Maintenance & Technical > KX500 Original

Getting started project KX5 in 06 Aluminum frame

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KXcam22:
Yeah Doordie likes to spin them fast. Lots of overrevving going on on the ice!!

 Hangtime,
   You also might be able to find a grenaded one with some phone calls to dealers.  Someone who has to put $3K or more into a motor repair might be real interrested in selling it sans motor. Worth some calls anyway. Good project. Keep us posted. Cam.

emullen:
Hangtime-

Great bike.  I'm considering the transplant myself.  If you don't mind, can I ask a few questions so that I do not have to reinvent the wheel- know what I'm saying?  First (of many, I'm sure, and thanks in advance for your help), why did you choose the 450 over the 250 frame?  Will the 250 work? I have a chance to get a 250 so I would like to use it for that reason if it is workable.

Thanks,  Eric

hangtime:
Howdy emullen,
I chose the 450f frame because it appeared to me that the engine cradle and the down tube on the 250f frame were prohibitive. The engine cradle tubes begin an upward bend too early to meet the down tube. The down tube appears to be at an angle that would pass through about where the front of the 500 cylinder needs to be. That does not mean you couldn't cut out and weld on more of the down tube (starting  closer to the steering head tube) and  cradle, but the new piece (down tube) would be welded on at a different angle than the original. This in my mind puts up a lot of red flags, the load that passes down that tube needs to continue along the same (original) plane. Also there is a second wishbone that attatches the down tube to the upper frame spars. I would not recommend cutting above that point. That actually carries more load than the engine cradle/wishbone below it. Lastly, the cast piece on the 250f where the swingarm bolt passes through has a different bend to it. I think this might interfere with a 500 kickstarter.

Keep in mind I have never actually tried to set the 500 motor in the 250f, all of my conclusions were based on photos and simple overlaying a 500 motor on the two frames in photoshop. Hit me with as many questions as you want, I'll be glad to help.
 

kx666:
there is a guy in californa doing this with CR500s. he actually has acontract with honda. honda sends him the parts (compleate motor) last i heard of him was in eary 2005, he had the new 2005 CR 250 (before some of the dealers had the bike) would pull the motor using in for a kart, them stuff a cr500 in it and would sell them for about $10,000

ebers17:
Yeah, Service Honda does that.  www.servicehonda.com and you'll see all the information about it.

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