| Fig. | Item # | Hodaka Part # | Description | Amt. |
| B | 1 | 901001 | Crankcase assembly (left and right) | 1 |
| B | 1-1 | 901011 | Main shaft bushing | 1 |
| B | 1-2 | 901004 | Counter shah bushing | 1 |
| B | 2 | (46)0640 | Crank case setting screw | 3 |
| B | 3 | (46)0645 | Crank case setting screw | 8 |
| B | 4 | 901008 | Crank case alignment dowel (large) | 1 |
| B | 5 | 901009 | Crank case alignment dowel (small) | 1 |
| B | 6 | BB6204 | Bearing | 3 |
| B | 7 | 901010 | Crank shaft oil seal (L) | 1 |
| B | 8 | 901003 | Crank shaft oil seal (right) | 1 |
| B | 9 | (91)470175 | Crank shaft thrust snap ring | 1 |
| B | 10 | BB6203 | Bearing | 1 |
| B | 11 | (91)470175 | Main shaft snap ring | 1 |
| B | 14 | 901012 | Counter shaft oil seal | 1 |
| B | 15 | (10)0812 | Drain plug | 1 |
| B | 16 | 901020 | Drain plug gasket | 1 |
| B | 17 | 901002 | Cylinder stud bolt (M7) | 4 |
| B | 18A | 901013A | Breather | 1 |
| B | 23 | 902700 | Crank shaft assembly (23-1/23-8) | 1 |
| B | 23-1 | 902701 | Crank shaft (magneto side) | 1 |
| B | 23-2 | 902702 | Crank shaft (clutch side) | 1 |
| B | 23-3 | 902710 | Connecting rod | 1 |
| B | 23-4 | 902712 | Connecting rod bushing (small end) | 1 |
| B | 23-5 | 902703 | Crank pin (call for sizing) | 1 |
| B | 23-6 | 902709 | Bearing - needle bearing (large end) | 1 |
| B | 23-8 | 902705 | Crank pin thrust washer | 2 |
| B | 24 | 902714 | Crank shaft washer (L) | 1 |
| B | 25 | 902713 | Crank shaft key (L) | 1 |
| B | 26 | 903001 | Flywheel nut (M10) | 1 |
| B | 27 | (63)10025 | Flywheel setting spring washer | 1 |
| B | 28 | 481200 | Piston assembly (standard) - Piston, rings, wrist pin & snap rings | 1 |
| B | 28-1 | 481220 | Piston assembly (.020 over) - Piston, rings, wrist pin & snap rings | 1 |
| B | 28-2 | 481240 | Piston assembly (.040 over) - Piston, rings, wrist pin & snap rings | 1 |
| B | 31 | 902707 | Piston wrist pin | 1 |
| B | 32 | 902708 | Piston pin snap ring | 2 |
| B | 33 | 904020 | Clutch disc | 1 |
| B | 34 | 90402502 | Clutch disc spacer t=0.2mm | 1 |
| B | 34 | 90402503 | Clutch disc spacer t=0.3mm | 1 |
| B | 34 | 90402505 | Clutch disc spacer t=0.5mm | 1 |
| B | 35 | 904014 | Crank shaft nut (left hand thread, M12) | 1 |
| B | 36 | 904013 | Crank shaft lock washer | 1 |
| B | 37 | 904000 | Clutch assembly (37-1/37-12) | 1 |
| B | 37-1 | 904008 | Clutch cover | 1 |
| B | 37-2 | 904011 | Clutch spring | 6 |
| B | 37-3 | 904012 | Clutch hub | 1 |
| B | 37-4 | 904015 | Clutch thrust washer outside | 1 |
| B | 37-5 | 904006 | Clutch friction disc | 3 |
| B | 37-6 | 904007 | Clutch plate | 2 |
| B | 37-7 | 904004 | Clutch cage | 1 |
| B | 37-8 | 904005 | Clutch cage cover | 1 |
| B | 37-9 | 904009 | Clutch flathead screw (M5) | 6 |
| B | 37-10 | 924010 | Clutch safety wire | 1 |
| B | 37-11 | 904002 | Clutch rotor gear | 1 |
| B | 37-12 | 904017 | Clutch inner spring | 6 |
| B | 38 | 904001 | Clutch pinion gear | 1 |
| B | 39 | 904003 | Clutch pinion bushing | 1 |
| B | 40 | 904016 | Clutch thrust washer inside | 1 |
| B | 41 | Screw Set 2 Model 90 | Screw set - crank case | 1 |