It sounds like the closing voltage of the cutout relay might be off a little. That's not a difficult fix, but you need to find someone familiar with adjusting a 3-unit regulator. One simple fix is to raise the idle speed a little, maybe 50-100 RPM faster. Good luck!
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!