ENGINE
3.31
PISTON RING INSTALLED
GAP
1. Placeeach pistonringinsidecylinderusingpiston
to push ringsquarely into place as shown at right.
25-50mm
Cylinder
Piston Ring
Feeler Gauge
Piston Ring Installed Gap
Top Ring
Std: .0079-.0138I (.20- .36 mm)
Limit: .039I (1.0 mm)
Second Ring
Std: .0079-.0138I (.20- .36 mm)
Limit: .039I (1.0 mm)
Oil Ring
Std: .0079-.0276I (.20- .70 mm)
Limit: .059I (1.5 mm)
2. Measure installed gap witha feelergauge at both
the top and bottom of the cylinder. NOTE: A
difference in end gap indicates cylinder taper.
The cylinder should be measured for excessive
taper and out of round.
3. Ifthebottominstalledgapmeasurementexceeds
the service limit, replace the rings. If ring gap is
below specified limit, file ring ends until gap is
within specified range.
NOTE: Always check piston ring installed gap after
re-boring a cylinder or when installing new rings. A
re-bored cylinder should always be scrubbed
thoroughly with hot soapy water, rinsed, and dried
completely. Wipe cylinder bore with an oil rag
immediately to remove residue and prevent rust.
CRANKCASE DISASSEMBLY
NOTE: Therecoilstarter,startermotor, starterdrive,
flywheel, stator , cam chain and sprockets can be
serviced with the engine in the frame.
STARTER DRIVE
REMOV
AL/INSPECTION
1. Remove recoil housing bolts and remove
housing.
2. Remove starter drive assembly. Note the thrust
washer located at the rear of the drive
mechanism.
3. Inspect thethrustwasherforwearordamageand
replace if necessary.
A
Std. Bushing ID:
.4735″- .4740″ (11.11-12.04 mm)
Std. Shaft OD:
.470″- .472″ (11.93-11.99 mm)
Starter Drive Bushing Clearance:
Std: .0015″-.004″ (.038-.102 mm)
Service Limit:
.008″ (.203 mm)
4. Measure the ODof thestarter driveshaft on both
ends and record.
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