my 2016 800 went down... anyone know why? - HCS Snowmobile Forums

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Old 03-15-2020, 09:00 PM   #1 (permalink)
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Default my 2016 800 went down... anyone know why?

So I was on my last ride of the year with the boys and I lost all power and seized her up. Well we threw her in the truck and brought her home.

So I pulled the plugs and one was covered in aluminum and the other wasn't. The clutch side piston was melted off on the exhaust side.

I have included some pictures of both pistons and plugs. ...the pistons are on my inspection camera and aren't the greatest but you will get the idea.

The trails were a little thin for snow but I kept dipping of trail here and there to grab some snow and never saw over 142 degrees

My 4 year engine warranty ran out the end of December and I am hoping my dealer can help me out with polaris with a possible good will extension. I only have 6700 miles on it, that is why I havent taken anything apart

the dealer always brags to me that they have a lot of customers that have over 10,000 miles on these with no issues. I guess I wasn't one of them...

top 2 pics are the clutch side
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it's too bad he had to run out of talent half way through the corner....
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Old 03-15-2020, 09:09 PM   #2 (permalink)
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Lean burned on the pto. Crank seal , clogged injector, torn intake boot etc. almost 7000 is a lot of miles on a 2 stroke. I always push guys to tear them down at or BEFORE 5000.
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Old 03-16-2020, 07:28 AM   #3 (permalink)
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fuel pick-up sock should have been replaced twice in 7000 miles? lean burn down is form either to much air( air leak ) or to little fuel ( dirty injectors, plugged fuel sock, etc.)

what fuel mode were you in? what octane fuel in the tank? have any det just before this happened? one thin i noticed with redistricted fuel system is its always the pto side tat burns down? mag side injector is feed first?

injectors need to be sent out for testing/cleaning. i bet you will find 5-7% restricted ? if running in the premium mode your 10% + down. this would be way to lean.
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Old 03-16-2020, 08:13 AM   #4 (permalink)
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My Gfs IQ 700 did the same thing at 7500 miles. When tearing it apart I found one of the injector Rubber o rings had cracked and split on PTO side.
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Old 03-16-2020, 09:27 AM   #5 (permalink)
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What Rick said.

I've been finding a fair amount of bad injectors, lately!
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Old 03-16-2020, 09:34 AM   #6 (permalink)
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Quote:
Originally Posted by northstarrick View Post
fuel pick-up sock should have been replaced twice in 7000 miles? lean burn down is form either to much air( air leak ) or to little fuel ( dirty injectors, plugged fuel sock, etc.)

what fuel mode were you in? what octane fuel in the tank? have any det just before this happened? one thin i noticed with redistricted fuel system is its always the pto side tat burns down? mag side injector is feed first?

injectors need to be sent out for testing/cleaning. i bet you will find 5-7% restricted ? if running in the premium mode your 10% + down. this would be way to lean.
I was in 91 mode and running premium always. no DET and never have changed the sock. I am going to request that the engine gets leaked down before anything gets torn apart...to verify if there are any leaks. but from what i have seen so far leads me also that something went lean for sure.
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it's too bad he had to run out of talent half way through the corner....
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Old 03-16-2020, 09:52 AM   #7 (permalink)
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Quote:
Originally Posted by ogrant View Post
Quote:
Originally Posted by northstarrick View Post
fuel pick-up sock should have been replaced twice in 7000 miles? lean burn down is form either to much air( air leak ) or to little fuel ( dirty injectors, plugged fuel sock, etc.)

what fuel mode were you in? what octane fuel in the tank? have any det just before this happened? one thin i noticed with redistricted fuel system is its always the pto side tat burns down? mag side injector is feed first?

injectors need to be sent out for testing/cleaning. i bet you will find 5-7% restricted ? if running in the premium mode your 10% + down. this would be way to lean.
I was in 91 mode and running premium always. no DET and never have changed the sock. I am going to request that the engine gets leaked down before anything gets torn apart...to verify if there are any leaks. but from what i have seen so far leads me also that something went lean for sure.
16's were known for bad crank seals. My buddies 16' did the same thing end of last year. It was the crank seals. He had a new engine put in under warranty. 4500 miles.
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Old 03-16-2020, 10:11 AM   #8 (permalink)
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look for signs of oil behind primary clutch and on the bottom of the belt guard thats where i noticed it when my 16 sb started to leak
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Old 03-16-2020, 12:09 PM   #9 (permalink)
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Quote:
Originally Posted by Frankie406 View Post
16's were known for bad crank seals. My buddies 16' did the same thing end of last year. It was the crank seals. He had a new engine put in under warranty. 4500 miles.
Quote:
Originally Posted by rrallon View Post
look for signs of oil behind primary clutch and on the bottom of the belt guard thats where i noticed it when my 16 sb started to leak
ill be sure to check that, thanks
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it's too bad he had to run out of talent half way through the corner....
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Old 03-16-2020, 01:44 PM   #10 (permalink)
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Agree. My seals were replaced under warranty.

Quote:
Originally Posted by rrallon View Post
look for signs of oil behind primary clutch and on the bottom of the belt guard thats where i noticed it when my 16 sb started to leak
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