When splitting engine cases, the crank main bearings generally stay in the cases, which is where they should be. Oftentimes, however, the main bearings may want to stay on the crank. If this happens, the bearing can be extremely difficult to remove unless you have the right tool.

Picture of the Tusk Bearing Separator

How to Remove the Crankshaft Bearing on a Motorcycle or ATV

Want to see how easy it is? Just take a look at the video below. It demonstrates a step-by-step process to use the Tusk bearing removal tool to remove the main bearing. You can also read the written instructions underneath.

What You Need to Begin

Picture of the Tusk Crank Bearing and Gear Puller Set

You don’t need very much to get the job done – mainly just the Tusk bearing removal tool. You should also have your machine’s service manual handy (as you always should whenever performing any sort of work on it) in addition to a ratchet to help tighten the Tusk tool. And of course, you need to have the crankshaft removed as well.

Position the jaws underneath the bearing.

  1. Open the jaws of the separator tool.
  2. Opening the Bearing Separator’s Jaws

  3. Place them directly underneath the bearing.
  4. Picture of Placing the Bearing Separator Jaws Underneath the Bearing

  5. Tighten the nuts to close the jaws.
  6. Picture of Tightening a Nut on the Jaws

  7. Try to keep the jaws parallel with each other. In order to do this, you will need to alternate between nuts.
  8. Use a ratchet to perform the final turns in order to get the jaws as tight as possible.
  9. Picture of Using a Ratchet to Tighten the Nuts

Position the uprights.

  1. Place the uprights in the holes on each jaw.
  2. Picture of Positioning the Uprights in the Jaws

  3. Screw the uprights into place.
  4. Picture of Screwing the Uprights into Place

Position the holding bar.

  1. Slide the bar into one of the uprights.
  2. Picture of Sliding the Bar onto the Upright

  3. Place the other end of the bar onto the second upright.
  4. Picture of Placing the Bar onto the Second Upright

  5. Center it over the crank.
  6. Picture of Centering the Bar Over the Crank

Screw the center bar to release the bearing.

  1. Screw the center bar down until it sets against the crank. You can just use your fingers at this point.
  2. Picture of Lowering the Center Bar with Fingers

  3. Once it is in position, use a ratchet to tighten the center bar.
  4. Picture of Ratcheting the Center Bar

  5. As you turn the center bar, it will slowly raise the jaws, placing pressure on the bearing and eventually releasing it.
  6. Picture of Releasing the Bearing

  7. Once the bearing has been displaced, you can disassemble the tool and pull the bearing off.


That’s all there is to removing the main bearing from the crankshaft. It’s a simple tool, but it makes a world of difference. As you might guess, the tool also works great for removing any bearing that is fitted directly against a surface in a similar manner.

Don’t have a Tusk bearing separator yet? Pick one up from Rocky Mountain ATV/MC today.

Did you find this tutorial helpful? Share it with a friend on social media.

Technician Disclaimer