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Project Four banger to 2 banger, this will be interesting

Discussion in 'Your 250cc Projects' started by Alfiestorm, Aug 30, 2023.

  1. Alfiestorm

    Alfiestorm Well-Known Member

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    My next project bike is going to be a two stroke powered looney.

    I was thinking of getting a aluminium frame from a 125 sport bike and fit a 250 liquid cooled two stroke parallel twin into it.

    After much searching I came up with nothing as selling prices for the frames are pie in the sky prices and that was just for the bare frame and so the idea died away.

    Then while thinking what else is there I can do that will confuse people when they see it and sound totally unlike it should and have unexpected performance..

    So with cost being a major factor I have decided to track down a Hyosung GTR 125 or 250 and sell on the engine.

    Very early days but should be interesting. Oh the engine choice is a MK1 Suzuki 250 gamma engine due to it not having a power valve so will be raw power delivery.
     
    Alfiestorm, Aug 30, 2023
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  2. thebeefsalad

    thebeefsalad Well-Known Member

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    Banshee motor would make things interesting
     
    • Agree Agree x 1
    thebeefsalad, Aug 30, 2023
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  3. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    A Megelli frame should also be cheap. They have full fairing model with good brakes and reasonable susension.
     
    Murdo, Aug 30, 2023
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  4. DannoXYZ

    DannoXYZ Well-Known Member

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    I had similar idea for track bike. Wanted responsive geometry and tight wheelbase ~1350mm.

    Suddenly NSR250 MC21 frame popped up!! I'm building it up with old used RZ350 engine first. Good test-bed for dialing in Microsquirt. Hopefully it'll last one season.

    [​IMG]

    While I build up 421cc Banshee engine with TURBO!! Similar to this one.

    [​IMG]

    [​IMG]
     
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    DannoXYZ, Aug 30, 2023
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  5. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    Aprilia RS125 and Cagiva Mito 125 frames get used for such projects - they may be available
     
    ruckusman, Aug 30, 2023
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  6. Alfiestorm

    Alfiestorm Well-Known Member

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    Certainly would but unfortunately they are financially out of my reach
     
    Alfiestorm, Aug 30, 2023
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  7. Alfiestorm

    Alfiestorm Well-Known Member

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    That looks a wild project
     
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    Alfiestorm, Aug 30, 2023
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  8. Alfiestorm

    Alfiestorm Well-Known Member

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    Looked at those and prices are over the top just for the main frame.
     
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    Alfiestorm, Aug 30, 2023
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  9. DannoXYZ

    DannoXYZ Well-Known Member

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    Yeah! Target is 100bhp and 100kg with 3-4ltr petrol!! :)
     
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    • Love it! Love it! x 1
    DannoXYZ, Aug 31, 2023
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  10. DannoXYZ

    DannoXYZ Well-Known Member

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    How about KTM RC390 frame? I was looking at those originally. Really light and stiff! Very common here since so many of those engines blew up.

    Are you handy with welder? Can build your own trellis frame.

    7C724D79-179B-47A5-86EA-D23072FF0334.jpeg
    39D56D54-8E56-4EC6-9DFA-6C3672930A22.jpeg
     
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    DannoXYZ, Aug 31, 2023
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  11. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    Bugger, they're excellent candidates, obviously word has gotten around...
     
    ruckusman, Aug 31, 2023
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