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rancid
08-13-2005, 04:49 PM
can a yz400 with a crank or piston be turned into a 450 are they basically the same motors, and will it bolt into a yfz quad frame.
EvilJester400EX
08-13-2005, 05:10 PM
The YZ450 engine will bolt into the YFZ frame, the only modification that you will have to make is to the front sprocket, you will need to put a spacer behind it for the chain to line perfect.
zeppelin
08-13-2005, 10:05 PM
the 400 wont its completely differnt tfrom the 450
stocktires
09-06-2005, 09:53 PM
They all bolt up the same, but I know internally the 400f is a different motor in a good many of ways compared to the 426f, and especially the 450f.
sampleez
09-07-2005, 06:00 PM
yzf450 and yfz450 are not the same. you need different motor mounts, and have to mod the frame

http://www.yfztech.com/forum/index.php?showtopic=2937
stocktires
09-07-2005, 07:06 PM
wow, news to me. So do all the bike motors mount up the same, and just the quad motor is different?
Chino886
11-29-2005, 08:36 AM
Originally posted by sampleez
yzf450 and yfz450 are not the same. you need different motor mounts, and have to mod the frame

http://www.yfztech.com/forum/index.php?showtopic=2937

Have any of you guys heard of the YZ450F Motor in a 400EX frame, I heard it works!