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stocktires
12-30-2004, 07:05 PM
What are the differences between the 400f motor, 426f motor, and the 450f motor?
SRH
12-30-2004, 09:08 PM
decompressor is auto matic on 450fs,trannies are diff not sure what else
stocktires
12-30-2004, 09:23 PM
Originally posted by SRH
decompressor is auto matic on 450fs,trannies are diff not sure what else

Thanx, isn't there any easy fix for the decompressor problems on old yfz motors?
If anyone has any other info, lmk
SRH
12-30-2004, 09:30 PM
not id think yoou could just put the setup from the 450 in couldnt ya?i dont think there were any problems with the old setupd you just had to do it manually
K_Fulk
12-30-2004, 11:45 PM
Didnt the yzf400 motors have stainless valves?
mojoe2878
12-31-2004, 05:49 AM
Originally posted by stocktires
Thanx, isn't there any easy fix for the decompressor problems on old yfz motors?
If anyone has any other info, lmk
you can get a newer upgraded exhaust cam for the older motors that will do away with the manual decompresser.
WickedWhite450
01-01-2005, 08:29 AM
Originally posted by K_Fulk
Didnt the yzf400 motors have stainless valves?

i believe so. The Displacement is different also. The YZ400f is a little outdated compared to the 426 and the 450, but im not saying its slow. Its just different technology. They took the same motor and upgraded it.