Remove Carburetor
WARNING
Explosive Fuel can cause fires and severe
burns.
Do not fill fuel tank while engine is hot or
running.
Gasoline is extremely flammable and its vapors can
explode if ignited. Store gasoline only in approved
containers, in well ventilated, unoccupied buildings,
away from sparks or flames. Spilled fuel could ignite if it
comes in contact with hot parts or sparks from ignition.
Never use gasoline as a cleaning agent.
1. Disconnect fuel shut-off solenoid lead.
2. Remove throttle linkage and linkage spring from
governor lever. Reattach bushing to linkage following
separation to avoid losing it.
3. Remove carburetor, throttle linkage, and linkage
spring as an assembly.
4. Remove carburetor gasket.
5. If necessary, carburetor, throttle linkage, and linkage
spring can be separated. Reattach bushings to
linkage following separation to avoid losing them.
Remove External Governor Controls
Loosen nut and remove governor lever from cross shaft.
Remove Electric Starter Motor
1. Disconnect leads from starter.
2. Remove screws and starter assembly.
Remove Outer Baffles, Debris Screen, and Blower
Housing
1. Disconnect plug from rectifier-regulator. Use tip of
small flat tool to bend locking tang, then remove B+
terminal from center position in plug.
2. Rectifier-regulator does not have to be detached
from blower housing.
3. Remove screws securing outer baffles. Note location
of any lifting strap and position of short screws (one
each side on bottom) for reassembly.
4. Remove outer baffles.
5. Remove fixed guard from blower housing. If flywheel
screen overlaps blower housing, remove fasteners
and screen. If it is a metal debris screen with long
bolts, also remove remaining loose hardware.
Remove spacers, paying attention to curvature of
spring washers between spacers and fan.
6. Remove remaining screws securing blower housing.
Note 1 green plated screw used for rectifier-regulator
ground strap or lead. Oil separator can remain on
blower housing but remove from valve cover.
Remove blower housing.
7. Remove cooling fan.
Remove Oil Sentry
™
1. Disconnect lead from Oil Sentry
™
switch.
2. Remove Oil Sentry
™
switch from breather cover.
Remove Inner Baffle and Breather Cover
1. Remove screws securing inner baffle to crankcase.
2. Remove inner (valley) baffle.
3. Remove remaining screws from breather cover.
4. Remove breather cover and gasket.
Crankcase Breather System
Breather system is designed to control amount of oil
in head area and still maintain necessary vacuum in
crankcase.
A spring steel reed and stop is mounted on each bank
of crankcase, between lifter bores. When pistons move
downward, air is pushed past reeds into cylinder head
cavities. On cylinder 2, upper end of head is completely
sealed by rocker cover, so a low, positive pressure is
created in head cavity. Cylinder 1 rocker cover has
a hole in it for venting. Bottom nipple of oil separator
canister is fitted into hole with a grommet. From top
nipple of canister, a breather hose goes back to air
cleaner base. Air moving into cylinder 1 head cavity is
filtered through oil separator and then is drawn into air
intake.
Upward travel of pistons closes reeds and creates
a low vacuum in lower crankcase. A combination of
low pressure above and low vacuum below forces
any accumulated oil out of cylinder 2 head area into
crankcase. On cylinder 1 bank you have atmospheric
pressure above and vacuum below, again drawing any
oil toward crankcase.
Remove Valve Covers
1. Remove screws securing each valve cover. Note
valve cover differences for proper location in
reassembly.
2. Remove valve covers and O-rings.
Remove Ignition Modules
1. Disconnect lead from each ignition module.
2. Rotate flywheel so magnet is away from modules.
3. Remove mounting screws and ignition modules.
Note position of ignition modules.
Remove Spark Plugs
Remove spark plug from each cylinder head.
Disassembly/Inspection and Service
43
24 690 37 Rev. B
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