The RB20 Kit is made up of a 66mm cylinder, a two ring piston kit, an inlet manifold, a dual reed block assembly, and a top end gasket set and cylinder head.

This 200cc cylinder kit is intended to be fitted to the 125cc, 150cc, 175cc crankcase. Offering dramatically improved performance over the standard. This engine is very smooth and free reving making it easy to put the power down.

The Rb20 gives the highest level of performance using the small crankcase.