Cleaning And Inspecting Flywheels

1. Wash all parts in grease solvent and blow dry with compressed air. Examine crank pin for wear, grooving and pitting. If the surface is at all worn, replace with new pin. Examine flywheel washers (23 and 24). If either washer is worn and grooved, it should be replaced.

2. Examine connecting rod lower races. If they appear slightly grooved or shouldered where edge of bearing rollers ride, they may be lapped out and oversize bearing rollers installed. If they appear badly worn, grooved or pitted, new rods should be installed, preferably as an assembly with new bearings and crank pin.

3. Examine pinion shaft and right crankcase bearing race (see 17, Figure 3-36) for pitting, grooving and gouging at point where right main roller bearings ride. A shaft that is worn must be replaced. If bushing is worn beyond repair, replace as described in "Truing and Sizing Pinion Shaft Main Bearing."

1. Right crankcase half

2. Spiral lock ring

3. Bearing washer (2)

4. Bearings and retainer

5. Bearing washer (see item 3)

6. Sprocket shaft spacer

7. Sprocket shaft bearing seal

8. Flywheel and rod assembly

9. Sprocket bearing half 10. Bearing inner spacer

11. Bearing outer race

12. Outer race snap ring

13. Bearing outer race

14. Left crankcase half

15. Sprocket bearing half

16. Pinion shaft bearing race lock screw (2)

17. Pinion shaft bearing race

NOTE: Keep parts 9, 10, 11, 12, 13 and 15 as a set. Do not transpose or interchange parts.

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