O.S. Speed .91 piston

Inner Diameter: .375 in(9.5mm)Outer Diameter: .875 in(22.2mm)Width: .280 in(7.1mm) OS Front Bearing    This Part Is Compatible With  40 SF  40 SF ABC  40 SF-S ABC 40 VF ABC  40...

Rear Bearing for 105HZ-R as well as 91 speed, .61 SX-H, RX- H, SX-HG, RX-HGL, SX-HGL.  FEATURES Made of hardened steel.It is not a sealed bearing.It has a phenolic bearing...

This is the Connecting Rod for the OS Max 91SX-H C-Spec engine.This part connects the crankshaft to the piston. Also fits the 105 HZ-R

CRANKCASE 105HZ

This is the Cylinder Liner for the O.S. Engines 105HZ Helicopter Engine. Ring Piston

The O.S. 8 glow plug is the most widely used O.S. glow plug.Recommended for most current O.S. (and other brands of) 2-stroke RC engines.       FEATURES Medium heat...