1997 XCF not holding idle and backfiring... - Snowmobile Forum: Your #1 Snowmobile Forum
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Old 01-28-2006, 11:26 PM   #1 (permalink)
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1997 XCF not holding idle and backfiring...

Been riding this gem for awhile now.lol.The problem I just started having lately is that the sled wont keep running on its own anymore.If someones there to just barely hold the throttle it will keep at idle even if the throttle doesnt feel tension at all.I have tryed new plugs many atimes and tryed putting that gas drying stuff in it.Is it possible that somehow the throttle cable just came loose a little?I would have already tryed to adjust this but I noticed now it has been starting to backfire a couple times like if im spining at high rpms then just let the rpms drop.Maybe the backfiring will stop once I get the idle problem fixed and install new plugs?Thanks for any help.

Ron
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Old 01-29-2006, 01:26 AM   #2 (permalink)
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Usually backfiring is caused by bad plug(s).

But I have a feeling that your ignition may be cutting out. Perhaps your throttle safety switches are failing and causing problems. (built into the throttle lever housing) Those switches are there in case your cable breaks or something freezes when carbs are not at idle.....

If you have a spark tester, hook it inline with the plugs and run the engine. Watch the spark and see if you think it's cutting out.
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Old 01-29-2006, 09:55 AM   #3 (permalink)
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I guess I will have to see what I find out then.I dont know if I have a spark tester or not though.Can I just see by putting the plug on metal and cranking it over or no?How would I fix the switchs?Any help is greatly appreciated as I want to ride again tonight! Thanks.
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1997 Polaris XCF 440 Fan
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1971 Camaro
1967 Mustang

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Old 01-29-2006, 10:02 AM   #4 (permalink)
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Sounds like you have some adjustments to make man...

First, wiht the slef off, check to see that you have about a 16th of an inch between the throttle and the bars when the throttle starts to pull on the cable... if not adjust the cable (if one carb adjust on top of the carb, if more than one adjust where they meat so you dont throw the carbs out of sync.)

If all is good there and the sled still does not idle right then start up the sled and havea buddy help keep it going if nessassary and adjust the idle screw (side of the carb(s)) VERY SLOWLY and have youre buddy let go of the throttle and see if the sled will idle by its self, if not, keep adjusting the screws... I dont usually like to do this my self because I would probably not adjust them evenly and that would cause one cylender to run faster/slower than the other...

I am no expert but I did my best, hope this helps!


Good luck!
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Old 01-29-2006, 07:36 PM   #5 (permalink)
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Run the engine while you are checking for spark. Get (or make) an inline tester and hook it inline with a spark plug and watch the spark as the engine runs and cuts out. See if the spark looks unusual during this. This will rule out ignition problems...or bring them into light.
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