Middle Gear; Bearings And Oil Seals; Circlips And Washers; Crankcase - Yamaha YFM250XL(C) Service Manual

INSPECTION AND REPAIR

MIDDLE GEAR

1.Inspect:
Middle driven pinion gear 1
Bearing 2
Middle driven shaft 3
Reverse gear 4
Bearing housing 5
Damage/Wear → Replace.
2.Check:
Bearing movement
Turns roughly → Replace.
NOTE:
When the driven pinion gear, reverse gear,
middle driven shaft and/or bearing housing
are replaced, be sure to adjust the middle
gear shim(s).
Refer to the "DRIVE TRAIN-MIDDLE GEAR
SERVICE" section in CHAPTER 6.

BEARINGS AND OIL SEALS

1.Inspect:
Bearings
Pitting/Damage → Replace.
2.Inspect:
Oil seals
Damage/Wear → Replace.

CIRCLIPS AND WASHERS

1.Inspect:
Circlips
Washers
Damage/Looseness/Bends → Replace.

CRANKCASE

1.Thoroughly wash the case halves in mild
solvent.
2.Clean all the gasket mating surfaces and
crankcase mating surfaces thoroughly.
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