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running on one cylinder with fuel and spark

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  #1  
Old 01-08-2011
tx71nova
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Join Date: Dec 2010
Location: ham lake,mn
Posts: 20
Default running on one cylinder with fuel and spark

i tried getting my moms sled running, its the same as mine a 2000 polaris 500 xcsp but hers is stock.

it hasnt ran in 4 years, i cleaned the carbs, greased everything, cleaned the v.e.s., and a pair of new plugs.

it started up but it is only firing on one cylinder.

both cylinders have spark

i pulled the plug after running it and it was wet

so there is fuel.
iv pulled the carbs apart 4 times and checked eveything it looks good and clean in the carb

so how is it only running on one cylinder when both have fuel and spark??
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2000 polaris xc sp 500 with 144 track with WPS rail extensions, custom tunnel extension, boost bottle, dial a jets, 4 inch handle bar riser and bar hooks, extra idler wheels and custom mounted led atv tail light and custom gas can holder
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  #2  
Old 01-08-2011
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snake61047
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Default

Have you checked the idle set screw on the carbs. It might be out of sync since they were cleaned
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  #3  
Old 01-08-2011
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Powersledder
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Default

Rings could be gummed up and stuck causing it to have low compression.
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  #4  
Old 01-08-2011
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Default

^^ Yep check compression...
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  #5  
Old 01-08-2011
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Default

stuck rings or
did you pressure check the needle and seat in the carb?
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  #6  
Old 01-08-2011
tx71nova
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Location: ham lake,mn
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it has 120 psi of compression in both cylinders and the idle screw hasnt been moved since it was ran last, i tested the needle and seat and they are fine.

any other ideas??

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okay i found the problem, the needle was bent and stuck up so it was dumping a ton of fuel in it idle
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2000 polaris xc sp 500 with 144 track with WPS rail extensions, custom tunnel extension, boost bottle, dial a jets, 4 inch handle bar riser and bar hooks, extra idler wheels and custom mounted led atv tail light and custom gas can holder
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  #7  
Old 01-09-2011
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comeon snow!!!!!!!!!!
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I thought it was a fuel issue. Glad you found it.
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