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Question about flywheel/magneto removal.

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I recently bought a 1989 KTM exc350 as a trail bike that needed a new magneto. Fortunately, the guy I bought it from had a whole spare engine (minus the piston) with a good magneto that was included with the bike. I need to switch the magnetos, but I honestly have no idea how to use a puller since I've had to switch one before. Can anybody please explain how to use one so I don't ruin my crank?

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Thread the puller into the flywheel. Then thread the center bolt in, it will contact the crank end. Use a large wrench to lock the outside of the puller in place then turn in the center bolt. This will push the flywheel off the crank. Pay attention to reverse threads.

Joe...........

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