600ex

[440exwlspankyou]

Has anyone heard of putting a xr600 top end on a 400ex case? A friend of mine told me that it may work. Does anyone know if there is any other top end that will fit to get more displacement?:devil:

[parkers30]

that would be crazy if it worked....

[R3Concepts]

Why not just put a crf450 in a 400ex frame or buy a 450R?

[440exwlspankyou]

I have a case to a 400ex and a friend of mine has a 600 top end and I want to know if it will work before he has to search for it in his trashed garage. Thanks :)

[hondafox440]

I think the only way to find out is to try it. I'm sure the case will have to be machined to accept the large sleeve though.

[markk]

I have heard of that before, but i also heard that she will run a little warm, and the gearing is all wronge!!!

[440exwlspankyou]

has anyone else here done this?

[R3Concepts]

Personally I dont think its a great idea, you are going to end up with more problems then its worth, but to each is own.

[Juggalo]

you could probably get it to work but not without some serious machine work and fabrication first. hell they put CR500 jugs on 250r lower ends, i have even seen a r6 cylinder on a xr100 bottom end i believe it was. anything is possible. but if your asking if it will just bolt up and run theres probably about .5% chance that it will work. and even if it did youd need to beef up your bottom end like crazy, you'd prob need a whole new timiing/electrical system, ect.

[440exwlspankyou]

Is there a top end that will just bolt up and run??

[44oEX]

except the xr 400 I would have to say no