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Arctic Cat: M Series 2005-2011, all models in the M-series chassis
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Old 02-05-2019, 10:25 PM
durangorider durangorider is offline
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Default Engine failure

Could I get some insight on what caused this. It's on a 09 m8 with only 980miles. Had a slight pop noise then died. And couldn't get it to stay running after that.
https://photos.app.goo.gl/w7aockG2kt31QHNU9
https://photos.app.goo.gl/Z7FTBgADXkDyZrMD7

Last edited by durangorider; 02-05-2019 at 10:32 PM.
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Old 02-06-2019, 11:06 AM
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Way too hot. A lean condition IMO.
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Old 02-06-2019, 07:29 PM
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The piston wash doesn’t look like it was lean... I would check to insure something didn’t get ingested into your in-take. To me, it looks like something was banging around and thus you have indentions in both your head and piston. If it was a lean burn, you would have scaring on your clyinders.
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Old 02-06-2019, 07:42 PM
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Any ring bits get in there?

Almost looks like some rod bearing indentations too.


Pull the jug and see what's up with the rods. If that didn't have something metal break loose, that's some seriously nasty det.
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Old 02-06-2019, 09:04 PM
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I would guess a broken piston skirt. Let us know who wins
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Old 02-07-2019, 02:24 PM
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I have had flakes of aluminum on the head and pitting, on carbed sleds..
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Old 02-10-2019, 07:48 AM
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Definitely a foreign object got into the cylinder. Probably a broken ring. I wouldn't think a skirt broke with only 980 miles. But a ring could have been stuck from the sled sitting a long time. That would kinda make sense with that few miles on it.

Last edited by snoluver; 02-10-2019 at 07:53 AM.
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Old 02-10-2019, 10:09 AM
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Default by the looks

most of the time when I've fixed arctic cat motors with this look its the result of DETONATION and its been going on for some time, maybe 50-100 miles, maybe since new.

the most likely cause is lean fuel air mixture causing the toooo lean fuel mixture along the outer edge of the piston to explode with a bang instead of the ideal soft push ( technical term as pointed out detonation/deto ), most likely an air leak. Seals on these engines don't go bad sitting for that length of time. Air leak from base gasket very likely, loose stud bolts/nuts. Leaks around the reed valves/reed cages, blown a few belts, crank seals with belt threads stuck in them.

Just a little detonation now and then for 900 miles will anneal the piston crown which allows the ring lands to widen and the rings to flutter and not transfer heat off the piston crown, then under a load in the rpm range where the deto is the worst , a ring end may weld itself to the piston wall for a mili second, break off and go around through the transfer ports and dingle up the outside edge of the piston.

However I would expect when you pull the piston, you will find rings intact, skirt intact. When the center of the head shows little or no scaring, the outside edge of the piston is eroded from little bits of aluminum becoming liquid for a moment and bounding around . The pop you heard was the last straw, not the start of this problem.

Timing could cause this, but the timing on these motors is same for both pistons, one good piston one bad piston, rule out timing.
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Old 02-10-2019, 11:28 AM
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if it sat for a long time I hope you drained the old gas out of it!
If not you can get det and this can break off the ground strap on the plug and this will leave the little J marks on the piston top.
did all the plugs have the ground strap?
did you drain the old gas?
where any of the plugs loose?
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Old 02-10-2019, 05:08 PM
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Old 02-11-2019, 10:30 AM
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Old 02-11-2019, 06:22 PM
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Old 02-13-2019, 06:21 PM
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