I have an 87 TRX250R & was wanting to puchase a 265cc Duncan racing PC2000 265cc powervalve cylinder kit with cool head? I just want to be able to pull on some local 450r's at the track. Would the 265cc be enough? How about a 310 fully ported ESR kit?

 

I have an 89 TRX250r built by www.1dirracing.com that smokes 450Rs with a built stock top end. Its got an aggressive MX port job from 1 Dir Racing, 5mm base plate spacer, 1 Dir Racing long rod, 1 Dir Racing true hemi cool head, 1 Dir Racing G-3 reed valve, 1 Dir Racing riffled Keihin 39mm Air Stryker carb, K&N filter with outter wear, irridium plug, running 200 psi of compression, an oversized PWR radiator, Paul Turner High rev pipe, and I run it on TRICK 110 mixed with Amsoil Dominator at a 40:1 ratio. 1 Dir Racing also ceramic coated my cylinder and piston which keeps this puppy running very cool no matter how hard I beat on it.

Heres a couple of pics.







www.1dirracing.com also sells big bores too. From what ive seen, I wouldnt want to race one of their big bore kits lol. And I beat 450Rs, YFZ450s, and Raptor 700s on the stock bore motor that they built me. Check em out you just might like what you see.