thought you honda guys might like this,psi just came out with three genesis big bore kits for the 250r,they have a 265 kit that makes 60hp,a 330 kit that makes 65hp,and a 425 kit that makes 70hp.you get a complete new top end with reeds,intake,exhuast,gaskets.
and the head is the dial a dome so you can adjust the comp.ratio,the only kit that requires a case mod is the 425 kit,reliability should be good theyve been making 990 polaris twins with 215hp,and 1500 triples with 311hp for years.price on the kits are 2600.00 for the 265 and 330 kit and the 425 kit costs 2850.00, just remember 70hp and it wont feel so bad.they also have some new carbs out that look killer,there big air atv carbs,they have a triangled bore so at low throttel openings it flows like a 32mm and wide open it flows like a 40mm,plus no jetting its full external adjustments,they make them for 2 and 4 strokes.they also have a 30/38 carb to.i think i might have to big bore my raptor to 724cc and get a set of psi carbs with bolt on kits like this out there. psi web page is psiperformance.com