be cold) Perform at 10 Hours and every 100 hours after that. Remove the emergency stop lanyard from the emergency stop switch on the tiller arm. Remove the rear carrying handle, rear lower engine cover, and spark plug.
  • Page 24 LEHR LP2.5 HP Rev.A 2013 3. Rotate the crankshaft to TDC (Top Dead Center) on the compression stroke and as the intake valve completely closes, stop! Both intake and exhaust valves should now be completely closed and the rocker arms loose. The piston should be at the top of the cylinder.
  • Page 25 LEHR LP2.5 HP Rev.A 2013 NOTES...
  • Page 26 LEHR LP2.5 HP Rev.A 2013 Propane Fuel Sytem Removing and Replacing the Carburetor Installing the Slide Throttle Cable Cap Adjusting the Idle Speed Removing the Fuel Line Assembly Assembling the Fuel Line Notes...
  • Page 27 LEHR LP2.5 HP Rev.A 2013 Removing and replacing the carburetor 1. Remove the rubber weatherstrip from the top of the lower cover and flex the cover for additional clearance if needed. 2. With a 16mm wrench, remove the fuel line to carburetor banjo bolt and two rubber washers .
  • Page 28 LEHR LP2.5 HP Rev.A 2013 A. Orient the slide with the brass retainer pin pointing down, then compress the spring with the slide and jiggle it until the pin drops out, releasing the throttle cable core wire. B. The throttle spring, slide, and needle assembly are now free from the throttle cable and cap.
  • Page 29 LEHR LP2.5 HP Rev.A 2013 Installing the Slide and Throttle Cable Cap 1. Screw the carburetor cap onto the throttle cable until it reaches the end of the threads on the 90 degree elbow. The end of the throttle cable must seat inside the relieved side of the retainer pin.
  • Page 30 LEHR LP2.5 HP Rev.A 2013 Adjusting Engine Idle Speed 1. Place engine in a suitable water filled test tank. Water level should be approximately 9 ½” from the top of the transom. Hook up an inductive tachometer suitable for a single cylinder, four stroke engine. Start the engine and allow it to warm up to proper oper- ating temperature, about 3 minutes.
  • Page 31 LEHR LP2.5 HP Rev.A 2013 Removing the Fuel Line 1. Remove the top cover. Remove the rubber seal along the top edge of the bottom covers. 10 mm 14 mm 2. Remove 1 lb. propane bottle connector from end of hose. Hold the brass connector stationary with a 14 mm wrench and unscrew the tube nut with a 10 mm wrench.
  • Page 32 LEHR LP2.5 HP Rev.A 2013 5. Remove the bottom front cover by removing the bolts that hold the cover to the engine using a 10mm socket. You need to swivel the engine on the mounting clamp to have room to access these bolts.
  • Page 33 LEHR LP2.5 HP Rev.A 2013 Assembling the Fuel Line 1. Reassemble the fuel line to the front cover in the sequence as shown. Ensure the O ring and flat rubber washer are properly located in place on reassembly. (Using a new O-ring) Torque to 8 N•m ( 5.9 ft•lbs ) Banjo Bolt...
  • Page 34 LEHR LP2.5 HP Rev.A 2013 NOTES...
  • Page 35 LEHR LP2.5 HP Rev.A 2013 Ignition System Ignition System / Components and Schematic Checking Ignition Spark Testing Engine Stop Switch Checking Ignition Coil Adjusting or Replacing the Ignition Coil Notes...

  • Page 36: Ignition System

    LEHR LP2.5 HP Rev.A 2013 Ignition System In this ignition system, high voltage is induced in the secondary coil when the electric current produced by the primary coil and the magnet on the rotating flywheel is cut off. A small electronic circuit board inside the coil controls spark advance.

  • Page 37: Checking The Ignition Spark

    LEHR LP2.5 HP Rev.A 2013 Checking the Ignition Spark 1. Remove the upper engine cover 2. Remove the lower cover grommet then disconnect the spark plug boot from the spark plug. 3. Connect the spark tester to the spark plug boot and to the spark plug.
  • Page 38 LEHR LP2.5 HP Rev.A 2013 Checking the Engine Stop Switch ctr i cal sys te ms 1. Check the engine stop switch for continuity Checking the engine shut-off switch 2. Disconnect the white wire from the ignition coil pigtail at the bullet connector. plug cap from the Check the engine shut-off switch for con­...
  • Page 39 LEHR LP2.5 HP Rev.A 2013 Testing the Ignition Coil 1. If ignition coil is still on the engine, remove the spark plug cap from the spark plug wire by turning the cap counterclockwise while pulling on the spark plug CAP. Never pull on the spark plug wire.
  • Page 40 LEHR LP2.5 HP Rev.A 2013 Adjusting or Replacing Ignition Coil 1. Remove the spark plug hi tension lead, the bottle bracket assembly, and the starter assembly. Carburetor removed for reference. If replacing, disconnect the primary wire and the ground wire and the two attaching bolts and remove the coil.
  • Page 41 LEHR LP2.5 HP Rev.A 2013 NOTES...
  • Page 42 LEHR LP2.5 HP Rev.A 2013 Powerhead Checking the Cooling System Cooling System Flow Chart Inspect/Replace Thermostat or Sacrificial Anode Replacing the Head Gasket Valve Lash Adjustment Installing a Powerhead Notes...
  • Page 43 LEHR LP2.5 HP Rev.A 2013 Checking the Cooling System Inspect the cooling water inlet holes for obstructions or debris. Clean if necessary. To test for proper operation, place the lower unit in water in a suitable water supply. The water level should be approximately 9½ to 11½...
  • Page 44 LEHR LP2.5 HP Rev.A 2013 Cooling System Flowchart Crankcase Cylinder Block Cylinder Head Cooling Water Upper Midsection Upper Midsection Thermostat Pilot Hole (Top Starboard Side) (Inside) Lower Midsection Atmosphere Water Pump Exhaust Port Cooling Water Inlet Atmosphere Cold Water Hot Water...
  • Page 45 LEHR LP2.5 HP Rev.A 2013 To Inspect or Replace the Thermostat or Sacrificial Anode Remove the bottle bracket assembly bolts* and spacers to gain ac- cess to the thermostat housing. Carburetor removed for reference. Remove the thermostat housing bolts, thermostat housing...
  • Page 46 LEHR LP2.5 HP Rev.A 2013 To Replace the Head Gasket 1. Remove the stop lanyard from the emergency stop switch on the tiller arm. 2. Remove the rear carrying handle, the lower engine cover, spark plug, the propane bottle bracket and carburetor.
  • Page 47 LEHR LP2.5 HP Rev.A 2013 To Replace the Head Gasket (cont.) 10. Rotate the crankshaft to TDC (Top Dead Center) as the intake valve closes and stop. Both intake and exhaust valves should be completely closed. Intake 0.08 ~ 0.15 mm (0.003 ~ 0.006 in) Exhaust 0.08 ~ 0.12 mm (0.003 ~ 0.005 in) Valves are adjusted cold.
  • Page 48 LEHR LP2.5 HP Rev.A 2013 Valve Lash Check (Engine must be cold) Perform at 10 Hours and every 100 hours after that. 1. Remove the stop lanyard from the emergency stop switch on the tiller arm. 2. Remove the rear carrying handle, the lower engine cover, spark plug, and the propane bottle bracket.
  • Page 49 LEHR LP2.5 HP Rev.A 2013 Valve Lash Check (cont.) 5. Rotate the crankshaft to TDC (Top Dead Center) as the intake valve closes and stop. Both intake and exhaust valves should be completely closed. Intake 0.08 ~ 0.15 mm (0.003 ~ 0.006 in) Exhaust 0.08 ~ 0.15 mm (0.003 ~ 0.006 in) Valves are adjusted cold. Adjust both the intake and exhaust valves to specification and lock the adjuster with the lock nut.
  • Page 50 LEHR LP2.5 HP Rev.A 2013 Installing the Power Head to the Midsection 1. Remove the emergency stop lanyard from the emergency stop switch on the tiller arm. 2. Remove the rear carrying handle and the rear lower cover (Section 6-2).
  • Page 51 LEHR LP2.5 HP Rev.A 2013 NOTES...
  • Page 52 LEHR LP2.5 HP Rev.A 2013 Gearcase Checking Gearcase for Oil and Water Leaks Removing the Gearcase from the Mid Section Gearcase Line Drawing Reference Pictures Water Pump Disassembly Installation of Water Pump Installing the Gearcase Notes...
  • Page 53 LEHR LP2.5 HP Rev.A 2013 Check the Gearcase for Leaks 1. Remove the check screw , and then install a pressure tester. 2. Apply 16 PSI pressure to the gearcase. The pressure should remain steady for a minimum of 10 seconds.
  • Page 54 LEHR LP2.5 HP Rev.A 2013 Removing the gearcase to inspect/service water pump 1. Remove the spark plug wire from the spark plug, and place the engine in neutral. 2. Remove the shift rod connector plug on the exhaust housing and loosen the shift rod connector bolt A.
  • Page 55 LEHR LP2.5 HP Rev.A 2013 Gearcase Exploded View LP2.5 LOWER UNIT DRIVE PARTS LP2.5 LOWER UNIT DRIVE PARTS LP2.5 LOWER UNIT DRIVE PARTS DWG NO DESCRIPTION DWG NO DWG NO DESCRIPTION DESCRIPTION Q'TY Q'TY LEHR PART NO LEHR PART NO MSRP...
  • Page 56 LEHR LP2.5 HP Rev.A 2013 Water Pump Disassembly 1. Place the gearcase in a suitable holding fixture and remove the 4 bolts that attach the water pump housing assembly to the gearcase. 2. Slide the pump housing up the shaft, noting the condition and assembly order of the water pump parts.
  • Page 57 LEHR LP2.5 HP Rev.A 2013 Installing the Water Pump Impeller 1. Install the dowels , new o-ring , and stainless steel plate Apply film of grease to the impeller blades and impeller cup. 2. Install the impeller drivepin into the drive shaft 3. Align the groove on the impeller with the drive pin, and then install the im- peller onto the drive shaft.
  • Page 58 LEHR LP2.5 HP Rev.A 2013 Installing the gearcase 1. Grease the driveshaft splines and place the shift rod into neutral gear (push shift rod down). 2. Install the gearcase back onto the midsection, carefully aligning the copper water tube with the impeller housing water tube grommet 3.
  • Page 59 LEHR LP2.5 HP Rev.A 2013 NOTES...
  • Page 60 LEHR LP2.5 HP Rev.A 2013 Miscellaneous Service Removing the Bottle Bracket Removing the Engine Rear Lower Cover Tiller Arm Assembly Tiller Arm Assembly Reference Manual Starter Notes...
  • Page 61 LEHR LP2.5 HP Rev.A 2013 Removing the Bottle Bracket 1. Disconnect and remove the propane bottle if attached. Carburetor removed to better show bracket bushings underneath. 2. The bottle bracket has bolts and spacers retaining it to the engine. Loosen the bolts and remove them one at a time along with the washers and spacer bushings located underneath the bottle bracket.
  • Page 62 LEHR LP2.5 HP Rev.A 2013 Removing the Rear Engine Cover 1. The rear engine cover is retained by 4 bolts on the bottom side of the cover, 2 Phillips head screws, and flat clip nuts located inside the cover on each side where the front and rear covers join. 2. Remove the 2 Phillips heads screws and flat clip nuts inside the cover 3. Using a 10mm socket, remove the 4 bolts located on the bottom of the rear where they attach to the engine.
  • Page 63 LEHR LP2.5 HP Rev.A 2013 Assembling the Tiller Handle 1. Insert the throttle cable into the throttle lever The throttle grip should be in the fully closed posi- tion when installing the throttle cable. GREASE Installing the Tiller Handle 1. Insert the bushing...
  • Page 64 LEHR LP2.5 HP Rev.A 2013 Tiller Handle Reference LP2.5 STEERING PARTS LP2.5 STEERING PARTS DWG NO DESCRIPTION Q'TY LEHR PART NO MSRP l l i t l l i t c t i l i h p i l l i h p i l ×...
  • Page 65 LEHR LP2.5 HP Rev.A 2013 Replacing the Manual Starter Assembly 1. Remove the bottle bracket assembly bolts, being careful to catch the spacer bushings located between the bracket and the engine block. Carefully Swing the bottle bracket to the side and out of the way.
  • Page 66 LEHR LP2.5 HP Rev.A 2013 NOTES...
  • Page 67 LEHR LP2.5 HP Rev.A 2013 DETAILED PARTS LIST AND DIAGRAMS MODEL: LP2.5S...
  • Page 68 LEHR LP2.5 HP Rev.A 2013 LP2.5 LOWER UNIT PARTS...
  • Page 69 LEHR LP2.5 HP Rev.A 2013 LP2.5 LOWER UNIT PARTS DWG NO DESCRIPTION Q'TY LEHR PART NO MSRP l l a t f i t f i t f i t f i × t f i t f i t t i...
  • Page 70 LEHR LP2.5 HP Rev.A 2013 LP2.5 LOWER UNIT DRIVE PARTS 23 24...
  • Page 71 LEHR LP2.5 HP Rev.A 2013 LP2.5 LOWER UNIT DRIVE PARTS DWG NO DESCRIPTION Q'TY LEHR PART NO MSRP l i o n i l n i l n i l l l e l l e t f i t f i...
  • Page 72 LEHR LP2.5 HP Rev.A 2013 LP2.5 STEERING PARTS...
  • Page 73 LEHR LP2.5 HP Rev.A 2013 LP2.5 STEERING PARTS DWG NO DESCRIPTION Q'TY LEHR PART NO MSRP l l i t l l i t c t i l i h p i l l i h p i l ×...
  • Page 74 LEHR LP2.5 HP Rev.A 2013 OB072 CLAMP PARTS...
  • Page 75 LEHR LP2.5 HP Rev.A 2013 LP2.5 CLAMP PARTS DWG NO DESCRIPTION Q'TY LEHR PART NO MSRP ) t f t i l t l i t c i t n i l t l i t t c i t c i...
  • Page 76 LEHR LP2.5 HP Rev.A 2013 LP2.5 POWER SYSTEM...
  • Page 77 LEHR LP2.5 HP Rev.A 2013 LP2.5 POWER SYSTEM DWG NO DESCRIPTION Q'TY LEHR PART NO MSRP g l i s t l l l a l i o l i f l i o l l i f n i l...
  • Page 78 LEHR LP2.5 HP Rev.A 2013 y l f e l l y l f l i o s t l y l f 3mm nut n i l...
  • Page 79 LEHR LP2.5 HP Rev.A 2013 LP2.5 VALVE SYSTEM LP2.5 VALVE SYSTEM DWG NO DESCRIPTION Q'TY LEHR PART NO MSRP...
  • Page 80 LEHR LP2.5 HP Rev.A 2013 LP2.5 CRANKSHAFT ASSEMBLY LP2.5 CRANKSHAFT ASSEMBLY DWG NO DESCRIPTION Q'TY LEHR PART NO MSRP s t l...
  • Page 81 LEHR LP2.5 HP Rev.A 2013 LP2.5 COVERS LP2.5 COVERS LP2.5 STARTING SYSTEM DWG NO DESCRIPTION Q'TY LEHR PART NO MSRP 33.00 glide disk 7.20 l i o 16.50 21.20 p i l guide plate 5.50 guide plate bolt 3.50 6.00 starter pull handle 9.25...
  • Page 82 LP2.5 STARTING SYSTEM LEHR LP2.5 HP Rev.A 2013 LP2.5 STARTING SYSTEM LP2.5 COVERS DWG NO DESCRIPTION Q'TY LEHR PART NO MSRP phillips head screw clip nut sealing strip A620MM OB072.5-003 6.00 sealing strip A620MM OB072.5-004 6.00 hex head bolt M6x25 OB072.5-005...
  • Page 83 LEHR LP2.5 HP Rev.A 2013 LP2.5 ACCESSORIES LP2.5 ACCESSORIES DWG NO DESCRIPTION Q'TY LEHR PART NO MSRP s ' r c t i t i k 4 ft propane connector hose OB072.8-006 LPH4 29.99...
  • Page 84 LEHR LP2.5 HP Rev.A 2013 OPERATOR’S MANUAL PROPANE POWERED OUTBOARD MARINE ENGINE 2.5 HP MODEL: LP 2.5S CAUTION: BEFORE OPERATING THIS PRODUCT, READ AND FOLLOW ALL SAFETY RULES AND OPERATING INSTRUCTIONS. FOR SERVICE TABLE OF CONTENTS Call 1-866-941-LEHR (5347) Important Manual Information............1 General Information.................2...
  • Page 85 UNDERSTANDING PROPANE LEHR LP2.5 HP Rev.A 2013 UNDERSTANDING PROPANE SAFETY WARNINGS FOR PROPANE UNITS NOTE: FIRE/EXPLOSION HAZARD NOTE: Use propane only in containers and/or remote Contains enough gas to cause serious re, explosion, SAFETY WARNINGS FOR PROPANE UNITS NOTE: FIRE/EXPLOSION HAZARD larger tanks speci cally designed and approved for this and burns.

  • Page 86: Important Manual Information

    LEHR outboard motor. Understanding and following these instructions will help you get the most trouble free use from your LEHR outboard. If you have any questions about operation or maintenance of your outboard motor please contact LEHR at 1-866-941-LEHR (5347).

  • Page 87: General Information

    LEHR LP2.5 HP Rev.A 2013 GENERAL INFORMATION • Before mounting or operating the outboard motor, completely read manual and labels. Reading them will give you a good understanding of the motor and its operation. • Before operating the boat, read any owner's or operator's manuals supplied with it and all labels. Be sure you understand all items from the boat manual as well as this engine manual before operating.
  • Page 88 The outboard motor serial number is stamped on the label attached to the clamp bracket. Record your outboard motor serial number, you will need it when ordering spare parts from your LEHR dealer or for reference if your outboard motor is stolen.
  • Page 89 LEHR LP2.5 HP Rev.A 2013 GENERAL INFORMATION FUEL TANK Use a standard 16.4 oz. (1 lb.) propane canister connected to the rear propane tank position or any larger DOT approved propane tank connected to the remote propane connector with an approved high pressure propane hose.
  • Page 90 LEHR LP2.5 HP Rev.A 2013 GENERAL INFORMATION WARNING: Do not overtighten the throttle friction adjuster. If there is too much resistance, it could be difficult to move throttle lever or grip, which could result in an accident. When constant speed is desired, tighten the adjuster just enough to maintain the desired throttle setting.
  • Page 91 LEHR LP2.5 HP Rev.A 2013 GENERAL INFORMATION TRIM ROD The position of the trim rod determines the angle of the outboard motor in relation to the transom. TILT LOCK MECHANISM The tilt support lock keeps the outboard motor in the tilted up position. If the outboard engine needs to be tilted up out of the water or to get the propeller higher than the bottom of the boat, push down on the tiller handle while lifting up on carrying handle.
  • Page 92 LEHR LP2.5 HP Rev.A 2013 INSTALLATION INSTALLATION Incorrect engine height or obstructions to smooth water flow in front of the propeller can cause propeller cavitation while the boat is cruising. Cavitation occurs when the engine speeds up momentarily and suddenly slows as the propeller engages the water.
  • Page 93 LEHR LP2.5 HP Rev.A 2013 OPERATION PRE-OPERATION CHECKS WARNING: If anything in the pre-operation check is not working properly, have it inspected and repaired before operating the outboard motor. Failure to do so could result in an accident. CONTROLS • Check throttle, shift, and steering for proper operation before starting the engine.
  • Page 94 LEHR LP2.5 HP Rev.A 2013 OPERATION INSTALLING THE PROPANE CANISTER 1. Make sure the engine is off. 2. If the propane canister to be installed has a protective plastic cap over the threaded end, remove it. Make sure the canister clamp is in the unlatched position. If the rubber tank plug is in place, remove it.
  • Page 95 LEHR LP2.5 HP Rev.A 2013 OPERATION STARTING ENGINE 1. Place the gear shift lever in neutral. Always start the engine in neutral to avoid accidentally moving the boat. WARNING: Keep hands, hair, and clothing away from rotating parts while the engine is running. Do not touch or remove electrical parts when starting or during operation.
  • Page 96 LEHR LP2.5 HP Rev.A 2013 OPERATION SHIFTING WARNING: Before shifting, make sure no swimmers are in the water near your boat. 1. Place the throttle in the slowest position. 2. Move the gear shift lever quickly into gear from neutral to forward .
  • Page 97 LEHR LP2.5 HP Rev.A 2013 OPERATION BOW DOWN Too much trim-in causes the boat to “plow” through the water, d ecreasing fuel economy and making it hard to increase speed. Operating with excessive trim-in at higher speeds also makes the boat unstable.
  • Page 98 LEHR LP2.5 HP Rev.A 2013 MAINTENANCE TRANSPORTING AND STORING THE OUTBOARD MOTOR WARNING: Leaking fuel is a fire hazard. When transporting or storing the outboard motor, disconnect the propane connector to prevent the possibility of fuel from leaking. Use care when transporting the fuel tank whether in boat or car.
  • Page 99 LEHR LP2.5 HP Rev.A 2013 MAINTENANCE STORING THE OUTBOARD MOTOR NOTE: Place a towel or something similar under the outboard motor to protect it from damage. When storing your outboard motor for prolonged periods of time (2 months or longer), several important procedures must be performed to prevent excessive damage.
  • Page 100 REPLACEMENT PARTS If replacement parts are necessary, use only genuine LEHR parts or parts of the same type and of equivalent strength and materials. Any part of inferior quality may malfunction, and the resulting loss of control could endanger the operator and passengers.
  • Page 101 Oily or dark color ceramic could indicate a malfunction. Do not attempt to diagnose any problems yourself. Instead, take the outboard motor to a LEHR dealer. You should periodically remove and inspect the spark plug because the electric arcing will cause the spark plug to slowly erode and the gap will increase.
  • Page 102 If you have difficulty verifying the idle speed, or the idle speed requires adjustment, consult a LEHR dealer or other qualified mechanic. 2. Verify whether the idle speed is set to specification (2000 150 RPM).
  • Page 103 LEHR LP2.5 HP Rev.A 2013 MAINTENANCE 5. Start the engine and watch to see oil in the sight glass. Make sure that there are no oil leaks. Continued operation with a problem could cause severe engine damage. 6. Turn off the engine and wait 3 minutes. Recheck the oil level using the sight glass. The oil level should cover the metal plate visible just below the sight glass lens, but not so high as to touch the inside of the glass.
  • Page 104 PROPELLER SELECTION Your LEHR outboard engine is supplied with a propeller that matches the needs of a boat most suited to an engine of its size. If you feel you are not getting optimal performance from the engine on your boat, a different pitch propeller could help.
  • Page 105 7. Insert and tighten the gear oil drain screw. INSPECTING AND REPLACING ANODE LEHR outboard motors are protected from corrosion by a sacrificial anode. Inspect the external anode periodically. Remove scales from the surfaces of the anode. Do not paint the anode, as this would render it ineffective.

  • Page 106: Troubleshooting

    A: Inspect spark plug. Clean or replace with recommended type. Q: Is the Idle speed set correctly? A: Adjust Idle screw or have serviced by LEHR dealer. Q: Are fuel joints connected correctly? A: Check for any leaks or smell of propane. Tighten any loose fittings. Replace any faulty fuel lines or connectors.
  • Page 107 Q: Is ignition wire damaged or poorly connected? A: Check wires for wears and breaks. Q: Have electrical wires failed? A: Have serviced by a LEHR dealer. ENGINE VIBRATES EXCESSIVELY Q: Is propeller damaged? A: Have propeller repaired or replaced.
  • Page 108 6. Give a strong pull out to crank and start the engine. Repeat if necessary. PROCEDURE FOR SUBMERGED MOTOR If the outboard motor has been submerged, immediately take it to a LEHR dealer. Some corrosion may begin almost immediately. If you cannot immediately take the outboard to a dealer, follow the procedures below in order to minimize engine damage.

  • Page 109: Specifications

    LEHR LP2.5 HP Rev.A 2013 SPECIFICATIONS MODEL LP 2.5S ENGINE TYPE WATER COOLED 4-CYCLE DISPLACEMENT 72.0 CC BORE X STROKE 54 mm X 31.5 mm POWER 2.5 hp (1.8 kW) MAX OPERATING R.P.M. 3000 - 3500 R. P.M. IDLE SPEED 2000 R.
  • Page 110 • As the marine engine owner, you should however be aware that LEHR may deny you warranty coverage if your marine engine or a part has failed due to abuse, neglect, or improper maintenance or unapproved modifications.
  • Page 111 (d) Emission Warranty Parts List. The following components are included in the emission related warranty of the engine: Carburetor, Fuel Lines & Fittings, Ignition Coil, Spark Plug, Valves, and Cam. LEHR will furnish with each new engine written instructions for the maintenance and use of the engine by the owner.
  • Page 112 LEHR LP2.5 HP Rev.A 2013 NOTES...
  • Page 113 LEHR LP2.5 HP Rev.A 2013 One Star – Low Emission The one-star label identi es Personal Watercraft, Outboard, Sterndrive and Inboard engines that meet the Air Resources Board’s Personal Watercraft and Outboard marine engine 2001 exhaust emission standards. Engines meeting these standards have 75% lower emissions than conventional carbureted two-stroke engines.

Table of Contents

Save PDF