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Thread: Motorcycle service starter clutch

  1. #1
    Supporting Member olderdan's Avatar
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    Jun 2016
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    olderdan's Tools

    Motorcycle service starter clutch

    I wanted to be able to start a bike engine while the machine is mounted on a work bench. The kick start is not an option unless you are a giant, so came up with this. After fitting electronic ignition it needs to be strobed to get it correct at full advance which means running up to 4000 rpm while adjustments are made. After researching starter clutches they are mostly based on some form of ratchet or sprag based designs, having had some experience of Torrington one way bearings in use on cylindrical grinding machines namely Jones & Shipman in one of the workhead drive pulleys I decided this would be the simplest approach.
    Based on a Torrington one way bearing powered by a high torque drill. This uses standard inch drive sockets and is reversible end for end if needed so can be used for any motor I am working on. I sacrificed an old extension bar which was too hard to mill so I used my filing rest for the hexagon part which fits in the drill chuck.
    Motorcycle service starter clutch-drg.jpgMotorcycle service starter clutch-parts.jpgMotorcycle service starter clutch-assy.jpgMotorcycle service starter clutch-file-rest.jpg

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  2. The Following 7 Users Say Thank You to olderdan For This Useful Post:

    baja (Jan 5, 2021), Crusty (Jan 3, 2021), jimfols (Jan 4, 2021), Jon (Jan 6, 2021), odd one (Jan 4, 2021), Scotty1 (Jan 5, 2021), sossol (Jan 4, 2021)

  3. #2
    Content Editor
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    DIYer's Avatar
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    Aug 2013
    Thanked 1,557 Times in 1,396 Posts

    Thanks olderdan! We've added your Motorcycle Starter Clutch to our Motorcycle category,
    as well as to your builder page: olderdan's Homemade Tools. Your receipt:

  4. The Following User Says Thank You to DIYer For This Useful Post:

    Manitoba Man (Jan 10, 2021)

  5. #3
    Supporting Member
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    Feb 2015
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    Manitoba Man's Tools
    I like it. I was planning to use the over running clutch from a car starter. Nice to have options.

  6. The Following User Says Thank You to Manitoba Man For This Useful Post:

    olderdan (Jan 11, 2021)

  7. #4
    Supporting Member
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    Jul 2020
    Thanked 28 Times in 15 Posts
    I've been using drills to turn over motors for decades, but this idea makes me wonder why I never thought of something like this.
    Bravo! (and I've been using one-way needle bearings in printing equipment for decades, as well. Why didn't I think of this?)

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  8. The Following User Says Thank You to the harmonious blacksmith For This Useful Post:

    olderdan (Jan 11, 2021)

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