Yard Machines YGBV Operator's Manual page 5

MAINTENANCE AND REPAIR INSTRUCTIONS
WARNING:
Before inspecting, cleaning or servicing the unit, stop the engine, wait for all moving parts
to stop, allow the unit to cool and disconnect the spark plug wire to ensure that the unit cannot start.
Failure to follow these instructions can result in serious personal injury or property damage.
MAINTENANCE SCHEDULE
Perform these required maintenance procedures at the frequency stated in the table. These procedures should also be
a part of any seasonal tune-up.
NOTE: Maintenance, replacement or repair of the emission control devices and system may only be performed by an
authorized service center.
NOTE: Some maintenance procedures may require special tools or skills. If you are unsure about these procedures,
take your unit to an authorized service dealer.
A good preventive maintenance program of regular inspection and care will increase the life and improve performance
the unit. This maintenance checklist is a guide for such a program.
Cleaning, adjusting and part replacement may be required, under certain conditions, at more frequent intervals than
those indicated.
In order to assure peak performance of your engine, inspection of the engine exhaust port may be necessary after 50
hours of operation. If you notice lost RPM, poor performance or general lack of acceleration, this service may be
required. If you feel your engine is in need of this inspection, refer service to any non-road engine repair establishment,
individual or authorized service dealer for repair. DO NOT attempt to perform this process yourself as engine damage
may result from contaminants involved in the cleaning process for the port.
FREQUENCY MAINTENANCE REQUIRED
Before starting engine Fill fuel tank with fresh fuel
Every 10 hours Clean and re-oil air filter
Check and clean spark arrestor
Every 25 hours
Check spark plug condition and gap
Inspect exhaust port and spark arrestor screen for clogging or
Every 50 hours
obstruction to assure maximum performance levels
AIR FILTER MAINTENANCE
Removing the Air Filter/Muffler Cover
1. Remove the four (4) screws securing the air filter/muffler cover
(Fig. 23). Use a T20 Torx bit screwdriver.
2. Pull the cover from the engine. Do not force.
Cleaning the Air Filter
Clean and re-oil the air filter every 10 hours of operation. It is an
important item to maintain. Failure to maintain your air filter properly
can result in poor performance or can cause permanent damage to
your engine.
1. Remove the air filter/muffler cover. Refer to Removing the Air
Filter/Muffler Cover.
2. Turn the cover over and look inside to locate the air filter. Remove
the air filter from inside the air filter/muffler cover (Fig. 24).
3. Wash the filter in detergent and water (Fig. 25). Rinse the filter
thoroughly. Squeeze out excess water. Allow it to dry completely.
4. Apply enough clean SAE 30 oil to lightly coat the filter (Fig. 26).
5. Squeeze the filter to spread and remove excess oil (Fig. 27).
6. Replace the air filter inside the air filter/muffler cover (Fig. 24).
NOTE: Operating the unit without the air filter and air filter/muffler
cover assembly will VOID the warranty.
Reinstalling the Air Filter/Muffler Cover
1. Place the air filter/muffler cover over the back of the carburetor
and muffler. Align the screw holes.
2. Insert the four (4) screws into the holes in the air filter/muffler
cover (Fig. 23) and tighten.
Do not over tighten.
SPARK ARRESTOR MAINTENANCE
1. Remove air filter/muffler cover. Refer to Removing the Air
Filter/Muffler Cover.
2. Locate the muffler, but do not remove it. Find the screw on the
bottom of the muffler (Fig. 28). Remove the screw using either a
torx #20 or flat blade screwdriver.
3. Carefully pry up the left side spark arrestor hood. Two tabs act as
hinges on the right side of the hood. Flip open the spark arrestor
hood like a door and then pull its tabs out of the muffler slots.
4. Using a small flat blade screwdriver, carefully pry the spark
arrestor screen out from the inside of the spark arrestor hood.
5. Clean the spark arrestor screen with a wire brush. If it is damaged
or cannot be cleaned thoroughly, replace the muffler assembly.
6. Reinstall the spark arrestor screen snugly back into the spark
arrestor hood.
7. Reinstall the two hood tabs into the two muffler slots and flip the
spark arrestor hood closed.
8. Replace the screw you removed in Step 2 and tighten it securely.
9. Reinstall the air filter/muffler cover.
CARBURETOR ADJUSTMENT
Check Fuel Mixture
Old and/or improperly mixed fuel is usually the reason for improper unit
performance. Drain and refill the tank with fresh, properly-mixed fuel
prior to making any adjustments. Refer to Oil and Fuel Information.
Clean Air Filter
The condition of the air filter is important to the operation of the unit.
A dirty air filter will restrict air flow and change the air/fuel mixture.
This is often mistaken for an out of adjustment carburetor. Check the
condition of the air filter before adjusting the idle speed screw. Refer
to Air Filter Maintenance.
Adjust Idle Speed Screw
The idle speed of the engine is adjustable through the air filter/muffler
cover (Fig. 29). If after checking the fuel mixture and cleaning the air filter
the engine still will not idle, adjust the idle speed adjuster as follows.
1. Start the engine and let it run at the fast position for a minute to
warm up.
2. Set the blower/vacuum mode change-over lever to the up
position (Blower Mode). Refer to Operating as a Blower.
NOTE: Setting the lever to the blower mode prevents the vacuum
bag from filling up while starting or running the unit.
3. Move the throttle control and let the engine idle. If the engine stops,
insert a small phillips screwdriver into the hole in the air filter/muffler
cover (Fig. 29). Turn the idle speed adjuster in, clockwise, 1/8 of a
turn at a time (as needed) until the engine idles smoothly.
4. If the unit appears to be idling too fast, turn the idle speed
adjuster counterclockwise 1/8 of a turn at a time (as needed), to
reduce idle speed.
REFER TO
Page 3
Page 5
Page 5
Page 5
Blue Choke
Lever
Screws
Screws
Fig. 23
Air Filter
Inside Muffler Cover
Fig. 24
Fig. 25
Fig. 26
Fig. 27
Slots Engine
Spark Arrestor
Hood
Spark Arrestor
Screw
Muffler
Tabs Screen
Fig. 28
Idle Speed Screw
Fig. 29
MAINTENANCE AND REPAIR INSTRUCTIONS
Checking the fuel mixture, cleaning the air filter, and adjusting the idle speed should solve most engine problems.
If not and all of the following are true:
• the engine will not idle
• the engine hesitates or stalls on acceleration
• there is a loss of engine power
Have the carburetor adjusted by an authorized service dealer.
NOTE: Careless adjustments can seriously damage your unit. An authorized service dealer should make carburetor
adjustments.
REPLACING THE SPARK PLUG
Use spark plug #791-610311B, Champion Ref. #RDJ7Y or
equivalent. The correct air gap is 0.025 inch (0.635 mm). Remove the
plug after every 25 hours of operation and check its condition.
1. Stop the engine and allow it to cool. Grasp the plug wire firmly
and pull it from the spark plug.
2. Clean around the spark plug. Remove the spark plug from the
cylinder head by turning a 5/8-inch socket counterclockwise.
3. Replace a cracked, fouled or dirty spark plug. Set the air gap at
0.025 inch (0.635 mm) using a feeler gauge (Fig. 30).
4. Install a correctly-gapped spark plug in the cylinder head. Tighten by turning the 5/8-inch socket clockwise until snug.
If using a torque wrench torque to:
110-120 in.•lb. (12.3-13.5 N•m)
Do not over tighten.
CLEANING AND STORAGE
CLEANING THE UNIT
Use a small brush to clean off the outside of the unit. Do not use strong detergents. Household cleaners that contain
aromatic oils such as pine and lemon, and solvents such as kerosene, can damage plastic housing or handle. Wipe off
any moisture with a soft cloth.
CLEANING THE VACUUM BAG
1. Empty the bag after each use to avoid deterioration and obstructing air flow, which will reduce the performance of
the vacuum.
2. Wearing eye protection and a dust mask, clean the bag as needed. Turn the bag inside out after the initial emptying
and vigorously shake out dust and debris.
3. Wash the bag once a year or more often if needed:
a. Remove the vacuum bag.
b. Turn bag inside out.
c. Hang it up.
d. Hose it down thoroughly.
e. Hang to dry.
f. Turn bag right-side out and reinstall.
STORAGE
• Never store a fueled unit where fumes may reach an open flame or spark.
• Allow the engine to cool before storing.
• Store the unit locked up to prevent unauthorized use or damage.
• Store the unit in a dry, well-ventilated area.
• Store the unit out of the reach of children.
LONG TERM STORAGE
If you plan on storing the unit for an extended time, use the following storage procedure:
1. Drain all fuel from the fuel tank into a container with the same 2-cycle fuel mixture. Do not use fuel that has been
stored for more than 60 days. Dispose of the old fuel/oil mix in accordance with federal, state and local regulations.
2. Start the engine and allow it to run until it stalls. This ensures that all fuel has been drained from the carburetor.
3. Allow the engine to cool. Remove the spark plug and put 1 oz. (30 ml) of any high quality motor oil or 2-cycle oil
into the cylinder. Pull the starter rope slowly to distribute the oil. Reinstall the spark plug.
NOTE: Remove the spark plug and drain all of the oil from the cylinder before attempting to start the unit after storage.
4. Thoroughly clean the unit and inspect it for any loose or damaged parts. Repair or replace damaged parts and
tighten loose screws, nuts or bolts. The unit is ready for storage.
TRANSPORTING
• Allow the engine to cool before transporting.
• Drain fuel from the unit.
• Tighten the fuel cap before transporting.
• Secure the unit while transporting.
0.025 in.
(0.635 mm)
Fig. 30
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