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Belt problems with Xp

Brotha NOS,
I'm pretty certain my dealer isn't going to know about this one and would love to know more details regarding this. Do you know if it is a "recall" or "service bulletin"? Will this be on BRP's penny or is the owner of the sled going to have to pony up for this?


Thanks,
-John


It won't be a recall unless it's safty related.
 
Ski-doo announced a recall on gearing the 154 down to a 19 on the top to replace the 21. This is supposed to correct the belt problem. Check with your dealer.


When was this anounced?

I had heard the same thing but when I called dealer last week they said they hadn't heard anything about it.
 
Hello:

I would go to a bigger bottom gear before I ran a smaller top gear.
That is one long chian to pile up and will take out more parts with it
when it goes.
As well you would think 21-45 should be plenty low gearing.
hope this all gets worked out.
Alan
 
XP Belts ?

We have two XPs 154 Xs. Cleaned the clutches on both. One had a issue the first day with the belt slipping and leaving the ring around the tub. There was a guy who was talking on DooTalk or Snowest ,i can't seem to find it but he mentioned the secondary bronze bushing was super soaked from new with oil. He kept cleaning his secondary clutch and his belt issues stopped. We did the same thing on my friends X and he put a new belt on it and the thing has been perfect since. Maybe this guy was on to something. What do you think.

Who really wants to gear down ?
 
I posted on dootalk about the oil lite bronze bushings in the secondary. I have not had an opportunity to ride my long tracked TNT yet.

I know about these bushings from putting hundreds of them into Yami Phazers, Exciters, and V-Max 4's many years ago.

When I finally recieved my Dalton sec clutch tool for the QRS sec and got it apart I discovered the oil lite bushings and just sitting there in my shop the shaft was covered with a fair amount of oil. Unless these bushings have changed a great deal from 15 to 20 years ago they are full of oil and some are just super full.

When you ride the sled the centrifugal force slings the oil out of the inner bushing onto the sheeves (a few guys have mentioned finding oil in this area and on the inside of the clutch cover). For the first few rides just keep cleaning and I have always used acetone and lots of paper towels until they show clean.



I don't think this is the whole problem but bet its part of it, have also heard the lower geared 163's are having less issues. Heard the racers may be going to the QRS sec because its making more track HP than teams (1 or 2 HP) and a bunch more than old doo sec like doo claimed (6 or 7 HP), so I'm pretty excited about this new sec for my lower HP TNT!!! Also know that Shockwave is making one of their adjustable helix's to fit the QRS which would be sweet to be able to adjust from 34 to 50 with the sec on the sled.

Here is another thing I finally remembered to check out. The left and right side motor mounts front and rear are different part numbers on the 600RS from the 800R or 600SDI, the urethane bumper for the torque stop is the same part number. I think Cudney over on dootalk had posted before that a supposed fix for belt issues was a solid left rear mount or solid plastic torque stop.

Good Luck
 
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I talked with my dealer today and asked about the reall on the gearing. He said it is not actually a recall or service bulletin, It is a what Skidoo is classifying as a DEEP SNOW SUGGESTION. If you spend a lot of time in Deep Powder they suggest that you gear down from the 20 on top to a 19. So guess who pays for that one.


Can anyone provide/post a copy of this printed material from Ski-Doo? I would like to have a copy of it for my own records.

Thanks,
-John
 
no belt probs here.

ran about 50 miles on the first ride with no cords showing. consistently hitting 83 and 8400 rpm's on clicker 1.... switched to 2 and it didnt really doo a thing. didnt have excessive heat on the clutches...... but. we were only riding in about a foot of snow on the road.
 
My Dealer

The guys at my dealership said they haven't even heard of any belt problems and denied that it was even possible. I am going to have fun trying to get them to help. They even said that the grip warmer thing was a rumor.
 
the blame game - dealers versus manufacturer...

http://www.snowest.com/forum/showthread.php?t=41486

i must tell you, i would be more suspicious of the monkeys setting up your machine, than the machine itself at this point. BRP dealt with a clutch issue of large magnitude last year. i am hard pressed to believe that they will F that up again. i am not an expert. this is my opinion. (wish half the keyboard jockeys around here would disclaim like this)

see you on the snow.
 
http://www.snowest.com/forum/showthread.php?t=41486

i must tell you, i would be more suspicious of the monkeys setting up your machine, than the machine itself at this point. BRP dealt with a clutch issue of large magnitude last year. i am hard pressed to believe that they will F that up again. i am not an expert. this is my opinion. (wish half the keyboard jockeys around here would disclaim like this)

see you on the snow.

dude have 4 belts blown in 250km no bs! no did not blow the first one on one ride but at the end of the second it came apart, same on ride 4, ride 6, see a pattern, and yes going back to dealer for round# 3, talk to us in 3 rides youll see. ask t/a said same as you just did now hes blowing belts to!
 
Breaking in a belt properly in the mountains is nearly impossible. Just my experience.

I break my new belts in BETWEEN the climbs and change back to the properly breaked in belts when pressing it again, that way you always have good breaked in belts when needed. No fun getting stuck with a blown belt, put a new one on and hammer it to get away and up again and realize the new one wont last for many miles, too expensive for me anyway.
 
BTW anyone ever tried yammi rx1's clutches, they does'nt seem to have so much problems with blown belts even with 300+hp.
Tra's are hard on the belts, I think no one can disagree with this fact and the belts are way to expensive for us to change. BRP should put some energy solving that kind of probs first instead of focusing on sale as many new units as possible. Sometimes it feels like they dont care about those who put big money in previous models and still have'nt solved issues like clutching.
A belt over here in Sweden is about 200$ and it's a to big cost during a season with maybee 5-10 changes.:mad:
 
Here is an old IndyDan thread from March 2006 on the Team Secondary which has three things in common with the new QRS two roller post and larger OD helix like the QRS and compression only spring. Its about 50 or 60 pages long and very deep for me, not being a clutch expert but my gut instinct is it has some good clues that may apply to the QRS/TRA.

http://web.archive.org/web/20060317...etalk/messageview.cfm?catid=3&threadid=252783

Here is part of the first page:

"Title: Polaris Industries must be on crack, 900 TEAM Clutch problem solved.
Created On Fri March 10, 2006 10:24 AM


indydan
Senior Member

Posts: 4287
Joined: Dec 2001


The 900 sure has some issues, Clutching being just one of the few.

Clutching 101 - Here is a short prospective in clutching that should shed some light from a NON engineer view point. Oval Aaen's clutching book explained for the working man.

Ok, This is some of what is happening to the 900.

Of course we all know that the drive and driven clutches need to work together as much as possible, So to help you understand what is happening with the 900.

Imagin driving down a flat trail at 60 mph, Now that being said, Lets pretend that there is no hood on the sled and no clutch cover so we can watch the clutches.

Now at 60mph the belt is going to be about 1/2 way up the drive clutch, And 1/2 way down into the driven. That being said. Now if you start to go up a small long hill and the throttle speed is held at a constant position, what you will have is a constant force coming from the drive clutch, and the driven clutch will start to feel an increase load on the jackshaft, And being that all drivens are created somewhat equal in the torque sensing area, The driven will start to close and force the belt out or " up " and it will pull on the drive clutch causing the belt to go down in the drive clutch I.E. into a lower gear ratio to help keep the motor in its power curve - SHAZAM!!!!!!! The "CVT" Constant Velocity transmission. This is called backshifting.

Now that was a sample of what happens to the driven clutch when torque is applied from the jackshaft side of the clutch.

Now lets imagin that exact same situation - Driving down the trail at 60 mph watching the clutches..........Now the trail is flat and throttle speed is constant again. Now while watching the clutches at 1/2 shift Punch the throttle wide open, What needs to happen now is the belt needs to instantly start to go up in the drive clutch and down in the driven clutch, This would be called upshifting in both clutches.

Here is where you will learn why belts BREAK sometimes with improper clutch set-ups.

What is happening in the polaris 900 is this, When you punch the throttle and the drive clutch tries to close & upshift,
For a instant the driven clutch is trying to close also, In other words, The driven is trying to backshift when the drive is trying to up shift.. Consiquently stretching and breaking the belt in 1/2.

This is a TEAM clutch issue, And the hard part to understand about this for most tuners that have always been " OK " in the clutch tuning area and are pretty sure they know how to tune a set of clutches because they have worked alot with both Polaris & Cat drivens and understand the difference in helix angle from the Cat to the Polaris driven being about 13 degrees different and will shift about the same.

There is a delicate balance in clutching to get a drive a driven to work together, To get them to upshift fast as possible and yet still backshift as fast as needed based on the type of riding you do.

So in short the problem is, Due to the PERK factor and the love of Electric reverse we are going to be using the TEAM for some time.

The TEAM clutches helix diameter requires that you run much steeper angles then one might think - Example in a 900 Polaris

1st Track - 66-44-42-ER .46

2nd Track - 70-46-42-ER .46

These are the angles that need to be run, Flatland or Mountains it doesn't seem to matter. Most of the time 66-44 .46 will work in almsot all polaris sleds with the TEAM driven.

Black red spring is a good starting spring. TEAM has many springs you can play with.

This should get you closer then you may have ever been with your TEAM Clutch and help you understand what is going on with belt problems.


Backcountry
Senior Member




baD-MAX
Senior Member

Posts: 598
Joined: Oct 2002

Why is the driven trying to backshift for an instant when it should be upshifting? I'm totally confused! Which in my case is pretty easy to do.


baD-MAX
Senior Member

Posts: 598
Joined: Oct 2002


Why is this a TEAM clutch issue?


indydan
Senior Member

Posts: 4287
Joined: Dec 2001


You wingnut Max.

I guess I should have explained alittle deeper.

The Helix angles are to flat in most TEAM clutches, And the driven trying to backshift before it upshifts is a common thing, The shallower the angle & the bigger the motor the more violent the action, This is why it surfaced in the 900, The 900 and aplly far more force to the driven.


The reason its more of a TEAM issue is because the diameter of the helix is greater,and the helix angle has to be steeper then most would think, Thats why I say a team issue, If you used any other driven with to shallow of a helix the same thing would happen.

Max are you with me now???;)


JesseJames
Senior Member

Posts: 1074
Joined: Jan 2005


I have a question. What does the diameter of the helix have to do with the angle of the helix? What is the relationship between the two??

Marvs660
Senior Member

Posts: 1068
Joined: May 2004


Gonna be another good read.
Now which aftermarket secondary was it that claims for a quick backshifting once throttle was applied? So with that secondary wouldn't one be breaking belts also?
And I see what you mean about the larger diameter of the helix needing to be steeper as it brings the helix more towards the center of the secondary instead of closer to the shaft right?

Gotta love PERC though once you've been in situations where it can be used. But it is practically useless in deep powder.



indydan
Senior Member

Posts: 4287
Joined: Dec 2001


Quote
Originally posted by: JesseJames
I have a question. What does the diameter of the helix have to do with the angle of the helix? What is the relationship between the two??




Quote
What is the relationship between the two?

Mechanical Advantage.

Its really no different then opening the clutch cover of your sled and grabbing the O.D. of your driven, and turning it with one had and the sled moves across the floor. Now grab in closer on the helix hub and try to turn it, Then take the clutch off and try to move the sled by grabbing the jackshaft and turning it.

Now imagin you are the jackshaft and think about how the leverage factor changes has the roller or helix trac moves out from the center-line of the jackshaft.


indydan
Senior Member

Posts: 4287
Joined: Dec 2001


Fri March 10, 2006 12:11 PM

Quote
Originally posted by: Marvs660
And I see what you mean about the larger diameter of the helix needing to be steeper as it brings the helix more towards the center of the secondary instead of closer to the shaft right?



BINGO!!!!!!!!

Exactly Marv.

Sorry Marv I posted before I saw your post.

truckracer7
Member

Posts: 151
Joined: Nov 2005


thanks for the info and making it easier for the rest of us to understand :) it makes sense now the way you explained it


Marvs660
Senior Member

Posts: 1068
Joined: May 2004







geo
Senior Member

Posts: 276
Joined: Dec 2004


How come you never watched the clutches with a downhill after the flat at a constant throttle? That may have shown you the resistance to upshift that the heavy spring you are using may be the reason for belt breakage.
Clutching 101: Part load upshift is mostly controlled by spring pressure, full load upshift is mostly controlled by helix angle. If you use a spring that doesn't upshift at part load then it will effect full load too much and cause your clutches to run less than ideal. The backshift of the old twist the spring style clutch was initiated by the twist load pulling with the helix angle and the new encapsulated roller design is signaled by side pressure release (loaded spring) working AGAINST the helix angle on the backshift side. That is why most mountian setups use a heavy spring, to counter the fact that they have too shallow an angle on the helix and help the backshift.
The new style clutches are not there because of reverse, they are there because they work better. They upshift easier but not necessarily back shift easier. That is the balance the tuner has to find and because they react to load at the track better they need to be set up with less weight and in the front to make them open. This will allow you to use steeper helix angles (which backshift easier in this style secondary clutch) and softer springs. The light front setup backshifts easier too.
In the old discussion of heavy wieght- light wieght front set up, it was always said that you need wieght in the front to load the motor and open the back clutch. Well, now the back clutch opens easier and loads the motor through quicker gearing change. The higher side load pressure of the new style secondary keeps squeeze on the belt and increases as the sheaves open and get smaller in diameter. The old style secondary had little side pressure, compared to the new style, and used the helix angle more to provide belt squeeze (resistance to opening, not good). Adding wieght to the new style clutch only requires a stiffer spring and robs hp.
It seems to me, Dan, you need to finish watching the clutches at part throttle and start to let the back clutch open because I very much doubt that 2 degrees in a helix is the difference between a belt snapping or not. Heat and delamanation can do that. Geo.
 
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Learn to break in your belt

If your one that goes out and hammers the throttle or loads up the sled (IE; deep snow or hillclimbing) without breaking in your belt slowly, your a high candidate for a blown belt.

Break in your belt slow and easy for 30 miles and your belt will be fine. Washing your new belt in soap and warm water helps as well.

OT
 
dude have 4 belts blown in 250km no bs! no did not blow the first one on one ride but at the end of the second it came apart, same on ride 4, ride 6, see a pattern, and yes going back to dealer for round# 3, talk to us in 3 rides youll see. ask t/a said same as you just did now hes blowing belts to!

have you set the clutch up properly when mounting new belts, adjusting how it seats in the secondary clutch bells?
 
If your one that goes out and hammers the throttle or loads up the sled (IE; deep snow or hillclimbing) without breaking in your belt slowly, your a high candidate for a blown belt.

Break in your belt slow and easy for 30 miles and your belt will be fine. Washing your new belt in soap and warm water helps as well.

OT

Not that break-in isn't important, but that isn't the problem here. If that was the case, every other brand and model would be having the exact same problem.....

In my opinion, this problem has as much to do with clutch SETUP as anything else. I almost toasted belts on my first two mild 20-mile road rides. After a few changes, 200 miles of powder and climbing and I'm on the same belt.

On a related note, I had almost the same amount of clutch/belt heat cruising down the trail at mid-range rpms as I did breaking trail and climbing in 3 feet of heavy, heavy fresh.
 
Bring hot water and soap.

Selling now at your brp. dealer light weight soap and water container !:D
 
well our diller selling also beside light weight soap and water container he sells light weight brash , sponge and wipes for mountain cleaning all you need to do to carry this stuff one more backpack or extra guy on good rining sled
 
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