Hi, I have a 1982 kawasaki kz750. The starter spins free 80% of the time and barely completes one compression the other 20%. I replaced the motor with a spare with only a slight change in the noise.
Could a starter problem be the cause or is it likely an internal gear?
Rob
Starting motor grinds!
Starting motor grinds!
Robert Hussey,
St. John's NL
St. John's NL
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Sounds like it's an internal gear, since you've already tried swapping the starter... Some bikes allow access to the starter clutch and gears simply by removing a side cover. Hope this is the case for you 

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