| pos. | decription | spare part number | |
| 1 | Cylinder Assembly | 490450 |
| 2 | Bearing-Cylinder Note: Installation Requires Special Tools | 399265 |
| 3 | Seal-Oil | 391086 |
| 5 | Head-Cylinder | 494240 |
| 6 | Washer-Flat | 22963 |
| 7 | Gasket-Cylinder Head | 271866 |
| 8 | Breather Assembly | 391406 |
| 9 | Gasket-Valve Cover | 27803 |
| 10 | Screw | 94621 |
| 11 | Tube-Breather | 280100 |
| Gasket-Crkcse Cover, .005 Thick * Included in Gasket Set Part No. 494241. | 271997 |
| Gasket-Crkcse Cover, .009 Thick * Included in Gasket Set Part No. 494241. | 271996 |
| 13 | Terminal-Spade | 93722 |
| 14 | Stud-Cylinder Head | 93781 |
| 15 | Plug-Oil Drain | 94239 |
| 16 | Crankshaft Note: 94196 Key-Timing Gear | 490466 |
| 18 | Base-Engine | 494238 |
| 20 | Seal-Oil | 291675 |
| 22 | Screw-Base Mtg. Sem | 94624 |
| 24 | Key-Flywheel | 222698 |
| 25 | Piston Assy.-Standard | 394661 |
| 26 | Ring Set-Piston-Standard | 391780 |
| Ring Set-Piston-.010 O.S. | 391781 |
| 27 | Lock-Piston Pin | 260924 |
| 28 | Pin Assembly-Piston-Standard | 299691 |
| 29 | Connecting Rod Assy. Note: For Connecting Rod with .020 Undersize Crankpin Bore-Order No.490469. | 490348 |
| 31 | Lock-Connecting Rod Screw | 222299 |
| 32 | Screw-Connecting Rod | 92909 |
| 33 | Valve-Exhaust | 262246 |
| 34 | Valve-Intake | 262247 |
| 35 | Spring-Intake Valve | 65906 |
| 36 | Spring-Exhaust Valve | 26828 |
| 37 | Guard-Flywheel | 232752 |
| 40 | Retainer-Intake Valve | 221596 |
| 41 | Rotocoil-Exhaust Valve | 292260 |
| 42 | Retainer-Exhaust Valve Rotocoil | 93630 |
| 45 | Tappet-Valve | 262248 |
| 46 | Gear-Cam | 212897 |
| 201 | Link-Governor | 262767 |
| 219 | Oil Slinger | 490815 |
| 222 | Plate-Governor Control | 494041 |
| 225 | Crank-Governor | 231058 |
| 227 | Lever Assy.-Governor | 493935 |
| 230 | Washer-Gov. Crank | 222450 |
| 232 | Spring-Governor Link | 262785 |
| 265 | Spring-Governor Link | 262785 |
| 284 | Screw-Clamp Mtg. | 946920 |
| 304 | Housing-Blower | 494269 |
| 305 | Screw-Blower Housing Sem | 94619 |
| 306 | Shield-Cylinder | 224545 |
| 307 | Screw-Cylinder Shield Mtg. Sem | 94623 |
| 308 | Cover-Cylinder Head | 491490 |
| 337 | Plug-Spark (Resistor Type-1-7/8 high, 47 M.M.)(Model No. 38566 only) | 802592 |
| 346 | Screw-Sem | 93705 |
| 353 | Washer-Lock-Shakeproof | 92791 |
| 354 | Nut-Hex.-8-32 | 90576 |
| 358 | Gasket Set | 9494241 |
| 383 | Wrench-Spark Plug | 89838 |
| 422 | Clamp-Oil Filler Tube | 223390 |
| 520 | Terminal-Spade | 93722 |
| 523 | Cap and Dipstick-Oil Filler | 490327 |
| 524 | Seal-Filler Tube | 68838 |
| 525 | Tube-Oil Filler | 280741 |
| 552 | Bushing-Gov. Crank | 231597 |
| 562 | Bolt, Governor Lever | 92613 |
| 592 | Nut-Hex.-10-24 | 231082 |
| 614 | Cotter, Hair Pin | 93306 |
| 615 | Retainer, E-Ring | 93307 |
| 634 | Seal-Oil | 491323 |
| 635 | Elbow-Spark Plug | 66538 |
| 657 | Screw, Sem | 93496 |
| 741 | Gear-Timing | 262135 |
| 757 | Link-Counterweight | 212359 |
| 758 | Counterweight Assy. | 399891 |
| 759 | Pin Assy., Piston, Std. | 298909 |
| 761 | Screw-Counterweight | 93875 |
| 842 | Seal-Oil Filler Cap | 270920 |
| 847 | Cam, Dog | 490474 |
| 869 | Seat-Intake Valve (Standard) | 261463 |
| 870 | Seat-Exhaust Valve(Standard) | 210940 |
| 871 | Guide-Exhaust Valve Note: 231218 Guide-Exhaust on Intake Valve (Brass). See Repair Manual. | 261961 |
| 985 | Insulator Assembly | 398525 |
| 1020 | Eccentric | 261243 |
| 1021 | Pin-Eccentric | 94160 |
