250r frame with 450r or 400ex?? idk need help

[chad41d]

does ne one have advice cause i have a 250r frame with a 350x motor but i wana put a 400 or 450 on it or does the jug's off a 400 work on the 350?????

thnx

[Rootar]

no the jugs dont swap, if i was you i would build the 350x motor up , or just sell the bike and buy a different one

[honda400exr]

If the frame is already done for a 350x then a 400ex will fit in fairly easy..it takes a little bit of fab work on the front motor mount and raise the rear mount about an inch or so..fab together some spacers for a top mount...notch and reinforce the top left bar on the fram so the motor can slide over and the frames ready to go...you will have to grind a little off the left side of the rear mount on the 400 motor so it can slide over and align the sprockets...not a real big deal there's no oil flowing through it and it's still plenty thick enough so it won't break...I have one built now if you want pictures of what needs to be done