Could i put a yz426F cylinder, head and piston on a yz400F engine?
Go to www.Powroll.com, This is pasted from it, they got pretty cool kits.
YZF & WR 400
These first-generation F's can be easily upgraded to 426cc with stock Yamaha parts -- or to 440cc's with the parts listed, plus our 2.0mm stroker listed above.
One weak point on the 400 is the smaller piston pin. Upgrading to the 426 parts gives your engine better reliability for the same (or cheaper) prices than purchasing these parts aftermarket.
You can have your 400 cylinder bored and re-nikasiled, but this process typically costs more than the $250 you'd pay for a new 426 cylinder!
To rebuild your 400 to a 426, you will need to purchase the following from your Yamaha Dealer:
YZF 400 CRANK PIN
YZF426 CRANK BEARING
YZF426 ROD, CONNECTING
YZF426 PISTON (STD)
YZF426 PISTON RING SET (S
YZF426 PIN, PISTON
YZF426 GASKET, CYLINDER H
YZF426 GASKET, CYLINDER
YZF426 CYLINDER 1
Prices are quoted from Yamaha of Troy (February 2004) and are subject to change.
Your 400 crank will need to be rebuilt with the new 426 rod and needle assembly. You can have a local shop do it, or order our 440cc kit above, and we'll take these parts and make your 400 a 440!
My '98 400 is now a 444 using a 426 jug.
How much more power and tourqe will the 440 stroker kit give me on a YZ400F??
a lil'mo bottom and mid,will pull a bit harder up top,dont expect it to be a completely different animal though,it will run better though
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