Matt@TYGA wrote:The NSR150RR has different cylinder/piston and head combination. The cylinder is no where near as aggressively ported as the SP version. Thankfully though the SP cylinder just bolts on

There may be some other differences but not sure at this point.

Hi Matt,

Just out of interest, as I`ve just got a 300 kit, which cylinders are used for this set-up?
Obviuosly if it`s the rr ones, I`m wondering if the engine would be able to cope with sp spec porting without needing rebuilding every five minutes.