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Polaris 500 xc backfiring through carbs, running on 1 cylinder

This sled is backfiring through carbs and it feels like its running on one cylinder. One plug is dark and one looks washed. I just put new gastank,headgaskets,basegaskets,cleaned carbs. Pistons look good and there isn't any blowby.The compression in each cylinder is 120.

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  • Anonymous Feb 27, 2009

    My problem is with a 600 lqiuid cool and she is doing the same thing!We just after putting new oil seels in her and she is still backfireing!

  • Anonymous Mar 30, 2014

    got a 94 xlt snowmobile, got pto bearings done, and it took about two months so put engine in sled and wounld,t start , so cleaned carbs and pump , started but then stoped. plenty spark but gas is going straight threw to base . what is problem

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Timing or cam

Posted on Feb 15, 2009

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DOES THE CYLINDER HAVE LOW COMPRESSION. IT SHOULD BE SOMEWHERE AROUNT 100-130 PSI AND NO MORE THAN 15% DIFFERENCE BETWEEN THE TWO CYLINDERS. IF IT IS LOW, A REBUILD IS GOING TO BE REQUIRED. IF IT IS OK THAN CHANGE THE PLUGS AND DO A CARB CLEANING AND SYNC THEM.

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I have a 2001 polaris RMK 700. It seems to use a lot of gas. It is like it is running on 1.5 cylinders. It doesn't have alot of zip and is real sluggish when it is running. We have gone through the...


Certainly the carbs should be treated as a pair and so when one is suspected both should be checked. The cylinders will be unable to perform equally unless both carbs are tuned equally and synchronised at idle and at various throttle openings.

As part of the checking process it is important to ensure both cylinders are capable of performing equally. A compression test has limited use and a cylinder efficiency test is better. Injecting compressed air into the cylinder would prove the effectiveness of the valve seats and piston rings. A small amount of leakage of the inlet valve seat would make little difference to a compression test but it would make a great deal of difference to the way the cylinder performs.

Another important check is the valve clearances and also the ignition timing if it is adjustable. Some engines with twin ignition systems need to have the timing set for each cylinder.

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you need to have your compression checked. this happened to me and one cylinder was toast. they should be around 120 psi and not more than 5% difference between the two. if not clean the carbs

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Backfires and bogs


put it in a warm garage overnight the other possibility is the timing is out.

Robert

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