'12 800 breaking up at high rpm, then died - HCS Snowmobile Forums


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Old 03-19-2017, 08:55 PM   #1 (permalink)
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Default '12 800 breaking up at high rpm, then died

My 2012 xf8 was breaking up at upper rpm.
(9000 miles, riot kit)

After another 30 miles trying to get to the nearest town she gave out altogether, about 2 miles out.
Towed it to town to the very nice Skidoo dealer there and left it as it was 10pm.
Ate a late dinner next door then went out and pulled her over. Fired right up, then quit after twenty seconds.

Hasn't fired since.

Have any of you experienced this with the 800?

Haven't gotten into it, but I'll start with the obvious; plugs, connections, worn wire casings, etc.

I'm thinking coil or stator.

Where would you start?

Any thoughts?
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Old 03-19-2017, 09:02 PM   #2 (permalink)
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Fuel filter as well.
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Old 03-19-2017, 10:02 PM   #3 (permalink)
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No fuel filter. Does have Smart valves in the tsnk, that are like filters, but I doubt that's it. Could be coil or stator, I've seen 3 or 4 higher mileage ones where the solder comes loose and wir s fall off the stator.
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Old 03-20-2017, 12:36 AM   #4 (permalink)
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Sounds a lot like a stator issue
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Old 03-20-2017, 12:57 AM   #5 (permalink)
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Sounds a lot like stator or ECU.
Check the stator first. They do hiccup as they die.
Been stuck in the woods. I know the drill.
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Old 03-20-2017, 04:09 PM   #6 (permalink)
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Thanks for the replies guys.

My first instinct trailside was the stator. I will report back with my findings. But it may not be for a while…
Not a fuel delivery issue, in my opinion. That's usually coughing and sneezing. Over my 43 years I've had enough 3 wheelers, quads, or old sleds break down that you can usually tell if it's fuel or spark.
The symptom in this case was identical to when my stator went on my Tecate-4 250 twostroke about fifteen years ago. Breaks up at high rpm, then slowly breaks up at lower rpms, then kaput..
I'll see what I can find.
Thanks again for replies. Fortunately, I also owned the other sled with me, so he rode bitch, at midnight in 0 degrees on our return to camp.
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Old 03-20-2017, 06:16 PM   #7 (permalink)
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Might want to check your reeds.
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Old 03-20-2017, 06:22 PM   #8 (permalink)
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Not reeds, imo. You could have a reed half missing and a trail sled will still run smooth at wot.
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Old 03-20-2017, 07:06 PM   #9 (permalink)
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Favorite Riding Area: always willing to chase snow
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Quote:
Originally Posted by stronger800 View Post
Not reeds, imo. You could have a reed half missing and a trail sled will still run smooth at wot.

Exactly.
On my '91 EXT, it had a broken reed for a couple years. Blubbery and rough low and lower mid-range, but screamed as always upper mid and top.

It's definitely spark, or lack of.

Having said that, she probably needs a set of reeds, too. Changed out the stock at 4400mi. Boyesens since, but started to smell a little "fuely" down low and at idle. Same as it did when the stock reeds were failing. 9000mi now.
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Old 03-21-2017, 10:53 AM   #10 (permalink)
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Had similar problem on my 12 800. Started breaking up at hi rpms then died. Stator failed. Around 9000 miles on my sled also.
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