This is a maintenance manual for O.S. 1/8 off-road truck (Truggy) racing competitions engine
This manual provides comprehensive instructions for the O.S. MAX-25XZ, a high-performance .25 cu.in. engine specifically designed for 1/8 scale radio-controlled truggy racing. It covers safety warnings, engine construction details, and the installation of standard accessories like the P3 glow plug and 21JN carburetor.
The guide details the complete operating procedure, including starting the engine, running-in (break-in) procedures, and final adjustments. It also includes troubleshooting advice, maintenance tips, and exploded views with parts lists for both the engine and carburetor.
| Displacement | .25 cu.in. |
|---|---|
| Scale Application | 1/8 scale |
| Carburetor Type | 21JN |
| Glow Plug Type | P3 T-type head |
| Fuel Nitromethane Content | 10-30% |
It is expressly designed for 1/8 scale radio-controlled truck type (Truggy) cars racing competitions.
Remove the glowplug, close the needle-valve, and apply the starter to pump out surplus fuel while covering the head with a rag.