Sorry been a very busy weekend, but thanks everyone for the input... Thanks for the response Neil I surely appreciate your very knowledgeable information... I surely don't have the deep pockets and that's the main reason I wanted cpi cylinder, and a bulletproof bottom end... From my research esr, and pro x have water jacket issues, so instead of chasing gremlins down with there products and putting new top ends on, etc itd seem the logical thinking would be build it right the first time or waste alot of money wishing you had.... I could be wrong and maybe esr, pro x have there issues figured out and would appreciate input in that area... With that said I'm strongly concerned with the transmission situation as being my weakest link in the build, hopefully we have some good aftermarket ones in the near future... My main reason for going sphynx over puma was the transmission reliability... I'm lookin for a strong 65hp and would like to believe I could do that without destroying gears... I look forward to all the information I can get... Thanks again