Parts Diagram | ## | Part # | Description | Qty | Notes |
| 1 | 0307028 | Screw, crankcase head upper | 4 | |
2 | 0309924 | Screw, crankcase head | 8 | |
3 | 0387432 | Crankcase head and bearing assembly | 1 | |
4 | 0322575 | Seal, upper | 1 | |
5 | 0317831 | Retaining ring | 8 | |
6 | 0305123 | O-ring | 4 | |
7 | 0307480 | Key, flywheel | 1 | |
8 | 0389599 | Crank shaft assembly | 1 | |
9 | 0319244 | Seal ring, one stripe. these seal rings are gauge fitted, replace according to stripe code | | |
9 | 0319250 | Seal ring, two stripes. these seal rings are gauge fitted, replace according to stripe code | | |
9 | 0319197 | Seal ring, three stripes. these seal rings are gauge fitted, replace according to stripe code | | |
9 | 0324817 | Seal ring, four white stripes. these seal rings are gauge fitted, replace according to stripe code | | |
10 | 0317762 | Plate, lowering bearing | 1 | |
11 | 0385503 | Bearing, ball | 1 | |
12 | 0385502 | Crankcase head assembly | 1 | |
13 | 0321668 | Seal | 1 | |
14 | 0317763 | Screw, plate | 4 | |
15 | 0387041 | Retainer & needle set | 1 | |
16 | 0308213 | Ring, retaining, bearing | 1 | |
17 | 0388595 | Bearing, wrist pin | 4 | |
18 | 0320499 | Split sleeve, center bearing | 1 | |
19 | 0387787 | Retainer set | 4 | |
20 | 0385661 | Ring set, Std | 4 | |
20 | 0385662 | Ring set, .020 o. s | 4 | |
20 | 0385663 | Ring set, .030 o. s | 4 | |
21 | 0390981 | Piston, Std | 4 | |
21 | 0390982 | Piston, .020 o. s | 4 | |
21 | 0390983 | Piston, .030 o. s | 4 | |
22 | 0327861 | Wrist pin | 4 | |
23 | 0393754 | Connecting rod assembly | 4 | |
24 | 0308186 | Screw, rod cap | 2 | |