It is hard to under stand what you are talking about,but I dont think it would be safe either way..
fatcaaat said:If you are trying to put that on the engine I sold you the bolt pattern won't be the same. If you have another engine, you can purchase the exact same kit with the same piston only in 13mm already.
http://www.hondatrailbikes.com/catalog/product_info.php?cPath=56&products_id=841 This is a 56mm bore but I do remember that someone said they had them in 57mm now too.
boonacka said:So are there any bore kits for the motor you sold me? or should i just run a high compression piston and leave the stock bore alone?
I think i'll just do that with the TB411 cam and a bigger carb.