starved for power

[400exrider_88]

got my 426 together and it runs but will not run right. i know the timing is right, but it will cut out at about 3/4 throttle. any suggestions? its also a 11:1 hig comp. piston, i was using 87 not 110 race fuel. it did this before i rebuilt the top too

change your jetting? and wait you were using 87 octane? I wont even run that with stock compression

[the Z Man]

I would say fuel related, jetting, open the air box up and throw in alot of fuel.

[ridinga400ex]

yeah,,if you changed the bore you should also address the jetting(go with stage 2),pipe,and filter(air box lid off or with holes)..good luck

[Honda#4]

Whats your current jetting at? I'd say up the main a few sizes.