| Name | Brand | Type |
|---|---|---|
| AA - AIR CLEANER GROUP | STH | assembly |
| AB - BLOWER HOUSING GROUP | STH | assembly |
| AC - CARBURETOR GROUP | STH | assembly |
| AD - CONTROLS GROUP | STH | assembly |
| AE - CRANKCASE COVER/SUMP GROUP | STH | assembly |
| AF - CRANKSHAFT GROUP | STH | assembly |
| AG - CYLINDER GROUP | STH | assembly |
| AH - CYLINDER HEAD GROUP | STH | assembly |
| AI - EXHAUST GROUP | STH | assembly |
| AJ - FLYWHEEL/IGNITION/STARTER GROUP | STH | assembly |
| AK - FUEL SUPPLY GROUP | STH | assembly |
| AM - Shortblock | STH | assembly |