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dropping a cylinder

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  #1  
Old 01-19-2013
sks70003
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Default dropping a cylinder

i have a 2003 polaris sks 700 and as i was riding it drops a cylinder so i got her home and took the wires off to see what one was dropping and to me it seems like the far one. i just got a new coil for it and ive ckeaned my secondary clutch ive also just put seafoam(carb cleaner) in my tank. but it still drops that one cylinder.. anyone seen this before? any ideas of what might be wrong?
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Old 01-19-2013
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Are you loosing spark or is the cylinder not firing?
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  #3  
Old 01-19-2013
sks70003
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im not sure i think its loosing spark because i unhooked the spark plugs while running and the far one just barly kept it going so im thinking its loosing spark
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Old 01-19-2013
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If you just replaced the CDI check to make sure you spark plug wires are tight at the connections and that you have the right spark plug boot for the plugs you're using. Also, what plugs are you using?
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Old 01-19-2013
sks70003
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the cdi box that i got was directly off of a 03 sks so it should all be the same...im using NGK R's BR9ES
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Old 01-19-2013
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Do you know how to check for spark? Pull the plugs, insert them into the boots and lay them on the head so that they are making metal-to-metal contact with the engine and try to turn the sled over (kill switch off/key on).
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Old 01-20-2013
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Best way is to use an inline spark detector to verify loss of spark.
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  #8  
Old 01-20-2013
sks70003
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i checked the spark was fine but i replaced both spark plugs and it seems to be fine i took it just around the yard...it seems to eat these spark plugs is that normal? I dont know if ive ever had to change plugs in any other sled of mine unless it was flooded or it was time to change them
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Old 01-20-2013
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You mean they just keep fouling out right away?

Check to make sure you throttle/oil cables are adjusted properly and that your oil pump is lined up correctly. I'd also recommend removing the exhaust pipe and silencer to make sure they are not loaded with fuel/debris.
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  #10  
Old 01-25-2013
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If you're having spark plug problems use the right ones for the motor.

NGK- BPR9ES not BR9ES
Champ- RN57YCC
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  #11  
Old 02-14-2013
Steepndeep
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you could have possibly have a broken skirt on that piston. I had a Indy 500 that wouldn't idle on one cylinder unless I pulled on that cylinder's choke cale and that turned out to be a bad crankcase seal which was the result of a bad PTO bearing.
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