Custom Frame For Thumper Motor

Discussion in 'Motorized Bicycle Welding, Fabrication and Paintin' started by culvercityclassic, Apr 8, 2011.

  1. sparrow69

    sparrow69 New Member

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    cooling shouldn't be an issue either considering its in a moving bike. the shroud only plays a part if its stationary, but moving along at 30+mph you'll have more then enough ambient air blowing over the fins. Looks good.
     
  2. dmb

    dmb Active Member

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    if it did run too hot [it wont] you could use E85, it's got 15% gas in it. why? so people wont drink it! yep it's moonshine! ran meth. at 14-1 compression in a sprint buggy [VW] at ascott in the 70's no fan and the motor was cold to the touch, ya gotta jet up a bunch thou. no carbon at all, motors look brand new when you blow them up!
     
  3. flex man

    flex man New Member

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    Have you ever seen a methenal fire .No because you cant see it burn .all of a sudden your on fire and cant see it..Cant imagine that scares me as I run pure methenal in the vette suppercharged with meth injector.....
     
  4. dmb

    dmb Active Member

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    how right you are... forgot about that. gitten old
     
  5. culvercityclassic

    culvercityclassic Well-Known Member

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    I worked on the frame a little today and really like the way it is going. I am using 1 ½ tubing for the main frame and ¾ for the rear section. The jig I made is awesome and works so well for alignment. I need to order some parts for fitment to proceed. I am hoping to have this bike complete with a built motor and one more surprise for willow springs that should work good if I can hold on…
     

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  6. Goat Herder

    Goat Herder Gutter Rider

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    Man I just love watching builds like this come together!! These are my favorite threads. Its gonna be sweeet (^):D
     
  7. matthurd

    matthurd New Member

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    slow and steady may not actually win the race, but it certainly makes for a really cool bike :D
     
  8. Venice Motor Bikes

    Venice Motor Bikes Custom Builder / Dealer/Los Angeles

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    I think we need to make a chopper frame like we saw at the swaps today!! (^)
     
  9. scotto-

    scotto- Custom 4-Stroke Bike Builder

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    It's coming along nicely Jeff, I'm really liking the beefed up chain-stay junction down there! Keep it coming, it's an exciting build for sure.

    dnut

     
  10. MotorBicycleRacing

    MotorBicycleRacing Active Member

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    Looking good Jeff. You have some fabricating skills.

    With that HF 6.5 Hp four stroke I will be rooting for you in the Willow Springs unlimited class race against the Morinis and the eBikes.

    Are you running gears?

    I am a thumper kinda guy lol
     
    #30 MotorBicycleRacing, Apr 25, 2011
    Last edited: May 30, 2011
  11. culvercityclassic

    culvercityclassic Well-Known Member

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    I worked on the frame today and now have the main tube for the motor mount installed. This motor will require additional motor mounts and an added torque arm to handle the power. This is a fun build but takes time and thought as to what needs to go where and if it’s really needed.

    I really need to clamp down and get this completed. Someone needs to put the torch on my ass…..
     

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    #31 culvercityclassic, May 2, 2011
    Last edited: May 2, 2011
  12. Bike Monster

    Bike Monster New Member

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    keep going!!!!!!!!!!
     
  13. scotto-

    scotto- Custom 4-Stroke Bike Builder

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    Looking great Jeff, you gonna mount the Suzuki forks on it? Are you gonna go with 24" or 26" wheels? Just looking at the posibilities of your new sweet frame and engine set-up. Cheers bro!

    dnut
     
  14. culvercityclassic

    culvercityclassic Well-Known Member

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    I decide to stay away from my local bar night with friends and work on the bike…also saved some cash….
    Well I got the frame together using the mig and the almost new Miller Diversion 180 Tig took a **** so it’s gone in for repair, which sucks….
    I am real happy with the way the bike looks…going for the Jesse Rooke look and it is headed that way.
    It’s a roller now; I have to decide on the wheels….may go wide since I have the room.

    Hey Scotto...no Suzuki forks...way tooooo heavy.....and going with a disk so the forks won't work.
     

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  15. scotto-

    scotto- Custom 4-Stroke Bike Builder

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    Yeah I hear ya on the Suzuki fork, it weighs more than the tandem frame I'm working on, seriously. I'm putting one on the tandem though, it will handle fine on that rig with a drum brake and going disc on the rear.

     
  16. matthurd

    matthurd New Member

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    lookin awesome :D
     
  17. The 26incher

    The 26incher New Member

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    No bottom bracket for cranks and pedals Jeff? Going for the straight mini motorcycle frame? Are you going to weld foot pegs cafe or chopper style?
     
  18. Venice Motor Bikes

    Venice Motor Bikes Custom Builder / Dealer/Los Angeles

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    I've been meaning to post about that!!?? where's the pedals??? :rolleyes:
     
  19. scotto-

    scotto- Custom 4-Stroke Bike Builder

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    I'm sure there will be pedals, he just hasn't welded the BB on yet.

    dnut
     
  20. tomgndallas

    tomgndallas New Member

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    just picked up a harbor freight motor myself. I have been pondering an engine for a long time now. the local shop had the 6.5 for 94, i brought in the web price of 74 and they honored it. Lightweight engine too, very cool. Now its time to choose a frame and get started on a long project. I still have a 69 CB450 project I need to finish before I get started on the MB project...

    Hey Sportscar Pat, if you read this, ever think of making a drop loop or sportsman frame for this little motor? I got cash in the paypal account!
     

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