With the flywheel spinning at about 1,000 RPM at idle, the starter, if engaged with the flywheel, would be forced to spin between 15,000 and 20,000 RPM. Once the engine has turned over and is running, the overrun clutch will release the starter from the flywheel and prevent the gears from re-meshing (as in an accidental turning of the ignition key) while the engine is running
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When starting an engine the starter motor turns the crank shaft via the fly wheel at a set speed. Once the engine is running the speed of the flywheel increases above the speed of the starter motor. To stop the starter motor from being damaged once the engine is running a clutch mechanism is used to stop the flywheel turning/ spinning the starter motor mechanism too fast or 'Overrunning'.
Either your starter solenoid, if not check the neutral safety or clutch safety switch.
The clutch start switch is bad.you will find it at the top of the clutch pedal
the purpose is to have a thread holder that connects the thread to the needle
When you hit the starter button the starter relay send power to the starter. the starter solenoid pushes the starter shaft outward and the starter turns. When the solenoid moves the shaft it is connected to the jackshaft which ingages the starter gear on the clutch
It's a real pain. I had to bend the head of a wrench to get at one of the 4 bolts holding it in. If you have the engine out, it's real easy. A lot of times the starter is the not the problem on these bikes. The starter bendix that is behind the clutch is the problem if you hear grinding when you try to use the starter.