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View Full Version : YZ426 in 400ex frame?


LT250Racer609
07-02-2007, 04:04 PM
Does the yz426 motor fit pretty well into the 400ex chassis without having to modify anything else But the motor mounts?? Im looking to pick up a 400ex frame, switch everything from my 250R chassis onto that, rather then modifying my 250R frame.
ss440ex
07-02-2007, 04:18 PM
Yeap!!
I think its one of the easyest frames to use.
Groves187
07-02-2007, 06:00 PM
Yeah i would agree with ss440ex, the EX/YZ Swap i probably the
easyest,

PLZ add in if i forgot somthin

Make a Bushing for the Pivot bolt and motor
Buy the front motor mounts
Make rad. Mounts
Make bottom motor mounts
Make head stay mount

and i think thats about it...
ss440ex
07-02-2007, 07:07 PM
Also a .230 spacer for the R/H side of the YZ engine.
Because its that much shorter than the 400ex.....
Groves187
07-03-2007, 04:47 AM
I knew i was forgeting somthin..
LT250Racer609
07-03-2007, 07:03 AM
Originally posted by ss440ex
Also a .230 spacer for the R/H side of the YZ engine.
Because its that much shorter than the 400ex.....

what do you mean a spacer??
ss440ex
07-03-2007, 10:31 AM
Originally posted by LT250Racer609
what do you mean a spacer??

The YZ engine is not as wide in the rear as the 400ex.
Between the swing arm.....

Spacer must go on the R/H side for sprocket aliegnment.
Positioning the engine to the L/H side.
LT250Racer609
07-03-2007, 12:24 PM
Originally posted by ss440ex
The YZ engine is not as wide in the rear as the 400ex.
Between the swing arm.....

Spacer must go on the R/H side for sprocket aliegnment.
Positioning the engine to the L/H side.

Yah I already noticed that when I dropped it into my 250R frame...I just didnt know if thats what he was talking about or not.