I just bought a 86 trx250r I read that maken it a 270 you can get 60 hp out of it what all do I have to do to it.

 

A gain of 5HP tops with no other mods other than jetting is much more realistic.

 

i see a lot of people with the esr 330 kit on trx/atc 250r

: Eddie Sanders Racing

 

All depends what terrain ya riding, I was thinking about doing a 330 kit but a buddy of my friend did one and its a little to much for the woods around New England. The 310 would be nice for woods, 330 for dunes maybe?