The RB20 Kit is made up of a 66mm cylinder, a two ring vertex piston kit, an inlet manifold, a dual reed block assembly, and a top end gasket set.
This 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 and exhilarating to ride. This is the highest level of performance we offer using the small crankcase. This kit will need a number of other main engine components changing in order to allow it to work and remain reliable.