OS Engines Speed R2105 .21 On Road Engine with EFRA2165 Pipe and MR02 Manifold, No Longer Available

SKU: OSM1D901

The O.S. Speed R2105 Engine is a factory-tuned engine developed for 1/8 racing competitions. It is based on its predecessor, the R2104 engine, and has been further improved to have an easy-to-handle feeling that can be used on any course.

This combo set includes the EFRA2165 pipe
Based on the R2104 engine with improvements
Performance is improved by adopting a new mould of the crankcase
By changing the crankshaft, the counterweight from φ4 to φ4.5 and optimizing the weight balance, the feeling in the mid-low speed range is improved
Cylinder liner adopts 9 ports that have a good reputation in R2104. The shape has been changed to match the new crankcase
Outerhead has been changed from conventional black colour to polished silver with clear coating
Cover plate - a well-established thrust plate, the same as that of B2104 is adopted