Ski-Doo wobbly clutch patent? - Page 2 - HCS Snowmobile Forums


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Old 04-19-2017, 02:45 PM   #11 (permalink)
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I just thought I'd mention that the clutch isn't actually out of balance...
There is a runout meaning the shiv looks like is wobbling, but its not.

The idea of compensating for engine movement in the power cycle is a promising idea. In theory it would reduce belt stress and temperature, extending life.


Now if it actually works, thats another question...
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Old 04-19-2017, 09:34 PM   #12 (permalink)
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I don't doubt for a second it works great if the wobble is correct, but its harder to tell if the wobble is incorrect vs. if it has a wobble when there shouldn't be one.
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Old 04-19-2017, 09:44 PM   #13 (permalink)
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I don't doubt for a second it works great if the wobble is correct, but its harder to tell if the wobble is incorrect vs. if it has a wobble when there shouldn't be one.
From the info provided the clutch and crank are all indexed the same, meaning the "wobble" is always in the right spot.

Remember its not actually a "wobble", it is round out, so the clutch can still be checked for balance properly.
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Old 04-19-2017, 09:54 PM   #14 (permalink)
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I have a new 850 and when I throttle up to 5900 to 6200 rpm I can hear a distinct out of balance sound coming from the engine/clutch. I have no idea what it is cause I cant simulate it sitting still....wtf!! I hope it doesn't have anything to do with the clutch design! anyone else hearing the noise?? Its annoying as hell and only starts making the noise at between 5900 and 6200 rpm.......
How often to you really ride at that rpm range on a 2s?
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Old 04-20-2017, 08:55 AM   #15 (permalink)
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Sometimes when I'm out in really gnarly conditions, low visibilty etc , I have to spend time in those lower rpm regions. I recall with my good ol' XC800, it sounded like a bag of marbles at that rpm , lol!
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Old 04-20-2017, 10:28 PM   #16 (permalink)
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Yes it is real.

https://www.snowest.com/forum/showthread.php?t=433059


They say it is for vibration dampening and NOT the cause of the blown belts.

They are still investigating the belt issue.....
My 05 800 had .007 run out measured @ the inner primary sheave. It would pulse the belt to death in 6- 800 miles. Since the crank was redone the problem is gone. No more run out.
No wonder they are belt blowers. It pulses the belt to death.

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Old 04-20-2017, 10:56 PM   #17 (permalink)
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My 05 800 had .007 run out measured @ the inner primary sheave. It would pulse the belt to death in 6- 800 miles. Since the crank was redone the problem is gone. No more run out.
No wonder they are belt blowers. It pulses the belt to death.
The run-out is calibrated to be in a specific spot.
The spot is in harmonics with the engine reducing the amount of stress the belt feels when the engine mounts flex during the combustion cycle.

If its not in the right spot like in your 2005 then it amplifies the vibration, and pulls the belt apart.
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Old 04-21-2017, 09:30 AM   #18 (permalink)
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Originally Posted by Manitoba Dragon View Post
The run-out is calibrated to be in a specific spot.
The spot is in harmonics with the engine reducing the amount of stress the belt feels when the engine mounts flex during the combustion cycle.

If its not in the right spot like in your 2005 then it amplifies the vibration, and pulls the belt apart.
Sounds like a belt problem waiting to happen. Is this really necessary or are there deeper issues with that motor?
Seems to me if you get the crank run out right you don t need to do anything else. Hey,but what do I know? I m just a wrench..Not a engineer.
I can understand harmonics as a issue,,,but,, ..
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Old 04-21-2017, 11:16 AM   #19 (permalink)
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Not every 850 has belt issues. Many are going 4000 miles without a problem.
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Old 04-21-2017, 11:43 AM   #20 (permalink)
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Originally Posted by Drumerjb View Post
Sounds like a belt problem waiting to happen. Is this really necessary or are there deeper issues with that motor?
Seems to me if you get the crank run out right you don t need to do anything else. Hey,but what do I know? I m just a wrench..Not a engineer.
I can understand harmonics as a issue,,,but,, ..


Its not necessary at all, but its supposed to be an improvement.
Everything that can reduce vibration is a step in the right direction for the life of a 2-stroke.

They wouldn't have put it on if they hadn't got it figured out first.
Most of the belt problems I heard of were a temp issue, which BRP addressed for 2018.
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