Blowing drive belts

rogerz1000

rogerz1000

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Anyone know what would cause 3 belts to blow in one weekend on my 2006 Apex? I haven't changed anything on the clutch over the summer and have no missing washers, or loose bushings. I started off with the same belt as last year that I had and rode hard with several times over 100mph. Every time I hit 100 over the weekend a belt blew up shortly after.

I changed the chain case oil and it is a bit over full, (my bad) and I have tightened the chain a but but it still has a 1/4 turn play before I locked it down.

Does this issue point to needing a new primary clutch spring, or both springs maybe?
 
Check clutch alignment and whet is your driven wound at? How many mile's on sled. If all is good try a new driven spring. Make a couple hard run's and check your clutches to see if they are cool. Also are you giving the new belt's some break in time before WOT?
 
Look at your bulkhead, and jackshaft bearing. My friends 04 warrior had a cracked bulkhead near the front motor mount and a badly worn jackshaft bearing. Fixed both and no more problems, knew something was seriously wrong when it blew three belts in one ride, not much left of any of them.
 
X3 on the clutch alignment.

Even if the clutches look to be aligned with the engine off, broken motor mounts, bad jackshaft bearings, or a cracked bulkhead could all cause the clutches to be out of alignment under power.
 
I guess it's time to check alignment again, and a list of all these other things. The sled has 7,800 miles and has had the bearing changed already, but I will check again.
The driven clutch is set to stock settings, and the belts were broken in before I was hard on them.

Is there an access port for the shaft bearing on the left?? Dealer said it takes about 1/2 hr to change.
 
rogerz1000 said:
I guess it's time to check alignment again, and a list of all these other things. The sled has 7,800 miles and has had the bearing changed already, but I will check again.
The driven clutch is set to stock settings, and the belts were broken in before I was hard on them.

Is there an access port for the shaft bearing on the left?? Dealer said it takes about 1/2 hr to change.
Click to expand...

Are you asking about the jackshaft bearing behind the secondary clutch?
 
Yeah, I guess there is a port there after you remove the driven clutch..? Is it where the speedo comes out?
 
rogerz1000 said:
Yeah, I guess there is a port there after you remove the driven clutch..? Is it where the speedo comes out?
Click to expand...

No the speedo pick up is on the drive shaft for the track. That bearing would have no effect on clutch alighnment. I was referring to the jackshaft bearing that is directly behind the driven clutch.

However for this bearing to cause clutch alignment issues it would have to be really shot. You would be able to feel the slop in it if you grabbed the driven clutch and tried to move it up and down or back and forth.
 
Well, There is a little... Just under a 16th it feels like. Should there be any play at all?
 
rogerz1000 said:
Well, There is a little... Just under a 16th it feels like. Should there be any play at all?
Click to expand...

There should be some play when you grab the driven clutch and slide it in and out on the jackshaft (towards and away from the bearing) however this is not what I am talking about.

There should be zero play up and down or forward or back as the jackshaft should stay perfectly centered and tight in the taper lock bearing. If you have any doubt as to if the play is in the clutch to shaft connection or the bearing, simply remove the driven clutch and try to move the jackshaft up and down or forward or back.
 
I doubt that the jackshaft bearing behind the driven clutch is causing a clutch alignment issue unless it is completely shot which will be very obvious when you grab the jackshaft and try to move it up and down and forward & back.

If you do have a bad jackshaft bearing behind the driven clutch it is a bit of a challenge to change. I just replaced all of my drive shaft & jackshaft bearings and this one was the most difficult to replace by far.

If you need to replace this bearing here are a couple of helpful links.

http://www.ty4stroke.com/viewtopic.php? ... eplacement

http://www.totallyamaha.com/snowmobiles ... change.htm
 
I should have been more specific, not sure if his jackshaft bearing was the culprit, but was shot just the same. Fixed booth, my money would have been on the cracked bulkhead blowing the belts. Did your sled make any funny noises or vibrations before the belts failed? His would have a low frequency vibration that would continue to get worse until it failed.
 
Well, I think I'm in good shape. No bulkhead cracks, loose motor mounts, Jack bearing seems tight. My clutch alignment is off!!! Never had an issue with it last year, and it didn't look like the guy that owned it before me blew up any belts. I will align the clutches and I have 2 new springs to put in as well. That should do it.
Thanks for everyone's input! It was good to check all the other things as well. ;)!
 
Let us know how things end up.
 
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