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xs650 > > Motorcycle Systems > > Fuel > > Running lean on right side


Running lean on right side
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engine22
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Joined: Apr 10, 2008
Posts: 104
PostPosted: May 13, 2009, 10:30 pm    Post subject: Running lean on right side
My 78 xs is beginning to run lean on the right side. Pulled the plugs the other day and left one looks good, nice brownish tannish color, but left one had some serious white tint to it. I will post some pictures later of the plugs.
What should I do next, time for a sync?
I am running pods and one size bigger main jet. What is strange is that I have been constantly checking the plugs since rejetting and this is a new occurence. What could cause this?

Appreciate the help.
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tuffbuilt
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Joined: Sep 18, 2008
Posts: 29
Location: Glasgow, Ky.
PostPosted: May 13, 2009, 10:38 pm    Post subject: Re: Running lean on right side
Any trash in the carbs? My 81 has screens in the seat as it comes into the needle. If your bike has this it may be stopping up.
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xsjohn
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Joined: Jul 30, 2006
Posts: 5857
Location: North Carolina USSA
PostPosted: May 13, 2009, 10:42 pm    Post subject: Re: Running lean on right side
That's because the right runs 25 degrees hotter than the left.........

xsjohn
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engine22
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Joined: Apr 10, 2008
Posts: 104
PostPosted: May 13, 2009, 10:47 pm    Post subject: Re: Running lean on right side
So can you sync to compensate for that temp difference?
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xsjohn
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Joined: Jul 30, 2006
Posts: 5857
Location: North Carolina USSA
PostPosted: May 13, 2009, 11:03 pm    Post subject: Re: Running lean on right side
No...........spent 10 years on that subject.......I make right/left needles to compensate for that..............

xsjohn
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engine22
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Joined: Apr 10, 2008
Posts: 104
PostPosted: May 13, 2009, 11:23 pm    Post subject: Re: Running lean on right side
haha so what can I do in the meantime, run different heat range sparkplugs on each side? Will the right always run lean no matter how much I sync with stock needles?
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xsjohn
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Joined: Jul 30, 2006
Posts: 5857
Location: North Carolina USSA
PostPosted: May 13, 2009, 11:28 pm    Post subject: Re: Running lean on right side
Different heat range would effect the plug color but not the cylinder temperature.........nor the leaness as compared to the left......

xsjohn
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Retiredgentleman
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Joined: Mar 03, 2007
Posts: 2258
Location: Calgary, Alberta 1978 XS650 SE
PostPosted: May 14, 2009, 12:09 am    Post subject: Re: Running lean on right side
I would suggest you adjust the air/fuel mixture screws using the "dead cylinder method".

I found that my 78SE runs best with left @ 2.5 turns and right@ 3.5 turns
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xsjohn
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Joined: Jul 30, 2006
Posts: 5857
Location: North Carolina USSA
PostPosted: May 14, 2009, 1:26 am    Post subject: Re: Running lean on right side
Seriously over doing the mix screw on the right will cause loading a lower speeds........and will still leave you lean at higher speeds.........

xsjohn
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