I have tested this engine and people are silly if they sell them i ashore you will be kick your self when you see one run. The engine is wicked very fast as fast as most outher engines. I tested mine today at a club race and the engine is a shinning paformer very fast consistant relable and powerfull. It was faster then most top of the line engine such as ninja ro1 and its not far off a 35+21 in the paformance if you gear the engine right its as quick. I defnatly recamend useing it for any type of racing. Its very impressive to say the lest. Regards Jeremy.
The 35+21 is still a very good buy and worth buying and it is quicker than the Ns21p when fresh and tuned corectly it makes more power and rpm's then the ns21p. All i am trying to say is it's a quick engine looks are very deciving some times. Its well capable of winning club events and even semmi major local events. The 359 is a real step above the paformance of the 35+21. But all up the 359/ns21p package is extreamly good The ns21p gives you the chance to run it during local races and saving the 359 for world, state and country major race meets. Best Regards Jeremy.