i guess we can just throw all the physics out the window because you say that the parts are not made. venolia will make a custom piston (have to buy 10 at $100) to fit ANYTHING and you can specify the weight. manely will make you ANY valve you want. you said mods cant make higher rpms and i say they can. i did not say you could go to dennis kirk and pick up a 1000 rpms. race bikes are made to spin spin spin and that is where the power is. i would also bet probe would build you a nice custom h beam rod that could handle the power. i did mean to say lighter VALVES not springs. that was a mistake on my part. ligher springs would float the valves and make contact with a piston.
on a side note. i dont see why anyone would spend $1000's to modify a 350x when a stock 250r will still smoke it??? you MAY be able to make a 350x keep up but put half that $$$$ into a R and you will be screaming.



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