Want more power out of my 400. Thinking about having a high compression piston put in either stock bore or 416 or 426. Also a web 450/451 grind does anyone know if you have to have hard faced rocker arms for the web cam? What is the best bore for a 400ex even you think it is the 440 I want to know or Is it best just to stay with the stock bore and then just bump up the compression? Any help would be great.
Thanks Teamtraxxx

2000 400ex Power core IV 2 S/A, Power Bomb header, works triple rate, ultra cross, power star grooved fronts, TMM subframe, Comp TMM seat latch, Dg front bumper, Dg subframe guards, Ac nerfs,Ac skid plates, renthal bars, pro Design kill switch, Uni, White Brothers seat cover, Red Frame.

 

if you plan on doing alot of woods riding a 440 would be the best, but its also the most expensive. I have rode a 426 and was impressed.
never rode 400 or 416 with high comp so dont know how they would compare.if you want it to rev higher stay small 400 or 416. if you want more torque go with larger 426 or 440.

 

i'm not so sure of that my 440 wil hit the rev limiter in all five gears with stock gearing. Is smaller better????