Yamaha clutches on 2012 800 pro cross

[09nytro]

Right ! there for there will be NO belt issues with the viper .....................!

 

[Banks93]

Right ! there for there will be NO belt issues with the viper .....................!

They are shorter and more expensive then the 8DN. I would say that is an issue.

 

[09nytro]

Welcome to the new age ... Prices can't stay the same forever besides I pay 89 for the ultimax belt ... I never use the stock Yamaha belt way to hard so again there will be no issues at all

 

[Off Trail Mike]

Sure are and IS being done.

What is inherently "special" about the current yam clutches. When compared to current cat ....

Knowing some drag racing "cat" guys, one big reason is the "V" angle of the clutches. Cat is 11.5 degrees and Yami is 14 degrees. Doesn't sound like much until you consider that belt slip needs to be "managed" way more as the angle gets tighter (closer to zero) and if you make the slightest mistake, the belt slips...

Results vary, but overheating belts, blown belts, poor performance, are some of the side effects...

Sound familiar?

OTM

 

[Rob_0t]

Sure are and IS being done.

What is inherently "special" about the current yam clutches. When compared to current cat ....

Knowing some drag racing "cat" guys, one big reason is the "V" angle of the clutches. Cat is 11.5 degrees and Yami is 14 degrees. Doesn't sound like much until you consider that belt slip needs to be "managed" way more as the angle gets tighter (closer to zero) and if you make the slightest mistake, the belt slips...

Results vary, but overheating belts, blown belts, poor performance, are some of the side effects...

Sound familiar?

OTM

Thanks mike... theres a direct answer with sound reasoning.

When you say cat is 11.5* are atating thats true through the whole line? Like my 98 tcat. Its sheaves are 11.5* ?

And yeah what you describe sounds familiar ...real familiar .........14* angle means more belt contact area... and maybe a bit easier to drive the belt UP the primary ..


Thanks for your answer bud.

 

[Off Trail Mike]

Rob:

Don't know if it is across the whole AC line, but his drag sled was an 2012 1100T, so probably the case.

I always been surprised at the difference. 11.5 to 14 doesn't sound like much, but it is almost 20%, and as an OEM, you gotta have your chitt together to make this work well, because you are giving up a lot of built-in belt "clamping force", which you have to add back in. Add the effect of cramped engine/clutch compartments on heat dissipation in the newer gear, and sleds routinely at 170-250HP on boost, and to me, its a recipe for disaster. Yami clutches handle boost and high HP much better (and no that's not saying boosted Yami's don't blow belts, just less of them)

The angle is one BIG difference. Anyone know what Poo and Doo are running for angles?

OTM

 

[AKrider]

from what I have been told was that Yamaha put a patent on the secondary floating clutch,that is why ski doo struggled in 08 and now cat since they can't float the secondary ,true or not I don't know but it kinda makes sense ,I have two Polaris on 12 and one is a 13 both have floating clutch and no belt issues either.so if true about patent how did Polaris get around it

I don't believe that. The OEM's have been floating secondary clutches since at least the 70's. My IQR has a floating secondary, I think my RMK does as well but I'd have to double check. My Ski-doo's had floating secondaries.

I watched my buddies 1100T blow a belt so hard that the sled came to such a sudden stop in deep snow while climbing up a glacier. It caused him to fly over the top of the bars and cratered out the snow in front of his sled. Mu understanding was the Cat clutches suck. I don't know? I've read so many different things about the issue.

 

[snowbeast]

Engine Reverse on 2 strokes.
That started the problems with belts. Cant use a torsion spring secondary with it.

Cats problem is not just the clutches. There is other issues or a combination of issues that cause belt blowing. HP is only one factor in the issue. Does it worry me being a Viper owner? Heck yea. If I dont get 2-3000 mi on a belt and a solution is not found quickly the Viper will be gone. But that wont happen right?

You guys with this viper wont have any issues compared to cats turbo,hell even cats 800 has half the issues,the number one thing with our belt life is heat,now lets start with a 2000 degree blast furnace,thats what you have with the underhood turbo,it glows cheery red when run hard,just the nature of it,than the TCL is a joke to,than there is the light weight j-shaft,weak gears,who ever would of thought someone would stack gears bottom and top of differant width,cat did,15 on top and 13 wide on bottom,why? And dont forget that prize auto chain tentioner,now thats classic,all of them problems only live in the cat turbo,so see you guys have nothing to worrie,that and you have a nice yammie torsion secondary,coupled with a very nice yammie primary.

 

[ROCKERDAN]

You guys with this viper wont have any issues compared to cats turbo,hell even cats 800 has half the issues,the number one thing with our belt life is heat,now lets start with a 2000 degree blast furnace,thats what you have with the underhood turbo,it glows cheery red when run hard,just the nature of it,than the TCL is a joke to,than there is the light weight j-shaft,weak gears,who ever would of thought someone would stack gears bottom and top of differant width,cat did,15 on top and 13 wide on bottom,why? And dont forget that prize auto chain tentioner,now thats classic,all of them problems only live in the cat turbo,so see you guys have nothing to worrie,that and you have a nice yammie torsion secondary,coupled with a very nice yammie primary.

 

[yamadoo]

Thanks guys WOW I never dreamt off the # and detail of the answers.
I can see a lot of thought and work has gone into this

Thanks yamadoo

 

[stingray719]

Sure are and IS being done.

What is inherently "special" about the current yam clutches. When compared to current cat ....

Knowing some drag racing "cat" guys, one big reason is the "V" angle of the clutches. Cat is 11.5 degrees and Yami is 14 degrees. Doesn't sound like much until you consider that belt slip needs to be "managed" way more as the angle gets tighter (closer to zero) and if you make the slightest mistake, the belt slips...

Results vary, but overheating belts, blown belts, poor performance, are some of the side effects...

Sound familiar?

OTM

Agreed, my 2014 Cat secondary has changed angle sheaves and bigger cooling fins (sound like somebody talked to Yamaha?)