Parts Diagram | ## | Part # | Description | Qty | Notes |
| 1 | 0306049 | Screw, crankcase head upper | 4 | |
2 | 0308742 | Screw, crankcase head | 8 | |
3 | 0387432 | Crankcase head and bearing. assembly | 1 | |
4 | 0322575 | Seal, upper | 1 | |
5 | 0317831 | Retaining ring | 12 | |
6 | 0305123 | O-ring | 4 | |
7 | 0307480 | Key, flywheel | 1 | |
8 | 0388306 | Crank shaft assembly | 1 | |
9 | 0319244 | Seal ring, one strip. 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, 4 white stripes. these seal rings are gauge fitted, replace according to stripe code | | |
10 | 0317762 | Plate, lower 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 st | 2 | |
16 | 0308213 | Ring, retaining, bearing | 1 | |
17 | 0388595 | Bearing, wrist pin | 6 | |
18 | 0387831 | Connecting rod assembly | 6 | |
19 | 0308186 | Screw, rod cap | 2 | |
20 | 0390824 | Retainer set | 6 | |
21 | 0320499 | Split sleeve, center bearing | 2 | |
22 | 0385661 | Ring set, Std. 150, 175, 200 | 6 | |
22 | 0385662 | Ring set, .020 0. s.150, 175, 200 | 6 | |
22 | 0385663 | Ring set, .030 o. s.150, 175, 200 | 6 | |
22 | 0390509 | Ring set, Std.235 | 6 | |
22 | 0390510 | Ring set, .030, 235 | 6 | |
23 | 0390981 | Piston, Std.150, 175, 200 | 6 | |
23 | 0390982 | Piston, .020 o. s. 150, 175, 200 | 6 | |
23 | 0390983 | Piston, .030 o. s.150, 175, 200 | 6 | |
23 | 0392022 | Piston, Std.235 | 6 | |
23 | 0390511 | Piston, .030, 235 | 6 | |
24 | 0327861 | Wrist pin | 6 | |
25 | 0326439 | Clamp, retainer to crankcase head | 4 | |