Opinions on putting a 85 cr500 engine in a 350x frame.

[chevman51]

I have a 85 Honda 350x Astro conversion rolling chassis I picked up for cheap earlier this year. I have been looking for a engine and came across a 85 cr500 complete running bike. I see a lot of threads about putting that engine in a 250r frame but not much info about a 350x frame. Does anybody know how difficult this would be? Thanks

[cobradude]

I would not do it, only because the 350x frame has some well documented weak spots, & if you check over that 350x frame, there is a strong possibility that it is already cracked! Of course, there is a gusset kit out there, & you can make your own gussets too, so why not? Just make sure you take care of your weak spots!

[chevman51]

Thanks for the info. I didn't think about the weak points. I need to look the frame over a little closer.

[bkm]

I would convert the dirt bike before messing with swapping it into another frame like a 350x. Even the 250r frame has to be highly modified to make it work. Then you are messing with exhaust and things like that. I know Laeger's back in the day used to sell a 2-3 wheeler conversion kit for the cr500, I'm not sure what years it was for though?

[keister]

Don't want to rain on your parade, but that motor will eat that frame quickly.

[atc007]

Super bad idea, as said above. That frame will disintegrate under a 2 cycle 500.