what is the best engine kit that will put out alot of power but will wont sacrafice the reliability of my raptor?

 

you can build tremendous power on your stock bore..... 66hp to be exact. but for ultimate reliabilty stock is the best way. but then if you want some power get a well built 686, by a reputable builder, it will put you in the 61 - 64hp range with stock carbs. Stay out of the 700cc range and the stroker cranks for relibilty.