Blown Belt

[DMCTurbo]

Glad to hear that we are hearing more and more about great luck with the SW after secondary mods.

I stumbled onto the secondary spring binding on my Viper in 2014, when 3 members on a TY ride came to me with broken secondary springs. That day will always be vivid in my memory because it changed the Vipers top speed, belt dust and made me really think about the Yamaha secondary how it works. When my SW belt blew at 8 miles, I started checking things out..."Yup, same crap" then a couple members here got a hold of me and to ensure that these issues are the culprit of breaking belts, loss of top speed and belt dust...I machined a few clutches for a few members here now with great results.
Did these as a favor and didn't charge for these to be machined....just so people know I am not in business to make money off of this, I just want to help people get their Yamaha's running the way they should.

You should start a thread explaining exactly what you did...

 

[NOS-PRO]

Hat's off to NOS-PRO for taking his time/knowledge and sharing with others without holding back so we can all have fun. Guys like him are priceless to this site.

Thank you SEVS11

Without a lot of these great guys here....my test buddy Shagman and boostednytro, along with all the other awesome members and Vendors here... I would just be another face in the crowd.

So, thank you everyone!

 

[Turbo 998]

Hat's off to NOS-PRO for taking his time/knowledge and sharing with others without holding back so we can all have fun. Guys like him are priceless to this site.

I agree With SEVS11. Many great minds on here!!!

 

[1100saber]

for those having the pocket in the secondary machined to reduce spring bind...anyone willing to disclose how much material to be removed? I have access to local machine shop with all the necessary equipment, but owner is not a sled head..and will simply take off how ever much I tell him to. And frankly I have no idea haha. Feel free PM me if preferred

 

[Turbo Dynamics]

Yes it involves Machining secondary spring pocket a certain amount to prevent coil binding as well as shaving primary sheeve face to get full overdrive. Woody's yamaha for more details...

We have not tried that recipe yet but im sure it will help as that was exactly what i planned to do. Woody has all of the spec figured out.

 

[Fleecer]

That's great to hear, And this is what makes things very confusing.. Guy like yourself without bind the next two guys have it!! inconsistent from one sled to another

Did some testing today with 8dn belt. Went to cat dealer to pick up rollers and he only ordered 2 so couldn't try them.

At any rate, my buddy has 2014 cat 1100 turbo JDP 220 tune, torsion conversion rear clutch, pipe, etc.....great running sled. My Winder Eco/trail/superquiet, raced several times, and I beat up on him bad...not a race. I could give him headstart and motor right by. Conditions were horrible, soft, loose, mealy rr bed, but about 8 degree temps. He was doing 104, winder 115. The last time we tried it, I held the winder 2 miles and so did he. At the end of the stretch, I could feel sled start to vibrate....the belt had had enough. I stopped, removed clutch cover and clutches were smokin hot. I could put my hand on them 5 seconds, then had to remove. Checked cat clutches and only warm, maybe 120 degrees. I never thought I'd see the day where cat clutches run colder than yamaha.

I had no burn marks, yet smoking hot. I did note rear clutch even hotter than drive. Thought I'd share my findings.

 

[shagman]

Did some testing today with 8dn belt. Went to cat dealer to pick up rollers and he only ordered 2 so couldn't try them.

At any rate, my buddy has 2014 cat 1100 turbo JDP 220 tune, torsion conversion rear clutch, pipe, etc.....great running sled. My Winder Eco/trail/superquiet, raced several times, and I beat up on him bad...not a race. I could give him headstart and motor right by. Conditions were horrible, soft, loose, mealy rr bed, but about 8 degree temps. He was doing 104, winder 115. The last time we tried it, I held the winder 2 miles and so did he. At the end of the stretch, I could feel sled start to vibrate....the belt had had enough. I stopped, removed clutch cover and clutches were smokin hot. I could put my hand on them 5 seconds, then had to remove. Checked cat clutches and only warm, maybe 120 degrees. I never thought I'd see the day where cat clutches run colder than yamaha.

I had no burn marks, yet smoking hot. I did note rear clutch even hotter than drive. Thought I'd share my findings.

If you have black mark on your secondary after that run and the heat it will be down in the secondary. You won't be able to see it without taking it apart. That sounds like top end coil bind to me.


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[SEVS11]

for those having the pocket in the secondary machined to reduce spring bind...anyone willing to disclose how much material to be removed? I have access to local machine shop with all the necessary equipment, but owner is not a sled head..and will simply take off how ever much I tell him to. And frankly I have no idea haha. Feel free PM me if preferred

The amount that needs to be removed is 0.70" in the spring pocket base only. If some local Sudbury area guys need it done my buddy has a machine shop and is willing to do them for $50 bucks. I have no feedback yet with fix and 8DN belt too cold to ride lol pm me if you need one dome

 

[stevewithOCD]

Would i be better off going back to 60 degrees on stock clutching until this gets figured out?

 

[shagman]

Would i be better off going back to 60 degrees on stock clutching until this gets figured out?

My opinion is yes. Coil bind gets worse with more wrap.


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[SideHogger]

Yah it's weird. Was gonna wind it tighter but will stay where I am at for now.

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I tightened mine this past weekend and experienced binding. Going back to stock setting and I have washer on jack shaft behind secondary.

 

[uprider800]

I tightened mine this past weekend and experienced binding. Going back to stock setting and I have washer on jack shaft behind secondary.

I tightened mine to 70 and it seemed like the sled hit the wall around 100 mph on the grade. Snow was a little loose but something didn't seem right on top end. How could you tell it was binding?


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[kylechargerrt]

I tightened mine to 70 and it seemed like the sled hit the wall around 100 mph on the grade. Snow was a little loose but something didn't seem right on top end. How could you tell it was binding?


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That sounds like binding to me

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[SideHogger]

Same with mine. Even my buddy who took it for a spin up top said it feels like it wants to go faster but it falls flat on its face.

 

[shagman]

I tightened mine to 70 and it seemed like the sled hit the wall around 100 mph on the grade. Snow was a little loose but something didn't seem right on top end. How could you tell it was binding?


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It was binding. That was the wall you hit. If you would of held it longer you most likely would have blown a belt or at least put a lot of belt on your secondary as it got hot.


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