alright..my z400 just went into the shop a 3 weeks ago... the top end needed to be rebuilt, and the cylinder walls were a little scratched up, so instead of overboreing it i decided to go ahead and put the wiesco big bore 440 in it with a high compression wiesco piston... ive never delt with any bore kits so does any one have any advice on them and am i gonna regret the bore??

 

You shouldn't really regret it. Although you will more than likely have to run race gas or else the engine won't run very well (if at all). Why did you take the quad to the shop? What are your other concerns?

 

Make sure you use the recomended octane for the set-up or your quad will be in shop again.

 

because i cant bore a cylinder lol