Hi All, I have a question regarding engine size. I have seen a number of kits for these bikes ranging from 540 up to 700. How much can the bottom end handle? I know that the bottom end was over engineered but i don't want to destroy the bottom end. Also i want to keep the decomp lever attached for obvious reasons. I have three motors and two bikes, i was thinking of keeping one stock one maybe a 540 then the other maybe 600. Any advice would be apreciated.