Custom Frame For Thumper Motor

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

  1. Ballin on a Budget

    Ballin on a Budget New Member

    Joined:
    May 26, 2011
    Messages:
    86
    Likes Received:
    0
    Hey CCC love the new pipe for sure. Have you thought of using a silencer from a dirt bike? Just like a slip on FMF or something? Just cuz thet way it would be repackable and rebuildable and have a nice tuned sound. The one I use is from a CR250 which has a 1" inlet so might work out well (way overkill for my 66cc HappyGoLucky motor but sounds sweet)

    Just thought it would look super gnarly on that bike too! Amazing bike, made me start lookin into a 4-stroke build to start now.
    -Dan
     

    Attached Files:

  2. scotto-

    scotto- Custom 4-Stroke Bike Builder

    Joined:
    Jun 3, 2010
    Messages:
    6,530
    Likes Received:
    6
    Did you check this place out Jeff? Exhaust Conical Steel Products, Conicals, Tips, Steel Megaphones, Transitions, Reverse Cones

    Only thing is you need a 1-1/2" inlet.....shouldn't be to hard to remedy that.....I can visualize a reverse cone megaphone pipe on the market soon, made by you!

    dnut

     
  3. culvercityclassic

    culvercityclassic Well-Known Member

    Joined:
    Sep 27, 2009
    Messages:
    3,089
    Likes Received:
    59
    Hey Scotto,

    I am working with a company now to produce an exhaust for our four strokes, I am sure the demand is there...
     
  4. LS614

    LS614 Active Member

    Joined:
    Dec 22, 2009
    Messages:
    1,236
    Likes Received:
    0
    culvercityclassic, that 200cc bike is AMAZING, but my only question to you is what cop on the face of this earth would believe it's 50cc? rotfl. Still...I want one too :D
     
  5. Tre_in_L.A.

    Tre_in_L.A. New Member

    Joined:
    May 7, 2011
    Messages:
    32
    Likes Received:
    0
    Super nice looking exhaust system there, CCC Did you braze or tig the muffler piece onto the end of the header? Can't tell too good from pics - Thanks.
     
  6. culvercityclassic

    culvercityclassic Well-Known Member

    Joined:
    Sep 27, 2009
    Messages:
    3,089
    Likes Received:
    59
    Hey LS614

    I do ride the bike around a lot and fear getting pulled over but do have a few get out of jail cards to try and use. My favorite run is from my house to the beach which is about 3 miles one way, nice long stretch to open her up. The other day was a family ride with my kids and they just looked. Gota love L.A.

    Tre

    The exhaust is a combination of mig to hold it in place, tig to finish the joints and brazing on the lower silencer area. Before I had the mig/tig available all my exhaust were brazed. I really like that look and try to mix it up when I can.



    On a note: when disconnecting the low oil sensor I recommend removing the sensor from the case and tapping that hole to seal it properly. I did not do that and now have to pull the motor to complete this. If you chose otherwise it will become a leak. You are warned….
     

    Attached Files:

  7. scotto-

    scotto- Custom 4-Stroke Bike Builder

    Joined:
    Jun 3, 2010
    Messages:
    6,530
    Likes Received:
    6
    Good to know......thanks man, I don't like leaks!

    dnut
     
  8. culvercityclassic

    culvercityclassic Well-Known Member

    Joined:
    Sep 27, 2009
    Messages:
    3,089
    Likes Received:
    59
    I finally got to work on the oil leak today. Tried to complete this with the motor on the bike but it did not work. When I pulled the side case off the cam came out also, so out came the motor. I ended up tapping the oil sensor area with a 7/16 14 and installed a bolt with copper washer. This is a must that must be completed from the start.

    Note: Il am so happy with this motor and the ease to work on...and most of all the TORQUE...this baby rocks
     

    Attached Files:

  9. sportscarpat

    sportscarpat Bonneville Bomber the Salt Flat record breaker

    Joined:
    Jun 25, 2009
    Messages:
    1,751
    Likes Received:
    65
    The motor looks great. Nice job. Nice bike.
    Pat
     
  10. scotto-

    scotto- Custom 4-Stroke Bike Builder

    Joined:
    Jun 3, 2010
    Messages:
    6,530
    Likes Received:
    6
    That engine looks kinda small sittin up like that.......but we know better ;)

    [​IMG]

    dnut
     
  11. msrfan

    msrfan Well-Known Member

    Joined:
    Sep 17, 2010
    Messages:
    1,779
    Likes Received:
    36
    Hi Jeff. Very nice motor. I've got one on a go kart and it runs great in stock form. I like your thoughts on brainstorming and sharing ideas. I was wondering if you were thinking of rigging a recoil starter back onto it. Also, did your motor come with the little compression release on the cam?. And if so, did you leave it on for easier starting? I'm working on a design that allows pedal starting with a Comet Torque-a-verter. If I can perfect it, it would make my life a lot better when I get a Comet on one of my bikes. I don't mind a pull rope so much until I kill the motor and can't bump or pedal start it. Right now my bike just has an autoclutch with a one-way bearing. Works great but I'm stuck with limited torque range. Let me know what you think. Dale.
     
  12. culvercityclassic

    culvercityclassic Well-Known Member

    Joined:
    Sep 27, 2009
    Messages:
    3,089
    Likes Received:
    59
    I have no plans to install a recoil starter on it, kinda like the rope a dope way of starting it. It has no compression release on this motor, its easy to start since this is a low compression motor to start with.

    I am not sure if you can get the coment clutch to work with pedals...it might be a first. The CVT that I have is a GTC brand, works good for now...I think you will really like the operation of the CVT.
     
  13. msrfan

    msrfan Well-Known Member

    Joined:
    Sep 17, 2010
    Messages:
    1,779
    Likes Received:
    36
    Okay, thanks. I checked out the GTC. Looks like the way to go.
     
  14. culvercityclassic

    culvercityclassic Well-Known Member

    Joined:
    Sep 27, 2009
    Messages:
    3,089
    Likes Received:
    59
    Back to post some more updates. I have really enjoyed the ride on this bike but no suspension at high speeds has put some fear in me...so the search was on for some front forks that would look good and perform. Ordered a few online but they turned out to be junk.

    The attached photos are what I have now to work with. I have modified it so it is 3 in. shorter. Tomorrow it will be installed and tested.

    All I can say is ITS ABOUT TIME....
     

    Attached Files:

  15. sportscarpat

    sportscarpat Bonneville Bomber the Salt Flat record breaker

    Joined:
    Jun 25, 2009
    Messages:
    1,751
    Likes Received:
    65
    Those look great, Jeff. Keep us posted. How is the engine surviving running the cylinder upright? I'm guessing you have quite a few miles on it by now. It looks cool with the cylinder in the upright configuration.
     
  16. magrider

    magrider Member

    Joined:
    Aug 24, 2010
    Messages:
    514
    Likes Received:
    1
    Jeff, those forks look great. what brand are they, how much? are they a 1" stem?
     
  17. scotto-

    scotto- Custom 4-Stroke Bike Builder

    Joined:
    Jun 3, 2010
    Messages:
    6,530
    Likes Received:
    6
    Yes indeed, thems fine lookin forks my friend......they look beefy, yet fairly light, kinda old school Manitou-ish with them drop-outs. Could use a pair jus like em ;)

    Gonna make yer bike look sicker than ever!

    dnut
     
  18. culvercityclassic

    culvercityclassic Well-Known Member

    Joined:
    Sep 27, 2009
    Messages:
    3,089
    Likes Received:
    59
    This was my 9/80 day so I had the day off and worked on the bike this afternoon. I installed the new fork, what a huge difference in the ride. I had a problem with the tire bottoming out since I lowered the fork, the beauty of this fork is you can unscrew the top cap and remove or add the spacers inside. Problem solved.

    The bike looks more and more like a motorcycle…just hope the po po don’t see that…lol

    Pat: I do have some miles on this bike and it has had no problems so far, runs like a dream…still amazed at what this motor cost…and the performance.

    I am pretty much done with this bike now. It’s time to move on.

    Magrider: this fork is 1 1/8 head tube and you may be able to make it into a 1”. PM me if you want to know more.
     

    Attached Files:

  19. NunyaBidness

    NunyaBidness Active Member

    Joined:
    Jun 29, 2008
    Messages:
    1,062
    Likes Received:
    1
    Such a beautiful bike, in so many ways. Function, reliability, performance, craftsmanship, everything about this bike is absolutely beautiful.
    I can only imagine how much fun it is to ride.
     
    #139 NunyaBidness, Jul 23, 2011
    Last edited: Jul 23, 2011
  20. culvercityclassic

    culvercityclassic Well-Known Member

    Joined:
    Sep 27, 2009
    Messages:
    3,089
    Likes Received:
    59
    Update: Is the motor reliable? Yes it is. Is the drive train reliable? That’s a good question. The torque is a big factor and is doing a number on the chain.

    Read below:

    Decided to ride this past Sunday with a local group called “Venice Vintage Motorcycle Club”, they do a ride once a month. This ride was from Venice area to a place called Neptune’s Net in Ventura, up PCH 33 miles one way. Now what was I thinking? I know what I was thinking...beach, babes, and biker chicks

    Upon meeting up with this group the feeling was what is this guy thinking. They were all cool people and enjoyed my ride.

    We hit a lot of traffic at the start due to an accident but then the road opened up, at one point one of the radar signs clocked me at 52mph. To tell you the truth it was scary on that 2.5 tire. Made it to the location and really surprised the group. The bike was a hit among all the high dollar machines. Made it 20 miles back then the master link let loose and the chain went flying off the bike. Attempted to pedal it, made it to a restaurant called the Chart House and made the phone call for a ride. Had a few really good margaritas and a shrimp cocktail to end the day. dance1

    I really wanted to complete this venture…but things happen.
     

    Attached Files:

Share This Page