xr400 to a 400ex

[jones711]

Ok i need to know will a XR400 Engine bolt up to a 400ex frame and how do I go about doing this. What do you do about the kick start kicking backwards? I know there is a thread for this but I can not find it. Please dont redirect me to a differnt thread, if you could just let me know that would be great.
Thanks for your help


:cool:

[honda400ex2003]

the xr will fit but it either has to be converted to electric or you can cut out the fender. you may also be able to get an old 250x kicker or something to work. i am not sure on that. Otherwise everything else with work. steve

[powertechn2]

wouldnt it have crazy tall gearing? i never really thought too into it, so its sorta irrelevant, but just wondering

[honda400ex2003]

im not really sure how much taller it is but i am sure you could get it close with a 14 and a 39 to what the ex motor is stock with just the 14 on the front. i am curious too. steve

[jones711]

Thanks im thinking about going ahead and doing that.:D

[quadbod]

Engine mounts are different.

Why would you want a xr engine anyway?

Originally posted by quadbod
Engine mounts are different.

Why would you want a xr engine anyway?

Slighty higher compression, slightly more aggressive cam, lighter flywheel, and kick start.

[RIDEREDson]

I dont believe its a direct bolt up application.

[xcracer416]

Originally posted by DMC-4OOEX
Slighty higher compression, slightly more aggressive cam, lighter flywheel, and kick start.

from what you described in that post it would be cheaper to do it to your motor if its good. unless you have an xr400 engine laying around

[powertechn2]

how much $$$ were you really planning on spending to do this if you do it?