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Thread: Panhead flywheels

  1. #1
    Join Date
    Apr 2011
    Location
    Ontario, Canada
    Posts
    38

    Default Panhead flywheels

    I am sure I am not getting something, I have a few sets of 150-40/150-403 flywheels, but nothing matching that I can ID. I have a few with the 1 1/4" outside taper (both -40's) I understand these to be 74 correct, I have a few with the 1 1/8" outside taper which I understand to be big twin 61 cube. I also have a set that looks to be too small a taper to be even 45 ci with 1" outside tapers...what would these be for?

    Anyone have a spare 150-40 for a 61ci big twin?

    Have I given enough info?

    Thanks
    Craig

  2. #2
    Join Date
    Jun 2010
    Posts
    180

    Default

    Craig,
    The crankshaft and rod shaft machining merge for 61" engines, there is a gap for 74" engines.
    The 36 to 39 engines use a smaller crankpin with smaller tapers.
    Photo 61" flywheels

    61flywheel.jpg
    Last edited by 1950Panhead; 10-15-2017 at 08:41 AM.

  3. #3
    Join Date
    Apr 2011
    Location
    Ontario, Canada
    Posts
    38

    Default

    I will try to take a photo later but mine almost look like they have a tapered sleeve in them to make them a smaller taper.

    Craig

  4. #4
    Join Date
    Apr 2011
    Location
    Ontario, Canada
    Posts
    38

    Default

    I was being a dummy, maybe I should claim I was drunk and somehow part way through looking at my flywheel collection I stopped measuring the crank holes and switched to the pinion holes...

    Still not sure why some of the pinion holes look bushed and some don't.

    And still need a 150-40 61", lol

    Craig

  5. #5
    Join Date
    Nov 2011
    Posts
    24

    Default

    Craig,
    Sent a P.M.
    Tony

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