Ready For Oscar's Final Mod!

Discussion in 'Whizzer Motorized Bicycles' started by Hal the Elder, Nov 20, 2009.

  1. Hal the Elder

    Hal the Elder Member


    I still want to give Oscar an up-swept exhaust pipe, but I'll need a 6-inch length of flexible tubing (like flex conduit) with a 1.25" Inside Diameter to provide a close fit over Oscar's exhaust pipe, which is 1.25" OD. I'll complete the splice with stainless hose clamps.

    The auto-parts stores and muffler shops don't cary any flex pipe that small.

    Any suggestions?

    Old Hal

  2. RdKryton

    RdKryton Active Member

    Have you thought about getting some thin wall tubing and using a conduit tubing bender to get the curve you want? I looked around and didn't find any flex tubing in the size you want.

  3. KilroyCD

    KilroyCD Active Member

    Hal, here's a thought. What is the inside diameter of your echo pipe? We're working with some flex pipe that has an outside diameter of an inch (as we're using one inch seat post clamps to anchor it). How about using the smaller diameter flex pipe as an interior sleeve? Of course, that is if the diameters work. You could cut short slots at 90 degree angles in the ends of the echo pipe so your clamps will be able to tighten it down sufficiently onto the flex pipe.
  4. Hal the Elder

    Hal the Elder Member

    Hey Kilroy:

    I don't know what you mean by an "echo pipe".

    I have an exhaust header from the engine to the muffler which is a constant 1.25" 0.D. See photo.

    I want to cut it about 3" to the rear of the crank hanger and angle it up 15 degrees. I'll make my own bracket for attaching the muffler at its new position.

    I don't know what the I.D. of my header pipe is...probably around 1-1/8", but your "sleeve" idea sounds workable if it can be built up with shim stock to make a tight fit into the header pipe.


    Attached Files:

    Last edited: Nov 22, 2009
  5. KilroyCD

    KilroyCD Active Member

    The "Echo Pipe" is the style of exhaust pipe that is stock on the modern Whizzers, and is the type of pipe "Oscar" is fitted with.
  6. Quenton Guenther

    Quenton Guenther Motored Bikes Sponsor

    Hi Hal,

    I have a roll of Exhaust flex pipe [stainless, I think] that is 1" I.D. and 1.125" O.D., however it won't fit over the larger pipe used on the later model NE motors.

    I don't know the I.D. of the later echo pipe, but if the I.D. is 1" maybe you could use a 1" I.D. piece of aluminum pipe or tubing as an insert to connect the two together.

    If you find time check the I.D. of your echo pipe and maybe I can make it work.

    Have fun,