Jim's Primary Drive Locking Block For Harley

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Jim's Primary Drive Locking Block For Harley

Don't break your clutch basket, comp sprocket, or your knuckles by jamming wood or steel up against your sprocket teeth. If you need to lock up your primary (for, say, clutch or primary chain replacement), don't risk busting up your expensive drivetrain components. This little number is a perfect fit for the comp sprocket and the chain, and the polymer it's made of will not mar the components that it comes in contact with. Once you have one, you'll wonder how you lived without it.


  • Used to lock primary for service work
  • Fits between the chain and motor sprocket
  • Works on most Big Twin and Sportster primaries 
  • Made out of black Delrin
  • Made in the USA

Fitment Notes & Exceptions

  • Not for 2007-Up Harley Big Twin models
Product Style RevZilla Item # Manufacturer Product # Availability
Jim's Primary Drive Locking Block For Harley 999011 2234 Available: Requires 1-3 business days lead time prior to shipment


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If your order arrives and it is not right, we will we'll fix it, NO NONSENSE, we promise.

Doesn't fit or just not happy with it? You can return any new, unused and unaltered item within 30 business days of delivery receipt of your item. We will issue a full refund to your original payment method.

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