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xs650 > > Motorcycle Systems > > Engine > > rpm going up with out doing anything


rpm going up with out doing anything
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smearny
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Joined: Aug 13, 2009
Posts: 88
PostPosted: October 20, 2009, 11:06 pm    Post subject: rpm going up with out doing anything
i wonder if it has something to do,with the exhaust,they don't fit 100% into the head blow some air
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jayel
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Joined: Apr 16, 2006
Posts: 3417
Location: SE Iowa 1974 TX650A
PostPosted: October 21, 2009, 7:52 am    Post subject: Re: rpm going up with out doing anything
hanging, surging idle at low rpm indicates lean condition, air leak at carbs or pipes
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xjwmx
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Joined: Oct 15, 2008
Posts: 323
Location: KY '81 Special
PostPosted: October 21, 2009, 3:00 pm    Post subject: Re: rpm going up with out doing anything
Air leak can also be badly adjusted exhaust valve. Check your valves first thing just in case, because you need to do that anyway.
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