Best 426ex Combo

[mrnate400ex]

I am thinking of rebuilding my 400ex to a 426. What compression, cam, and other mods have you done? Why is your setup the best?? And, if you have had it dynoed what did it rate hp and torque??

[spud400ex]

ive got 11:1 426 piston and stage one hotcam with mine. not sure how fast it is yet since i put it back together sunday. we are hopin to get 40 horse out of it after gettin a carb on it. its got the same porting and cam as my dads 440 which is puttin out 40.4 with a keihin 39mm fcr carb. we also did the porting on both quads.

[ride_red666]

spud400ex how come u went with the stage 1 hotcam, arent they made for stock engines. i think the stage 2 or 3 would have been a much better choice since they are made to go with modified bores or strokes.

[400EX QUADER]

i'll sell ya a stock yfz carb... aka a fcr 39mm.;) works great on a 400ex.:D

[spud400ex]

Originally posted by ride_red666
spud400ex how come u went with the stage 1 hotcam, arent they made for stock engines. i think the stage 2 or 3 would have been a much better choice since they are made to go with modified bores or strokes.

i put the cam in last year with just a 10:1 standard bore piston and it did alright. but when i went with the big bore i didnt have the money for a different cam so i stuck with what i had. i will be getting a hotter cam in the next month or two tho. not sure what tho.

[underpowered]

11:1 JE piston, WB all aorund cam (Soon to get a stage 3 hotcam), choke removed, HMF pipe. Runs great, the cam is a great woods cam, power everywhere. just changeing cams to try something different.

[mrnate400ex]

let me know how that stage 3 works out. from what i hear, the stage 3 is the old stage 2 and the stage 2 is a little more aggressive than the stage 1 and less aggressive than the stage 3. that is just what i thought i may have read somewhere.