We just had the whole lower end all rebuilt as well as a new piston/rings bored 20 over (wiesco piston and rings). To save some money i am doing some of the work myself (putting the motor back in the 4 wheeler, capping the oil pump as we are going to premix, etc). Anyway, the engine builder didn't know the answer as to the correct jetting on a motor that's 20 over. I believe right now it has the stock jet in the carb, should we be using anything different? Thanks in advance.

 

Stock jetting is fine.

 

FYI: you'll have to do a careful break in on that piston.

 

@lt80, you mentioned i need to be sure to breakin the piston. What do you recommend for that process? I've heard of breaking in a piston, but just wondering what you would say to do to successfully break it in?