Cylinder uppgrade

I want uppgrade my YZ400F 1998 to 450cc or 500cc.

Does anyone knows if thats possible?

Which company sells the cylinder?

Can i fit a 426 cylinder on my bike?

/Jörgen

Its alot of work and a fair amount of cash but you can use a 426 cylinder with a 2mm overbore and a 2mm stroker I recommend powroll, this will bump you up to a 467 some where in there I forget, but its killer not all that reliable though.

You could probably get a 426 cylinder that is overbored for cheap from one of the quad guys makes it a 440 I bought mine for 100.00 bucks put a post on atvscene.com

I want uppgrade my YZ400F 1998 to 450cc or 500cc.

Does anyone knows if thats possible?

You can use a 2mm overbored 426 barrel and 97mm piston (Wiseco or JE) to get 444cc. You will need to rebuild the crank with a 426 rod to accomplish this due to the larger wrist pin on the 444cc piston. Rebuilding the crank with the 426 is a good idea in general on these old 400 motors. The rod was the biggest weakness in an otherwise fantastic motor.

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