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  1. #1
    Junior Member Mollybones's Avatar
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    Install bigger engine?

    Hey Guys, Mollybones here in Maine. After well over 15,000 miles of good times and heavy luggage, my dear friend, The Ratty Pidgeon, is sucking air and it also sounds like his inner sprocket is worn out. Going to replace the engine before our next big adventure together ( The Continental Divide Trail ). Is it possible to put a 250 engine on a TW? Anyone done it before? Thanks!
    Love, Bones

  2. #2
    Super Moderator littletommy's Avatar
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    Ronnydog, TW-Brian, macbig2k1 are just a few of the guys who know how to build up your TW engine. You could PM them or look for further info here on what they did.
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  3. #3
    Junior Member Mollybones's Avatar
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    Thanks buddy. I will try to figure out how to connect on here. Bones
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    Senior Member macbig2k1's Avatar
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    225 crank shaft (58 mm stroke) + XT250 piston (74 mm bore) + fitting bigger sleeve = 250 cc

  6. #5
    Senior Member GaryL's Avatar
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    There are 2 schools on this. You can build up your existing engine to get it up to 250 CC s or you can buy a 250 from an XT and go for that. Either of these options do take a lot of intricate engine work and a good machine shop to get it done. The 250 XT engine has to have the output shaft extended and a carrier bearing added so the sprockets align. Not an easy or inexpensive task! The TW engine has to have a lot of machining of the cylinder around the base to accept the larger piston and clear the top of the case. Also a big job.

    Not saying these upgrades can't be done because we do have proof right here but there are those like me that would probably tel you to go buy an XT 250 and about all you will lose is the fat tires. You will gain power, 6 speed transmission and much improved suspension. I sure love the threads about these technical upgrades but I have to remember most of the guys who tackle such endeavors either are machinists or have one close by willing to work with them. By the time you are all done and ready for the adventures I will bet you spent more money than just buying a bigger bike would cost. Just My Opinion.

    GaryL
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  7. #6
    Senior Member macbig2k1's Avatar
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    The XT250 engine doesn't fit.
    The XT/TTR 225/230 are different from the XT250.
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  8. #7
    Senior Member Devils Advocate's Avatar
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    I was going to go the XT225 crank route but I decide that what I want more than just a few more horses is the six gears. I'm looking for an XT225 donor and then I think I'll upgrade to a 10.5:1 piston. There is a fellow here that does the mods to a TW tail shaft and that coupled with the TW right shaft bearing is pretty much plug and play. (Circle F Machine) This will give near 20 horses and six speeds with a lower first and a sixth that's taller than the TW's 5th to boot.
    Last edited by Devils Advocate; 08-17-2015 at 04:25 PM.

  9. #8
    Senior Member scotti158's Avatar
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    You can spend a bunch of money and time getting more ponies out of a $2000 TW and you still have a $2000 TW that is under powered and vibrates a lot.
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  10. #9
    Senior Member GHDave's Avatar
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    Quote Originally Posted by GaryL View Post
    You will gain power, 6 speed transmission and much improved suspension.
    GaryL
    According to Yamaha's web page, the XT250 comes with a 5-speed.

  11. #10
    Senior Member GaryL's Avatar
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    Quote Originally Posted by GHDave View Post
    According to Yamaha's web page, the XT250 comes with a 5-speed.
    I don't know anything about the XT 250 but I do have an XT225 out in my shed and it sure does have that extra gear!

    GaryL
    Be Decisive! Right or Wrong just make a decision. ​ The road of life is paved with flat squirrels that couldn't make a decision.

    Since light travels faster than sound, some people appear bright until you hear them speak.
    If I agreed with you, we'd both be wrong.

    1987 Yamaha BW350 Big Wheel
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    Kubota BX2370 Subcompact tractor with snow blower
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