muffler

Discussion in 'Motorized Bicycle General Discussion' started by MatCauthon137, Jun 23, 2009.

  1. MatCauthon137

    MatCauthon137 New Member

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    Ok, my first build is going great. However...here is my problem. First the motor mounts (outside) broke while I was mounting the motor, so I had to improvise with some metal clamps. Next I found I did not have enough clearence for my muffler from the pedals. The first thought was to find a longer spindle, but I have one of the longest I can find, and the only one that I can find that is longer only gives me a few millimeters more clearence, not enough. Next, I figured I can just heat up the muffler using a welding torch, and bend it a few degrees. That should work, except I don't have a welding torch or anything else I can use to heat up the metal. Querry: Is there anyplace you guys know of (Midas, Meineke, etc.) I can take this muffler and have them bend it for me?.kick2.
     
  2. skyliner

    skyliner New Member

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    if you get the bike started and running it will heat up the header just take your foot (with a shoe on) and bend it should be ok
     
  3. Finfan

    Finfan New Member

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    You can clamp the muffler flange in a vise and use a propane torch to heat the pipe and bend it. Ace hardware sells the torches and 6mm "all thread" that you can cut to length and use as studs for your motor mounts and manifold attachments. Most auto muffler shops probably won't deal with a pipe that small

    My favorite self quote from my first builds is: "6 hour install....my fuzzy butt!!!!!!"
     
  4. chrisme

    chrisme New Member

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    I just heated it red hot with a blow torch and bent it with a pair of monkey wrenches.
    I wouldn't try to bend it while connected to the bike, you may break the studs or something. That idea is full of a lot of fail...
     
  5. Forbisher

    Forbisher New Member

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    DO NOT TRY THIS!

    You will break the aluminum barrell where the exhaust studs screw in

    Bend the exhaust off the bike using a vise
    Bolt the manfold flange to something sturdy and clamp that into a vise
    Then heat and bend

    Small bends can be made cold
     
  6. skyliner

    skyliner New Member

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    well ive built 32 bikes and about 15 out of those the muffler had to be bent and thats how i did it and its always worked fine so dont take my advice thats fine somtimes you gotta take chances
     
  7. Ocean7

    Ocean7 New Member

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    I had a similar muffler clearance problem when I mounted my engine. What I did was I mounted the engine slightly rotated outwards to the side (the top of the engine would move out by 1 or 2 degrees towards your left leg if you were sitting on the bike) which brought the muffler inwards, closer to the frame giving clearance for the peddles. Made sure I corrected the level of the carburetor again so that it sat level again. Not sure how much more clearance you are needing, but it seemed to work well for me.
     
  8. Junster

    Junster New Member

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    If you can't get it hot enough with a propane torch just buy a Mapp gas bottle for your propane torch. You can get it yellow hot and bend it easy then. I just had the same problem with a cruiser build, I just straightened out the curve a few degrees and painted the pipe header black. I'm with Forbisher do not bend it attached to the motor.
     

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