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rocky1980

engine swaps

3 posts in this topic

hi guys i recently rebuilt the top end of my 2003 yz450f after a few glitches she was up and running sweet......untill one day the kick start jammed!!!! i put her in gear and pushed it backward and the kickstart came back up and all was well.

then............. a few days later it did it again so i rolled the bike back then the kick start came back up so i kicked her off only this time it kicked back smashing my crankcase disaster.

i couldn't find any parts at all in the uk so iv had the case welded up whilst its off i thought ill fit a new cam chain as i removed the flywheel i noticed that someone in the past has had this off and a washer has been pulled inside before the flywheel was fitted and its been smashing the flywheel up so now the flywheel looks a mess inside so luckily  iv managed to order another one.(how it still run is anyones guess) 

I'm sick to the back teeth of this bike its cost more money than its worth.

 

my question is will a yzf250 2 stroke motor fit in my frame? or are they different mounts etc.

 

cheers fellas 

Edited by rocky1980

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my question is will a yzf250 2 stroke motor fit in my frame? or are they different mounts etc.

 

 

Not without cutting and welding.  The front of the frame has to be modified to accommodate the exhaust.   The end product would be a rather overweight 250, most likely.

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