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    '05 Polaris Super Sport 550

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    • Member since
      March, 2017
    '05 Polaris Super Sport 550
    Posted by Kali7312 on Wednesday, March 22, 2017 2:15 PM

    Hey guys -

    I have an 05 Polaris Super Sport 550. Sleds starts ok (a lot better with new plugs), but does not want to idle, unless given gas. Carb was cleaned and loosened the screws a half turn. Noticed a large noise, similar to a gun shot, that goes off a few seconds after it's started. Any ideas on what the issue is?

    Thanks

    Moderator
    • Member since
      October, 2013
    Posted by Ross Halvorson on Thursday, March 23, 2017 1:05 PM
    The gunshot sound that goes off after a few seconds is from a backfire. That is caused by unburned fuel that is in the exhaust pipe or silencer that ignites there when the exhaust gets hot enough. The cause of it not idling is from being too rich at zero throttle (this ultimately is the same cause as the backfire). To diagnose this, start the engine and run it at idle or just above idle and see if both legs of the y-pipe are getting hot or if one is hotter than the other. This will tell you if one cylinder is extremely rich verses the other one. You can also pull the plugs after idling it and see if one shows wetter than the other and you will know where to focus your efforts. Being extremely rich at an idle can be caused by a number of things, the most common are as follows:
    1)      Stuck or mis-adjusted choke cable. Check the choke cable and make sure there is free-play in the cable when off and that the plungers are dropping all the way.
    2) Low compression. Using a compression gauge, check the engine compression. Low compression from a worn out top end (pistons and rings) can cause it to act rich.
    3)      Leaky needle and seat. Check the needle and seat in the carbs to insure they seal properly when the float bowl is full of fuel. A leaky needle and seat can make it act rich as it will flow fuel continually into the engine.
    4)      Leaky fuel pump diaphragm. If the diaphragm in the fuel pump has a pin hole in it, it will leak fuel into the side that the impulse line is plumbed into.
    5)      Bad plug wire or cap. Inspect your caps for excessive carbon build up on the inside contact point where the cap snaps onto the wire. Clean with contact cleaner or replace the caps and use dielectric grease on the top of the plug to promote a good connection. Screw the cap onto the wire in a clockwise rotation. If it rotates more than 1 ½ turns before coming tight, unscrew the caps and either replace the wires or cut ¼ inch off of the wire and re-install the caps. Inspect the wires for worn spots that can allow the ignition to arc through it. If you have bad wires that are arcing, the resulting intermittent spark will make it misfire and run rich.
    6)      Plugged exhaust. On older sleds, I occasionally run into a mouse nest in the silencer that can cause a partial blockage making the sled run rich. Usually they burn right out, but if the mouse carried nuts, dog food or something else into the exhaust, you may have to clean it.
    There can be other causes, but these are the most likely in order of importance. Some simple troubleshooting should find the problem.
    -Jerry Mathews, Starting Line Products

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