Stomp start or solenoid-powered? Either way, the nose cone needs to be removed from the starter. You don't necessarily have to do a full teardown, but it might be a good opportunity to check the condition of the brushes and bushings, and replace them if necessary.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!