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  1. #1
    Moderator beerdart's Avatar
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    Oneboss302 Mark Hahn Flat-top Reborn.

    I acquired some of Marks 1200R cylinders sleaved and decked to use Kawasaki flattop pistons(81mm) from RPM that will be used to rebuild Oneboss302's 1200. We have been in contact and decided to go with ADA Yamaha shell and Kawasaki 30cc domes. I offered to make some gas valves using Polaris parts. So the build is moving forward and all parts should be on the way. If anyone has any experience with the flattop motor and can offer any advice please do so.

    Tonight I mocked up the cylinders, manifold, gas valves and head. I needed to clearance the valves for the 81 bore. Everything else looks to be in order. I cut the ADA shell into three's. Enjoy Pat and let Mark run with you..

    Pistons are Pro-X 4494 Rings are RIK 59013.
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  2. #2
    Its better to burn out than fade away christian79's Avatar
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    Wow looks great!!!!!

  3. #3
    Mike xsockguyx's Avatar
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    Looks awesome Steve. Pats gonna have a really nice set up.

  4. #4
    Hydrotoys's Avatar
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    Talk to Lowell about the squish. He will steer you correct.

  5. #5

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    All I can say is.. "Steve is the MAN!!" couldnt have done this without him!!

  6. #6
    very very very nice....... Now all you need is a crank and a fuel injection set up.... Hmmm

  7. #7
    Moderator beerdart's Avatar
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    Quote Originally Posted by Hydrotoys View Post
    Talk to Lowell about the squish. He will steer you correct.
    <OneBoss302> Lowell said to use the kawi flat tops and test the squish. SHOULD be good but if too much squish or comression, compensate with base gaskets. Believe it was .040-.055 squish. I have it written down in my notebook

  8. #8
    "Hustler" Inkaddict's Avatar
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    This is awesome! Congrats Pat!

  9. #9

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    Thanks TJ. Im very excited. Lookin forward to a New Years Day ride!

    BUURRRRRRRRRR!!

  10. #10
    Moderator Insanediego Joe's Avatar
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    That ADA head looks familiar....I was one of the first to cut them into 3 pieces . It seems to help the orings survive.

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