3.33
ENGINE
3
NOTE: A difference in end gap indicates cylinder
taper. The cylinder should be measured for
excessive taper and out of round.
3. If the bottom installed gap measurement exceeds 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 oiled rag
immediately to remove residue and prevent rust.
Crankcase Disassembly
NOTE: The recoil starter, starter motor, starter drive,
flywheel, stator, cam chain and sprockets can be
serviced with the engine in the frame.
Starter Drive Removal / 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 the thrust washer for wear or damage and replace
if necessary.
4. Measure the OD of the starter drive shaft on both ends and
record.
5. Measure the ID of the bushing in the recoil housing (A) and
in the crankcase and record. Measure in two directions 90
o
apart to determine if bushing is out of round. Calculate
bushing clearance. Replace bushing if clearance exceeds
the service limit.
6. Inspect gear teeth on starter drive. Replace starter drive if
gear teeth are cracked, worn, or broken.
Flywheel and Stator Removal / Inspection
1. Remove flywheel nut and washer.
2. Install Flywheel Puller (PN 2871043) and remove
flywheel. CAUTION: Do not thread the puller bolts into
the flywheel more than 1/4" or stator coils may be damaged.
3. Mark or note position of stator plate on crankcase.
4. Remove bolts and carefully remove stator assembly, being
careful not to damage crankshaft bushing on stator plate.
5. Replace crankshaft seal (B).
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)
A
B
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