400ex framed 250r motored hybrid. HELP!!

[jcs003]

i am just getting started on a 400ex/250r hybrid build. does anyone have any advice or tips they can give me.

[mac_ando]

should'nt be that hard if ur putting a 250 into 400 frame. the swing arms are pretty much the same. as far as where they mount up

[jcs003]

thanks, mac-ando what radiator will mount up without welding on mounting tabs?

[400ex28]

I am sure you will have to make new motor mounts. the 250r radiators work well in the 400ex frame, but prepare to do some welding.

[jcs003]

im an engineer that spends some time in a machine shop, so i thought about making some kind of bracket that clamps around the frame for the rad. what do you guys think?

[midwest honda]

Just a suggestion but u might consider some kind of rubber on the mounts to account for the vibrations. If you just mount it up like a 400ex engine it will vibrate the hell out of u.

[rustyATV]

Originally posted by midwest honda
Just a suggestion but u might consider some kind of rubber on the mounts to account for the vibrations. If you just mount it up like a 400ex engine it will vibrate the hell out of u.

A 250R motor?

[2muchquad]

no it wont a 250r motor has a c/b.Even a cr250 motor wont be bad,you'll only notice slightly more vibes when you rev it up in neutral,its a non issue.:D