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Old 04-19-2011, 09:02 AM
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The_Aleman The_Aleman is offline
Motorized Bicycle Elite Member
Join Date: Jul 2008
Location: el People's Republik de Kalifornistan
Posts: 2,658
Default Re: motor making a loud whirring sound?

Pull the RS engine cover off and check that you have enough clearance around the big gear. Sometimes they can rub. Also put some grease on those gears and keep that pin n ball behind the cover under clutch release arm nice and greezy.
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