Mounting issues-- frame too thin

Discussion in 'Frame Mounted Engines' started by Snarfu, Apr 26, 2012.

  1. Snarfu

    Snarfu Member

    I had hoped that with proper torquing, my motor would mostly stay put on my road bike with it's puny tubes. Unfortunately there is so much room left in the mounting brackets that I've still got a ton of lateral movement. This is causing my motor to shift to the left during every ride and before I know it, my left pedal is scraping the magneto & clutch covers.

    I've wedged a bit of rubber hoping to keep it shifted to one side, but there must be something better I haven't thought of yet. Any one have this problem?

  2. Lunardog

    Lunardog Member

    Could you supply a couple pics of the mount areas so we can see what you are working with. Im sure you will get lots of ideas.
  3. Al.Fisherman

    Al.Fisherman Active Member

    Options..if it's a HT. Shims can be used on both sides of the tube, front and rear. Look through the album and there are tips to engine mounting.
    [​IMG] [​IMG] [​IMG] [​IMG] [​IMG]
    Last edited: Apr 26, 2012


    I have never had an engine that fit the tubes just right. I have used every thing from a thin shim of rubber cut from an old inner tube to about a 1/4" thick cut from automotive A/C hose. Just wrap it around the tube ( I glue it ) and clamp the engine on. I feel using rubber also helps with vibration.
  5. Al.Fisherman

    Al.Fisherman Active Member

    The general consensus on the forum is that it doesn't help. But there are those that swear it helps. Me I want a rigid mount, no strain on engine mounting studs.
  6. HeadSmess

    HeadSmess Well-Known Member

    never use rubber.

    it makes the vibration WORSE. until i see a proper 3-point mount with some basic engineering applied, anyone that says otherwise is talking :poop:

    instead of restraining the engine, you let it do its own thing in an uncontrolled fashion. dont do.

    use copper pipe like in Al's piccy, or a piece of steel, etc, etc... it has to be solid.

    i weld my mounts on, no matter what. that or braze. dont rely on a dodgy unfitted clamp...
    Last edited: Apr 27, 2012