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1996 Polaris ultra spx 680

Tuning

 
 
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  #1  
Old 02-06-2011
Formula plus123
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Default 1996 Polaris ultra spx 680

Having a hard time keeping all three cylinders firing when its warmed up. When its cold it runs fine but for some reason when its warmed up only one cylinder will keep firing and its the center cylinder? The stater, solenoids, CDI all have been changed. Cant figure this dilemma out. The carbs have been rebuilt also. Does anyone have any input on what else could be wrong. Any input would be great Thanks
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  #2  
Old 02-06-2011
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Possible coil breakdown when warm.
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Old 02-06-2011
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Coils have been replaced. Thats what we thought also but still doing same thing
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Old 02-06-2011
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Have you used an inline detector to check for spark?
The other option is the lack of fuel, crank out of phase, bad crank end seals.
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Old 02-06-2011
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No we have not used an inline detector but they checked that at the repair shop and found that the 2 coils were bad so we changed them all with used ones. As far as lack of fuel the 2 out side cylinder plugs are wet from fuel. We will check the crank seals to see if they are bad. Thank you very much for the input
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  #6  
Old 02-06-2011
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what is the compression? I have been told a good motor will be 125psi.
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