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101 Crankpin

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  • 08 Feb 2025 1:47 PM
    Quote
    Message # 13460727
    Nick Moss

    Hi All,

    Can anybody out there tell me the crankpin diameter for a 101. I can't seem to find it in the R&O.

    Many thanks...
  • 09 Feb 2025 4:40 AM
    Quote
    Reply # 13460841 on 13460727
    Ken Lee

    Hello nick ,
    The pin diameter is 1 inch . If you look on Jerry Greers site he shows many  good diagrams of Indian parts including 101's , great site for checking measurements and what stuff looks like . He has them listed and also think IPE has them too . Ken

    1 file
  • 09 Feb 2025 11:28 AM
    Quote
    Reply # 13460907 on 13460727
    Nick Moss

    Thanks Ken. I looked there and saw that - Mine measures 0.860" which is exactly why I asked... I'm confused!
  • 09 Feb 2025 9:20 PM
    Quote
    Reply # 13461037 on 13460727
    Tim Raindle (Administrator)

    Hey Nick, 45 is 1", 37 7/8"
  • 10 Feb 2025 2:44 AM
    Quote
    Reply # 13461087 on 13460727
    Nick Moss

    Thanks Tim...
  • 10 Feb 2025 2:49 AM
    Quote
    Reply # 13461088 on 13460727
    Nick Moss

    Tim,

    Is the flywheel assembly the same for 45 & 37 apart from the crankpin?

    I'm wondering if I have a 37 flywheel, but I need a 45!!!!!

    Cheers,

    Nick
  • 10 Feb 2025 5:23 AM
    Quote
    Reply # 13461106 on 13461088
    Philip Jenner
    Nick Moss wrote:

    Tim,

    Is the flywheel assembly the same for 45 & 37 apart from the crankpin?

    I'm wondering if I have a 37 flywheel, but I need a 45!!!!!

    Cheers,

    Nick

    Yes  that is the 37Ci   flywheel  crankpin
  • 10 Feb 2025 8:14 AM
    Quote
    Reply # 13461130 on 13461106
    Bob Sneberger
    Philip Jenner wrote:
    Nick Moss wrote:

    Tim,

    Is the flywheel assembly the same for 45 & 37 apart from the crankpin?

    I'm wondering if I have a 37 flywheel, but I need a 45!!!!!

    Cheers,

    Nick

    Yes  that is the 37Ci   flywheel  crankpin


    Hello Nick:

    I feel like this conversation started in the middle.  So you got your hands on a set of flywheels and you’re not sure if they are 37 or 45 due to the crank pin size?  I guess if it was me, I would measure the stroke on the flywheels to determine 37 or 45 and go from there.

    Best of luck.


    Peace, Bob
  • 10 Feb 2025 8:32 AM
    Quote
    Reply # 13461137 on 13460727
    Tim Raindle (Administrator)

    Nope,shorter stroke on 37. So you will need 45 flywheels. Truett and Osborn make good ones, I use a Greer crankPin with them, and find I need to mill approx 0.090" off internal boss where  nuts sit to allow clearance for con rod shoulder. They are also 10lbs each,whereasdo originals are 8.5lbs. Many people prefer this sport scout weight, more torque, but I like the smoother, faster spin up of a lighter wheel. Easy to turn them down to 9lbs each, but balancing a little more work.Next pair I do will experiment further.
  • 11 Feb 2025 1:35 AM
    Quote
    Reply # 13461582 on 13460727
    Nick Moss

    Awesome. That explains every thing. Thanks Tim.
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