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Less power in cool weather?
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J741
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Joined: Aug 02, 2005
Posts: 11
Location: Calgary, Alberta, Canada
PostPosted: September 26, 2005, 1:33 am    Post subject: Less power in cool weather?
As the temperature begins to drop here, I am noticing that I have less power after the sun goes down. The bike is still useable, but it doesn't sound or feel quite right. I think it may be running too rich or lean, but I am not a mechaninc, and don't know how to tell. Anyone have any suggestions?

BTW, the bike is a 1970 XS1 in which I just recently installed new spark plugs and oil.
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xs650mike
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Joined: Sep 24, 2005
Posts: 130
Location: Lake County, California
PostPosted: September 26, 2005, 8:55 am    Post subject: Re: Less power in cool weather?
Cold air is denser which theoretically will make the mixture slightly leaner but I've never really noticed that I've got less power in cool weather, usually the opposite. I don't know anybody other than drag racers who rejets their carbs for weather changes.
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mo650chopper
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Joined: Mar 13, 2005
Posts: 544
Location: Lonedell, Missouri
PostPosted: September 26, 2005, 11:17 am    Post subject: Re: Less power in cool weather?
You did replace with the same type plug? Usually cooler evening / night / morning air makes a engine run better unless your on the lean side to start. Along the same line as Sea level verse 5000 Ft. elevation. What color on your plug tips?
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