OS-13612 O.S. Engine 21RG-X (P) High-Rev Pull-Start Nitro Engine  [OS-13612]

What the O.S. Engine 21RG-X (P) Delivers on Track

The O.S. Engine 21RG-X (P) delivers a mix of high rpm capability and usable midrange torque for 1/8 scale nitro buggies. The pull-start version keeps things simple when getting underway and lowers barriers for new nitro drivers.

Core Specifications and Rev Characteristics

This unit carries a 3.46cc displacement and is rated at 1.9 BHP at 30,000 RPM, with a practical operating window from 3,000 to 32,000 RPM. The result is a powerband that can cope with long straights and still provide controllable acceleration out of corners.

Chassis Compatibility and Installation Notes

Originally matched to several Kyosho 1/8 scale models, the 21RG-X (P) can be adapted to other frames using basic mounting tweaks. The pilot shaft crankshaft simplifies alignment and reduces fitment headaches.

Running Tips for Consistent Performance

Use a reputable nitro fuel and check your carburetor needles for track-specific tuning. Swap the glow plug periodically to maintain consistent ignition and avoid rough running during heats.

The O.S. Engine 21RG-X (P) suits racers and weekend tuners who want a compact, high-revving powerplant with easy starting and solid midrange response.