Blown Belt

[stevewithOCD]

This is worse than a belt..lolView attachment 146923

Looks like it has a lot of miles on it though...it blew out the front & even bent the steering rod

I thought the Cats were Gas-n-Go!

980 miles on 18SW RTX-SE. First belt at 415 miles. Second at 800. Third and fourth in the last 180. Had it dealer between two and three and all that seemed to do was add some goofy noise to the secondary. Offset was 62 from factory. Trying to get that closer to 58 per call with Ulmer. Not sure how to do that with only one washer to remove. Very disappointed in this issue. First belt on trail. Second on lake trail. Third and fourth in deep fluff yesterday. Biggest bummer is these are blowing without being pinned to the bar. I'm being cautious and still very poor results. All stock except upgrading to 1.6 cobra.

Side belly pan finally got tired of the punishment too and cracked up front.

I guess you didn't get lucky enough to get a Gas-n-Go sled either.
Maybe you ride TOO hard. LOL

 

[DMCTurbo]

I snapped a belt in half yesterday. There was fresh snow on the trail with a sugary base. I was playing with my clutching, Dalton black/teal primary, STM 60ys @75 grams, gen 1 black/orange at 60 degrees, 41/35 Dalton helix and Max spool 16. She was reving at 9100 and I heard it start slipping and kaboom before I could let off. I also went back to stock gearing. I experienced what Mike has been talking about lately.

I went back to the dtya1s today and a 70 degree wrap. 1000 mile trip coming up this week so I better put things back to what's worked for 5000 miles.

 

[thor452]

I finally Blew a belt...actually 2 back to back (400 miles apart). Probly have close to 8000 miles on the machine, every 1400-2000 miles I’d change the belt.

My clutch spring are probably getting tired. That mixed with hard driving in warm conditions didn’t make for good belt life.

But overall, I can’t complain for belt life on this machine. Right from day 1 it was great.

By contrast my Doo XS1200 at the start had a hard time going over 700 miles/belt. Even fully adjusted and floated. Had maybe a 1000mile belt life. Belts where 2x the price.

sounds like you were spot on with offset to begin with and when you did blow a belt the primary moved in a bit and now your offset is to high. when mine was off I would only get around 500 miles out of a belt. I removed the shim behind my secondary and I popped the primary back out with an old clutch bolt and a slide hammer. I am about 58 on my offset now and am at 650 on the belt I will get about 200 more this week and going up north this weekend and will get about 400 more. I hope this is fixed now and if I can get a few hundred more miles to be sure I would be a happy camper as I have only been getting about 500 a belt its whole life with me and I got it used so I don't know if it had blown a belt before or not.

 

[mcuhan]

That will give you almost 3mm
Actually 2.5mm

Removed clip and washer and offset appears spot on! Thank you for the tip. Will report back after the weekend.

 

[17winder]

17 stock ltx se. lot of belt dust, Blown belt (8jp) at 1400mi. 2 flat spotted rollers, paint rubbed off on primary spring and secondary spring. After reading umpteen pages on this issue.. what has been determined for the best fix? Will New rollers cause all 3 to make contact? New Dalton black/orange secondary spring? New helix? Shim the helix? Machined spring pocket? Not sure which way to go.. and would like to stay as close to stock setup as possible. Looking for whats been the best fix! Thanks

 

[J & J Racing]

I thought the Cats were Gas-n-Go!



I guess you didn't get lucky enough to get a Gas-n-Go sled either.
Maybe you ride TOO hard. LOL

they are if you change weights and secondary spring. If you are stock change secondary spring. It’s garbage just like the weight profile in them

 

[Fleecer]

17 stock ltx se. lot of belt dust, Blown belt (8jp) at 1400mi. 2 flat spotted rollers, paint rubbed off on primary spring and secondary spring. After reading umpteen pages on this issue.. what has been determined for the best fix? Will New rollers cause all 3 to make contact? New Dalton black/orange secondary spring? New helix? Shim the helix? Machined spring pocket? Not sure which way to go.. and would like to stay as close to stock setup as possible. Looking for whats been the best fix! Thanks

Put updated rollers in secondary with Dalton black/orange spring wrapped to 70-80 degrees. That spring with stock helix needs no additional machining/shimming. Whether or not all rollers touch wont matter with updated set.

Your primary spring will eventually break and should be updated. If you enjoy low engagement update to Yamaha blue/brown/blue. The Dalton black/bronze will provide stock spring performance and be more durable.

 

[17winder]

Put updated rollers in secondary with Dalton black/orange spring wrapped to 70-80 degrees. That spring with stock helix needs no additional machining/shimming. Whether or not all rollers touch wont matter with updated set.

Your primary spring will eventually break and should be updated. If you enjoy low engagement update to Yamaha blue/brown/blue. The Dalton black/bronze will provide stock spring performance and be more durable.

Yamahas updated rollers? Do glide washers need to be used on primary when I update the spring?

 

[Fleecer]

Yamahas updated rollers? Do glide washers need to be used on primary when I update the spring?

Yes, Yamaha updated rollers or cat torlon rollers will work too.

I say no to glide washers and have never used them, but opinions vary.

 

[WinterWolf]

Yamahas updated rollers? Do glide washers need to be used on primary when I update the spring?

Yup, my stock primary spring was broken when I changed it out this year as I tuned it. I didn't even know it was broken until I took it out and it fell into two pieces lol. The engagement was awfully low..so that was a sign that it was probably broken at the end of last season.

 

[17winder]

Yes, Yamaha updated rollers or cat torlon rollers will work too.

I say no to glide washers and have never used them, but opinions vary.

Do you happen to know the part number for yamahas updated ones? Part #s for 18s and 19s are same as 17

 

[thor452]

sounds like you were spot on with offset to begin with and when you did blow a belt the primary moved in a bit and now your offset is to high. when mine was off I would only get around 500 miles out of a belt. I removed the shim behind my secondary and I popped the primary back out with an old clutch bolt and a slide hammer. I am about 58 on my offset now and am at 650 on the belt I will get about 200 more this week and going up north this weekend and will get about 400 more. I hope this is fixed now and if I can get a few hundred more miles to be sure I would be a happy camper as I have only been getting about 500 a belt its whole life with me and I got it used so I don't know if it had blown a belt before or not.

So I am happy to report I now have over 1000 miles on my 8JP belt and it is no longer dirty. no belt dust at all!!! I did allot not sure what was end all be all for the fix but if I had to guess I would say offset was number one.

 

[theewarrior]

So I am happy to report I now have over 1000 miles on my 8JP belt and it is no longer dirty. no belt dust at all!!! I did allot not sure what was end all be all for the fix but if I had to guess I would say offset was number one.

So what is your set up, helix ,springs ,Weights?

 

[Fleecer]

Do you happen to know the part number for yamahas updated ones? Part #s for 18s and 19s are same as 17

You are correct part # for 17-19 are the same: 8kc-18178-01-00. Perhaps Yamaha changed the roller material and kept same part # ?? Maybe someone else can chime in and explain.

In 17 mine got flat before 500 miles. At the time there was no other choice but to go to the cat torlon rollers, which I did. Im now over 5k miles without issue.

 

[Fleecer]

So I am happy to report I now have over 1000 miles on my 8JP belt and it is no longer dirty. no belt dust at all!!! I did allot not sure what was end all be all for the fix but if I had to guess I would say offset was number one.

I agree, after utilizing Hurricane Bar and adjusting offset my clutches are exponentially cleaner. The belt dust that accrues now isn't even worth mentioning. I wish the 8JP had a little more strength, but other than that it is a good belt.