Custom Frame For Thumper Motor

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

  1. culvercityclassic

    culvercityclassic Well-Known Member

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    I did not see anyone without a helmet... So that is bad info Tre

    On a side note the catch can works good and it is a must on this motor. I would be interested in seeing your project some time or if you want to test ride mine you are welcome... Just let me know
     
  2. Venice Motor Bikes

    Venice Motor Bikes Custom Builder / Dealer/Los Angeles

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    I also had to jet my 2-stroke bike down because of the high elevation!
     
  3. culvercityclassic

    culvercityclassic Well-Known Member

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    Update on bike 6/27/2011

    I put some real miles on the bike this weekend. Rode to Malibu Beach up PCH, what a ride with all the crazy drivers trying to run me off the road. One thing for sure is the surprise look on their face when I hole shot them off the line. I also went to Venice Beach and had a beer with VMB. Lots of Girls for sure….

    The bike runs so well it is a pleasure to ride. I changed the oil to Opti-4 since this was a gift from BiMoped at willow, we shall see how it performs.
     

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    #103 culvercityclassic, Jun 27, 2011
    Last edited: Jun 27, 2011
  4. FarRider

    FarRider New Member

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    Great to hear that Culver...she looks sweet. You did the catch can very well.
    Just what engine is that any way? And how did you modify it to look like that?
    I just horse traded myself a extra large size workman style frame and I'm thinking 4 stroke... any suggestions?
    FR
     
    #104 FarRider, Jun 27, 2011
    Last edited: Jun 27, 2011
  5. scotto-

    scotto- Custom 4-Stroke Bike Builder

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    Here's a suggestion......what are you waiting for? 4-stroke it or go to bed :D

    Just a suggestion......hahaha

    dnut
     
  6. culvercityclassic

    culvercityclassic Well-Known Member

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    More info chit on the thumper...this time it’s a new exhaust. My neighbors will be relieved.
    This is my simple design which allows me to repack if needed. The result as far as sound, it’s now a nice deep tone till you jump on it…then it barks hard…

    I plan on building one more exhaust…just need to find 1 in. tubing with a 4 in radius…good luck





    Ya like Scotto said...what are you waiting for?
     

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  7. scotto-

    scotto- Custom 4-Stroke Bike Builder

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    Niiiice pipe......let's smoke! :D Very creative and functional......

    dnut
     
  8. msrfan

    msrfan Active Member

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    Hey CCC, nice pipe. There's a couple of places local to me that may be able to make the bend you need. One in Costa Mesa called Railmakers. They make stainless boat railing. The other is Advanced Tube Engineering in Huntington Beach. I've used both for various things and found them to be good to deal with. Railmakers is by far the most reasonable but both have remnants and cutoffs they sell cheap.
     
  9. culvercityclassic

    culvercityclassic Well-Known Member

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    Thanks for that info msrfan, I will check it out
     
  10. sportscarpat

    sportscarpat Bonneville Bomber the Salt Flat record breaker

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    Just a stupid question since I have not read through this whole thread, but how do you start this engine? I see the HF engine comes with a pull start.
     
  11. Joaquin Suave

    Joaquin Suave New Member

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    I also have used both companies, Railmakers to roll some tubing and ATE for an aerospace job. Both are great to work with, though ATE will probably ding you kinda hard for a one off item.

    Another couple of other sources can be found in the alleys and cul de sac's right behind Trader Joes on 17th street up on Goat Hill. There are a some small shops that are geared towards boat fab and don't seem to turn away little cash jobs.

    CCC, i dig your safety wire coupling! I use that stuff to fix all kinds of things.
     
  12. culvercityclassic

    culvercityclassic Well-Known Member

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    I called RailMakers today, real nice people. I will try to get that way soon. I am also trying to find a reverse cone megaphone small enough for this motor with a 1 in inlet. Any help please.

    Pat: I use the rope off the pull starter to start the bike, old school style. The good thing is you won't be able to steal it very easy. But then again I don't plan on leaving it, I plan to ride it... Lol
     
  13. FarRider

    FarRider New Member

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    Very funny... I guess thats what passes for wit in So Cal.
    It was a simple question-
    What model engine is that, if you dont want to answer? fine, just spare us the half baked comments... the bike aint that nice.
    FR
     
  14. culvercityclassic

    culvercityclassic Well-Known Member

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    Settle down my Pterodactyl, no need to get in a huff over this...It's a Honda 6.5hp clone stripped of all its sheet metal and tilted upright. Added some after-market hop up items and there she goes...

    Ya.. it aint that nice but it sure is fun to ride...
     
  15. scotto-

    scotto- Custom 4-Stroke Bike Builder

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    Oh.......wasn't that you FR? Asking for suggestions?

    It was a very simple answer big apple......2-stroke it, we can take a joke as we're just nit wits out West :D Just speakin fer me stupid self mind you ;)

    dnut

    I've got a much better suggestion.....but I doubt you wanna hear it.....lol
     
    #115 scotto-, Jun 29, 2011
    Last edited: Jun 29, 2011
  16. doug713

    doug713 New Member

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  17. culvercityclassic

    culvercityclassic Well-Known Member

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    Thanks Doug...I did look at that site this week...nice stuff...I will give them a call..
     
  18. Mr.B.

    Mr.B. Well-Known Member

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    I too have been thinking about using a Thumper and would really like to thank you and the pioneers here for blazing the trail!

    In regards to the oil blow by issue you solved so well in post #89 do you think this idea could also work?

    There's already a plug at the end of the mounting flange so this would be a pretty easy fix.

    But perhaps there would still need to be a vent incorporated?

    ???

    -Kirk
     

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    #118 Mr.B., Jul 2, 2011
    Last edited: Jul 2, 2011
  19. culvercityclassic

    culvercityclassic Well-Known Member

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    Mr B,

    That would work fine but you still need a vent. You may be able to incorporate a vent in that line with a tee fitting.
     
  20. Mr.B.

    Mr.B. Well-Known Member

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    Thanks!

    -Kirk
     

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