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

  1. #1
    Join Date
    Jan 2012
    Location
    Republic, WA
    --
    25

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

    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

  2. #2
    Join Date
    May 2009
    Location
    alabama
    --
    68
    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!

  3. #3
    Join Date
    Jan 2012
    Location
    Republic, WA
    --
    25
    Thanks for the info. I didn't think about the weak points. I need to look the frame over a little closer.

  4. #4
    Join Date
    Jun 2010
    Location
    House Springs MO
    --
    5,494
    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?

  5. #5
    Join Date
    Jun 2005
    Location
    Soutwestern PA
    --
    2,040
    Don't want to rain on your parade, but that motor will eat that frame quickly.

  6. #6
    Join Date
    Sep 2010
    Location
    NEPA
    --
    7,049
    Super bad idea, as said above. That frame will disintegrate under a 2 cycle 500.
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