I am trying to the rebuild the engine on a yamaha blaster but i dont know which crankshaft or piston to get. I've been looking online and i saw the vitos +3 stroker. does anyone know if those are any good?
I am also looking to get my cylinder bored but im not sure how much i should bore over, i dont really care about having to replace the cylinder sleeve in the future. How much is the maximum i should bore over? what size and which set of pistons should i get for it? thanks

 

I would do the stroker kit before boring if you are looking for more performance. The +3 stroker is going to be a bigger benefit than a bigger bore on a stock sleeve. I would just bore to the next oversize and call it good, unless you want to go all out with with a big bore kit.

 

depends on how far you wanna take it, you could just bore it .020 over and get a wiseco piston to match the bore then get the crank rebuilt, or get a Vitos or Hotrods crank replacement, or you could also get a 240 kit or something, no sense in boring it way more then it needs unless your not worried about the life of the stock sleeve, im not sure how much overbore those stock sleeves can take, .080 over i think, either way if you really wanna get it to fly get some porting done, best bang for the buck, a 240 kit plus porting and a decent pipe will make it haul a$$.

 

what do you mean by porting?