Sprag Clutch Bearing 2005 Sprint St

Discussion in 'Technical Help' started by PhilM, Aug 9, 2024.

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  1. PhilM

    PhilM New Member

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    Hi all
    Any idea where I can get one for a 2005 motor?
    Tried a couple online but they send the bigger one for the upgraded clutch (2006 onwards i think..)

    Thanks for any pointers

    Phil.

    sprag.PNG
     
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  2. sprintdave

    sprintdave Nurse, think it's time for his medications.

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    sprint mfg, not sure but may know where.

    Have the valve clearances been checked? Can cause bad starting.
     
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  3. MightyBoosh

    MightyBoosh Senior Member

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    Generally bearings have a number stamped around the outside-eg 6204 which is a common wheel bearing. Failing that get yourself a vernier caliper and measure inside and outside diameters, and depth. You can cross check these at a bearing supplier to hopefully track down the correct bearing. This will give you a reference to search. Try people like Simply Bearings, they're pretty good. Good luck :)

    BTW is that how the bearing is supplied? I'd have expected it to be contained within an outer race, surely can't go straight into an engine casting like that....
    like these https://simplybearings.co.uk/shop/B...ection=Single+Row+Cylindrical+Roller+Bearings
     
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    Last edited: Aug 10, 2024
  4. PhilM

    PhilM New Member

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  5. PhilM

    PhilM New Member

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  6. PhilM

    PhilM New Member

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    Hi Mr Boosh :)
    Thanks for your reply.
    Its not a roller bearing..its a one way clutch. It allows drive from the starter to turn the crank but once running the crank freewheels inside it.

    Phil
     
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  7. speeder

    speeder Noble Member

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    A sprag clutch bearing is completely different from an ordinary roller bearing, the rollers are an eccentric shape designed to transmit drive in one direction only,( the starter can turn the engine but not the other way round) they are a special item not usually supplied by bearing factors.
     
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  8. MightyBoosh

    MightyBoosh Senior Member

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    Fair enough. You can't win a coconut every time l guess. I wonder who makes them then....?
     
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    Last edited: Aug 14, 2024
  9. speeder

    speeder Noble Member

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    The last one l bought was for an apprila 650, can't remember the price, but an identical item for a BMW f650 was much cheaper!
    In my experience they come as part of the starter clutch assembly,l cannot confirm who actually makes them but I'm pretty sure they are "bought in" by motorcycle manufacturers.
     
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