Survey: 74mm bore up kit. Who or how many people want?
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Thread: Survey: 74mm bore up kit. Who or how many people want?

  1. #1
    Member tumbleweed's Avatar
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    Survey: 74mm bore up kit. Who or how many people want?

    Hello all,

    I thought missed timing but maybe still good for ask. I just want to know how many people want to have 74mm bore up piston kit?

    Please post to comment here or put "like" if you want to kit. Nice to hear more request detail if you have. (like how much compression you want , willing price range etc.)

    Reminder: It is not bolt on. TW200 crank case sleeve hole diameter is 73mm. You have to working on under list so far.
    *Required crank case hole bored out and grind off inside for sleeve fitting.
    *Need 58mm stroke crankshaft to make 249cc. (239cc by 55.7mm stroke crankshaft)
    *Stock Yamaha XT250 piston has interference between counter balancer shaft.
    *Some piston using 17mm diameter piston pin. That kind of pistons has to extra work for fit in.

    (Some design change possible.)

    We can make engine parts whatever spec we want in these days and I have all connection. I thought not many people want to try 249cc mods but receiving many mail questions and I don't have enough time for better answer to all.

    PRICE: That will be according to how many volume we going to order so. I know we all want to reasonable price but need big numbers of order then. Split words to the world.
    Current: I don't know about detail but actually available from Engines only for TTR230 motor : TTR 230


    Let me hear your voice.


    Thank you.

    tumbleweed
    Last edited by tumbleweed; 03-10-2017 at 02:24 PM.

  2. #2
    Senior Member Skin Walker's Avatar
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    I would be interested.


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    - SW


    2006 TW
    1998 TW
    1996 TW
    1993 TW
    1985 BW200
    1987 B200E
    1979 Honda Z50
    ..and 1 Chihuahua

  3. #3
    Member TrailWaysAW's Avatar
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    Interested as well, though someone would have do to it for me though as I'm not mechanically inclined, like, at all lol
    -TWitchy Squirrel

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  5. #4
    Senior Member Fred's Avatar
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    Interest is inversely proportional to the total cost of parts and machine work. Need ballpark figures to evaluate the 74mm Big Bore kit.
    Active Thumpers:
    2003 TW200 "Betty Boop"
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  6. #5
    Member tumbleweed's Avatar
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    Should I ask how many people want TW250 instead bore up kit? --------No, I'm nothing from yamaha company related.

  7. #6
    Senior Member Skin Walker's Avatar
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    I have a spare engine I'd love to break down and do this upgrade to.


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    Tweaker and littletommy like this.
    - SW


    2006 TW
    1998 TW
    1996 TW
    1993 TW
    1985 BW200
    1987 B200E
    1979 Honda Z50
    ..and 1 Chihuahua

  8. #7
    Member TrailWaysAW's Avatar
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    TW250 swap would be awesome!
    -TWitchy Squirrel

  9. #8
    Senior Member Skin Walker's Avatar
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    Any idea what a "rough" price estimate would be?
    - SW


    2006 TW
    1998 TW
    1996 TW
    1993 TW
    1985 BW200
    1987 B200E
    1979 Honda Z50
    ..and 1 Chihuahua

  10. #9
    Senior Member scotti158's Avatar
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    13 hp gets me into enough trouble.
    2013 Yamaha TW200

    1996 Yamaha TW200

    1995 Kawasaki KLR650

    2002 Yamaha RoadStar 1600 with sidecar

  11. #10
    Senior Member SHAG's Avatar
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    Quote Originally Posted by scotti158 View Post
    13 hp gets me into enough trouble.
    Just think what 14 will do! You're gonna poke your eye out
    littletommy, Fred and grewen like this.
    Go like hell, You'll get there quicker!
    05-BMW1200GS- Rock Red 102k miles
    2013-TW200 - 5k- miles

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