XT250 to XT350 conversion
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Thread: XT250 to XT350 conversion

  1. #1
    Junior Member GIFUTW's Avatar
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    XT250 to XT350 conversion

    1983 XT250T. I'm guessing the crankshaft, connecting rod, and cylinder would have to be transplanted from the 350. Am I missing anything? Anybody done this one?

  2. #2
    Senior Member kj7687's Avatar
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    Is the bottom end of the two motors the same, other than crank and con rod?? I have no idea but that sounds kind of unlikely...? Could an XT350 cylinder even fit down into the crank case of the 250? Also seems very unlikely, to me, at least.

    If it were possible though, that could be a cool conversion. Even more cool could be a "factory" big bore "kit" with this idea, on a newer, fuel injected XT. If one could just change the parts you mentioned, and then basically plug 'n play the 350's cylinder, and then get a fuel programmer... I'm just having pipe dreams at this point lol.

    I am not an engine builder, but the more I think about it, the more ludicrous and impossible this seems
    Last edited by kj7687; 06-16-2016 at 09:27 PM.
    KJ, just KJ, ok.


    Current rides:
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    Past rides: 2015 Yamaha XT 250, 1997 Suzuki DR 200, 2007 Honda Ruckus, 2007 Yamaha TW 200, 2007 Kawasaki Ninja 500, 2009 Kawasaki KLX331S; 1994 GMC Sierra 1500, 1987 Nissan Pathfinder, 1992 Acura Integra, 1986 Honda CRX, 1989 Jeep Cherokee, 1994 Chevrolet Astro Van, 1979 Volkswagen Rabbit, 1984 Jeep Cherokee

  3. #3
    Senior Member Eatmore Mudd's Avatar
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    I'm in WA. and have a XT350 engine available locally for fit testing and also for parts measuring.
    littletommy likes this.
    '87, '90, 90 & '91 XT350's. It's a family thing, wife says its an enabling thing. Saving up for a TW of my own.
    Looking for anything Yamaha XT or related. especially a brake caliper and master cylinder.

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  5. #4
    Senior Member Eatmore Mudd's Avatar
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    Hey GIGUTW,

    We are an ocean distance away from each other but I we can exchange information measurements drawings etc to try and figure out if this will work.
    The flip side of this is the electric start. XT350's never had it.
    littletommy likes this.
    '87, '90, 90 & '91 XT350's. It's a family thing, wife says its an enabling thing. Saving up for a TW of my own.
    Looking for anything Yamaha XT or related. especially a brake caliper and master cylinder.

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