This owner's instruction manual for the O.S. Engines MAX-21RG Series covers safety instructions and warnings, basic engine parts, engine and carburetor installation, the Type 201 air cleaner, starting and running-in, final adjustment, carburetor cleanliness, and care and maintenance.
The text states that the MAX-21RG Series was developed for 1/8 scale off-road buggy and scale cars. The MAX-21RG uses a conventional crankshaft; the MAX-21RG(P) uses a special crankshaft with integral pilot shaft. The MAX-21RG-X and MAX-21RG(P)-X add a built-in O.S. recoil starting system, removing the need for a separate electric starter and battery.
| Intended use | Model cars |
|---|---|
| Recommended engine mounting screws | 3 mm or 4-40 steel Allen hexagon socket type |
| Starter cord maximum extension | 45 cm (18 in.) |
| Air cleaner | Type 201 heavy-duty wet type |
| Mount spacer screws | M3x15 |
The series was developed for 1/8 scale off-road buggy and scale cars.
Do not extend it more than 45 cm (18 in.); allow it to rewind smoothly while holding the handle.
Replace the filter element after each hour of running time.
Install the supplied engine mount spacers between the engine’s mounting lugs and the engine mount.