yea it works good on my stock bore good power can put around the trails mine doesnt do so well real slow cause its jetted fat for safety on topend... its a two stroke its aspost to be reving not meant to be slow..
they make a non label, light weight aluminum for racing, those are the weakest but supper light...blue lable is average grade... and red label are the expensive ones..suppose to be the strongest...as far as i know