blew 2 belts in 2 days. Help!

[Yamaha Vector LTX GT 2009]

Do you have a pic of the blown belts? How are they failing? Is top coming off? chunks breaking off the sides? Breaking in half?

I've only ever blown 2 belts on my LTX in 4000 miles. Pretty much back to back, within 200 miles of each other. The first belt was the original and it had over 5000 miles on it and the top started peeling off.

The second one broke into multiple pieces, all no bigger than about an inch, and I had to cut apart (using the teeth of some s#!tty needle nose pliers) what felt like 300 feet of Kevlar chord which was wrapped all around the hub of the secondary jamming it stuck open. I don't have a pic of that one.

I suspect the second one blew because I did not clean my clutches good enough after the first one blew. I kept seeing 9000 rpm before she went.

Since then, its been about 2000 miles but I now religiously dry air blast clean them every 500 miles. I know its getting dirty when the RPM's start climbing high. Its crazy how much dust comes out of there.

View attachment 138621

two of the belts part of the top was coming off and the other one the top came off and it made a mess but it did not get wrapped around the secondary clutch.

 

[Yamaha Vector LTX GT 2009]

There is a good chance you have warped clutch sheaves. I have heard this being the problem for blowing many belts before.

Is there a way to check to see if it is warped? Like should I put the snowmobile on a jack and hit the throttle some to see if it is warped? Do the primary's get warped or is it just the secondary?

 

[Apexpat]

Is there a way to check to see if it is warped? Like should I put the snowmobile on a jack and hit the throttle some to see if it is warped? Do the primary's get warped or is it just the secondary?

Did you ever find a solution to your problem? I have a 12 Vector that has suddenly started eating belts, 3 in the last 1000 miles. The first 2 were older belts so I thought ok let’s put on a new one, blew a new 8DN belt in 400 miles. I usually get 4-5000 miles on all the apex and vectors I’ve owned. Looks the the belts are heating up and the top edge of the belts are delaminating. I did notice the top edge of the belt was sitting below the top edge of the secondary so I put the 3 washers into the back of the secondary to see if raising the height will help. It does squeal slightly at idle with the new belt. The sled has 12,000 miles and I noticed like others have said the primary is definitely grooved and wondering if that is the main issue? But I’m guessing it’s been that way for awhile. Can’t be blowing belts frequently at the price and don’t want to get stranded on a longer trip.

 

[Stubbs]

Have you laid a straight edge along the clutch sheaves running surface to see if they are cupped? That tends to delaminate the top cogs off and the 8DN is hard enough to wear out clutch faces.