G4 BELT EATER! [2017 Ski Doo 850 Rev G4 clutching/belt fix?] Belt Issues
- Thread starter NWaxys
- Start date
Constistency ... BRP needs to deliver this for their new flagships
Some are not having problems with belts.
BUT....
There are a Significant number of people that are. Significant.
This is clearly not a 'Tempest in a teapot" issue.
For a product from BRP... and their high standards... Belt durability/performance/reliability/efficency needs to be MUCH more consistent and I believe that BRP should make this a priority to make the clutching or possible CVT design changes deliver more consistent performance and reliability across the board.
The solution should come from BRP not only the aftermarket.
This issue actually brings to mind the issues that Polaris had with the 2005 900 RMK's/Fusions... some were not having issues... but there were also a significant number of people that were having issues. Changes to the motor mounts and a monumental improvement in belt design were the solution.
A belt that 'blows' all of a sudden is VERY hard on the crank and other driveline parts.... So this IS a 'big deal'
Also...if the clutching system is so far "out of whack" that it blows belts... that sled is delivering no where near it's potential for performance... much efficiency lost here.
To sum it up.. I hope that BRP is investing their resources into this very real issue... and can deliver a 2018 model to it's customers that will not have these problems. And will retrofit their loyal customers that invested their hard earned money in their 2017 Ski Doo Summit 850's at NO charge.
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Some are not having problems with belts.
BUT....
There are a Significant number of people that are. Significant.
This is clearly not a 'Tempest in a teapot" issue.
For a product from BRP... and their high standards... Belt durability/performance/reliability/efficency needs to be MUCH more consistent and I believe that BRP should make this a priority to make the clutching or possible CVT design changes deliver more consistent performance and reliability across the board.
The solution should come from BRP not only the aftermarket.
This issue actually brings to mind the issues that Polaris had with the 2005 900 RMK's/Fusions... some were not having issues... but there were also a significant number of people that were having issues. Changes to the motor mounts and a monumental improvement in belt design were the solution.
A belt that 'blows' all of a sudden is VERY hard on the crank and other driveline parts.... So this IS a 'big deal'
Also...if the clutching system is so far "out of whack" that it blows belts... that sled is delivering no where near it's potential for performance... much efficiency lost here.
To sum it up.. I hope that BRP is investing their resources into this very real issue... and can deliver a 2018 model to it's customers that will not have these problems. And will retrofit their loyal customers that invested their hard earned money in their 2017 Ski Doo Summit 850's at NO charge.
.
Last edited:
First blown belt at 450 miles.
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Well I am leaning towards another Ski-doo for sure. I guess I'll just wait and keep watching to see if they address the issues or not.
I've had a clutch kit in every Doo I've ever owned. Not always to correct a major deficiency, but Doo always seems to leave something to be desired with respect to mountain clutching. My dealer just gave me a new clutching package (ramps, pivot screws and primary spring) to try out. I haven't had any blown belts, but they said it's better than stock in terms of clutch temps. I'll report back after I've had a chance to try it out.
As for the bulkheads, they break when you tag a buried rock or other hard object while carving, (like this seemingly minor hit captured in Christoher's video: http://www.snowest.com/forum/showpost.php?p=4027151&postcount=137). It doesn't happen when the skis are riding flat, unless you really smack something hard (i.e., where major carnage would be expected). We aren't hearing about the module breakage anymore, because of the deeper snowpack. This will become a "crisis" again at the beginning of next season, unless Doo totally redesigns the S module, which history suggests they won't be doing. Be careful in a thin snowpack and you should be fine.
As for the bulkheads, they break when you tag a buried rock or other hard object while carving, (like this seemingly minor hit captured in Christoher's video: http://www.snowest.com/forum/showpost.php?p=4027151&postcount=137). It doesn't happen when the skis are riding flat, unless you really smack something hard (i.e., where major carnage would be expected). We aren't hearing about the module breakage anymore, because of the deeper snowpack. This will become a "crisis" again at the beginning of next season, unless Doo totally redesigns the S module, which history suggests they won't be doing. Be careful in a thin snowpack and you should be fine.
J
Wapow was the clutching they gave you something from BRP. What's the parts they gave you and what elevation are you at
The clutching they gave me was their own concoction, made up of BRP parts. I don't have it with me now, so can't tell you exactly, but it's the 951 ramp, with a lighter pivot bolt and a different primary spring. It's designed for 3-7k', which is where we primarily ride in WA. They optimized it for clicker 3 at those elevations, which should make the sled perform better than throwing a bunch of weight on the stock pin and running clicker 1.
F
Got these motors pictures of the 850 none of us want to see.. Bad liner, or excessive clearance but not good for 1600kms NA on it..
F
85o doo in self destruction
J
Wapow sounds like they are using that ramp so there will be more weight throughout ramp maybe that will help with heat Keep us posted. Let me know how clutch heat is
Is the plasma coat of iron still intact Fred?
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F
There is some areas that look pretty sketchy.. let's say not something that looks good by any means
Could have been a defect in the Plasma coating then... Please keep us in the loop as to what Ski Doo does for you on this.
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that is the stock set up for mid elevation...
951 ramp
13.3 pin
417127039 sec spring
the 967/16.7 pin, 039 spring set up is only for 8000' and up IMHO...
I run the 968 ramp (mxz) for 0-7000' with 039 spring and 13-20 grams (depending on elevation) click 3-4 7900-8000 rpm max...
plus venting and removal of all felt and lower half of clutch guard-BJ
I
Is the 968 a more responsive ramp then the 951? Just wondering what you found in comparison with these 2 ramps for riding at 4k elevations...
That 951 low elevation setup with a 165-295qrs spring is spot on 7800rpm and far from lazy in pretty deep NYS 3-4 ft heavy snow. Quite impressive actually.
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I
What elevation?
Up to 3000
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Belt number 13 today. 14 is not far behind
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