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Arctic Cat: 1M 2001-2005, all models in the Mountain Cat / 1M chassis
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Old 02-09-2017, 03:03 PM
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Default King cat backfire

I have an 05 king cat 900 EFI, when i start it up cold it idles for a bit then backfires once and continues to idle fine. I have checked ground wires and connections. I was told a backfire can crack or break the reeds. Anyone know what could be causing this? Engine is stock, power valve deletes, v force reeds, a can and boondocker box.
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Old 02-09-2017, 03:42 PM
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Water in gas
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Old 02-09-2017, 08:56 PM
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I don't think so, it's done it every ride so far this season, and I fuel up before every ride usually around 10 gallons. It's got non ethanol fuel in it right now too.
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Old 02-09-2017, 09:34 PM
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Condensation collects as it cools and warms each day inside the tank, adding water. If you don't proactively remove it with heet or similar product it adds up and backfiring is the result.
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Old 02-09-2017, 11:33 PM
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Ok, never had it backfire last season.... I do add startron every other ride.

Last edited by BigRedRider; 02-09-2017 at 11:36 PM.
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Old 02-10-2017, 06:15 PM
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Anything else I should check? Could it be a tuning issue? Sensor, coil, ect, any other ideas?
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Old 02-12-2017, 04:14 PM
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Try a new set of plugs. I have had brand new plugs that are dead. I have also had plugs that have decent spark outside of the cylinder, but when installed under compression they don't fire and puke, fart and flood and puke out gas from the Y pipe and eventually the pipe.
Check your plug wires too. Those go bad on the older cats. Can even turn off the cap and cut 1/4 inch off so you get nice new wire and turn them back on tight but centered.
FYI.

Last edited by Readymedic; 02-12-2017 at 04:17 PM.
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Old 02-15-2017, 08:43 AM
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Turned out to be a bad spark plug boot wouldn't stay on tight.
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