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If your 100cc quad makes a grinding noise when you try to start it, or the starter just spins free, the sprag clutch is probably toast.
This one fits a bunch of smaller quads: Apache 100cc, Quadzilla 100cc, Proshark 100.
It's a new part, unbranded but made to fit.
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The sprag clutch (also called a one-way clutch) lets the starter spin the engine but then disengages so the engine doesn't spin the starter.

If it's bad, no starty.
Grab this, pull the side cover, and swap it out.
Cheap fix, back on the trails.

4 out of 5