Why Is my sled Backfiring - HCS Snowmobile Forums

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Old 09-24-2009, 10:33 PM   #1 (permalink)
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The last trip to Maine this past season my sled would backfire every time I started it. Its a 99 ZL600 carb. Every time I stoped on the trail and went to restart it would backfire. A wicked loud backfire too. It seemed like it ran normal and started first pull but it just backfires, why???
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Old 09-24-2009, 10:37 PM   #2 (permalink)
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let it idle down under 2k.. mine would do the same thing and letting it idle down helped
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Old 09-24-2009, 10:39 PM   #3 (permalink)
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yeah. thats it. almost every "newer" sled i know of does that.
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Old 09-24-2009, 10:58 PM   #4 (permalink)
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The sled idles high. I have been told in older posts that its the nature of the beast. It idles at like 3200. The sled also has like 6000 miles on it, do you think the backfire has anything to do with a week engine or maybe replace the reeds?
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Old 09-24-2009, 11:00 PM   #5 (permalink)
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Idle that high sounds like an air leak. Carb boots most likely
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Old 09-24-2009, 11:00 PM   #6 (permalink)
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have you tried blipping the throttle? i've read that helps drop the idle then you could probaly shut it off.. i dont know what the cause of the high idle is for i need to read up more on it
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Old 09-24-2009, 11:01 PM   #7 (permalink)
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Engaging the choke for a second will also bring the idle down. That may just mask the problem though
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Old 09-24-2009, 11:05 PM   #8 (permalink)
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Choking should most likely get the idle down, and as said try blipping the throttle. If choking you may cause a bit of grief, my buddies carbs would freeze up after choking to idle down.
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Old 09-24-2009, 11:57 PM   #9 (permalink)
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Quote:
Idle that high sounds like an air leak. Carb boots most likely[/b]
true. spray some carb cleaner (i think thats the stuff) around the carb boots and crank seal while its running. i rpm's change, you got a leak. try playing around with the idle screws too. i can't remember how far they should be turned out from being seated.
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Old 09-25-2009, 08:40 AM   #10 (permalink)
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if i spray around the carb boots is the idle going to drop or go up?
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