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Voltage to the positive terminal of the starter while cranking should be between 10.5 and11.8 v while the motor is turning over. If it is less then either the battery is weak or there is possibly corrosion creating resistance and dropping the voltage to the starter. A fully charged battery should have between 12.6 and 13.2 volts

Thanks for the point in the right direction. Sounds like I need to the rotor/flywheel off. Any tips? Surely the rollers / springs can be cleaned up instead of replacing the whole clutch?

Thank you! Will try tomorow.

Added ATV and issue to topic title 😉

Yes, the starter clutch bolts to the back of the rotor/flywheel. It has 3 rollers in it that grab the big gear when turned in one direction but freewheels in the other direction. Usually the rollers and/or springs go bad, allowing it to slip instead of grabbing that big gear.

Looking at these links; https://www.partzilla.com/catalog/yamaha/atv/1991/moto-4-yfm250b/generator https://www.partzilla.com/catalog/yamaha/atv/1991/moto-4-yfm250b/starter-clutch I assume the 'starter clutch' sits behind the generator rotor assembly? Surely the original clutch is still in position and just needs freeing up?

Group ride in April. Lmk if you can make it. Sent from my SM-N920V using Tapatalk