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flat spot on driven roller

All you guys running the cat rollers how are you making out? Thinking of ordering some but want to hear how they are holding up as in Ontario they are like $95 for 3 rollers. The dealer said Yamaha won't have updated rollers out until late January.
 

125 miles this weekend on cat rollers and they look and worked good. The sled would pull 8750 to 8900 all the time and backshift was spot on. So far so good.


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1 mile in the back field, pulled the secondary, notice the pic that doesn't have full roller mark, the roller is free floating and can spin by finger easily at rest! The other two rest on ramp can not spin and shows full roller mark. If I get time going to pull it apart and digitize helix angles,centers and rollers to find out what's the issue.View attachment 124720View attachment 124721


couple q's...

what changes if the twist is changed?

wonder if the helix is spaced out with a washer underneath?

or the mount on the one roller touching...if that "pad" that contacts the clutch was slightly machined and therefore allowed the other two to contact?
 
Have about 500 kms on them, look good so far, 8750 to 8900 rpms. Have not done any long high speed pulls yet, up to 170 kph on field trails.
 
or the mount on the one roller touching...if that "pad" that contacts the clutch was slightly machined and therefore allowed the other two to contact?[/QUOTE]

I was thinking that way too, but I'm also wondering if the number of rollers in contact would change part way up the helix. Someone had posted earlier their helix angles were different on the same part.
 
I just called the dealer for the hell of it to see if they heard of the roller issue or had any word from yamaha. He said he hasn't heard of the issue. If we really want any factory support, I encourage everyone of you who have had such issues, report it to dealers and the manufacturer. Squeaky wheel gets the grease. On another note he said he still has heard nothing from yamaha about the turbo bolts. Cat,on the other hand, has contacted them and put out a bulletin.
 
Just curious if anyone has measured the diameter of the rollers (both outer diameter and bore diameter) and if they are the same on all 3 rollers?? If they are slightly different diameters I guess you could put the smallest diameter roller on the ramp taking the most pressure and large roller on ramp where roller spins freely. Not a proper fix but may help disperse the load more evenly until Yamaha sorts it out?? I haven't taken mine apart to check this yet. I still think new rollers and helix is best solution...
 
I just called the dealer for the hell of it to see if they heard of the roller issue or had any word from yamaha. He said he hasn't heard of the issue. If we really want any factory support, I encourage everyone of you who have had such issues, report it to dealers and the manufacturer. Squeaky wheel gets the grease. On another note he said he still has heard nothing from yamaha about the turbo bolts. Cat,on the other hand, has contacted them and put out a bulletin.
I was at dealer today for service and issues.... blew belt at 287 miles, oil change in motor and chain case, suspension adjustment for weight transfer, Yamaha will be releasing tomorrow a service bulletin for turbo bolts ( I gave my dealer Cat's service instructions to do work - completed! ), exhaust shield crack to repaired later ( parts ordered ). As for flat spots.... two rollers fkd.... parts back ordered... drove to Cat and got 0648-824 rollers as in an earlier thread, fit nice and hope they work.
Mine was first sled in for service this year so my dealer has 19 more coming.... way to go Yamaha.
 
I have never seen so many people complain about a sled in my life! Loose. Bolts big deal tighten down. Flat spots on rollers replace them what 20 dollars big deal. Heat sheild cracked so order a new one under warranty and it take 5 minutes to change yourself! Now go by a 70 thousand dollars truck and I have had it back in for warranty 3 times in 2016 and you tell me you got problems?
 
I have never seen so many people complain about a sled in my life! Loose. Bolts big deal tighten down. Flat spots on rollers replace them what 20 dollars big deal. Heat sheild cracked so order a new one under warranty and it take 5 minutes to change yourself! Now go by a 70 thousand dollars truck and I have had it back in for warranty 3 times in 2016 and you tell me you got problems?
Ford?
 
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regarding the rollers we have heard of numerous reports of some flat spots. most dont see it hurting anything right away, i expect they will upgrade them...have seen it before on other brands of sleds and atv models ( skidoo 1200, some early cats, etc. It probably wont hurt much to go ride it right now, just keep an eye.

With respect to the helix and 3 rollers hitting, ..as someone had mentioned, and showed pics, it is a poor casting and has a few little flaws. You will see in the picture that the roller contact is funny.

I have done this with a stock helix, ..if you take a BRAND new set of factory rollers with no wear, ..and put some prussian marking blue smeared lightly on the roller, ..and rotate the clutch through its travel with no spring ( but the clutch and helix all bolted up together...just no spring)...and let the roller mark the helix , you notice a few things. The thing that stands out is that the outside of the plastic roller hits at first, ...and as the rollers come down, the roller is only touching on the inside of that stock helix ramp....thats how it is on the 2 clutches we originally had here. the pitch angle on the stock casting is off a little and has a bit of twist to it..

Will it hurt?..maybe, maybe not right away. Time will tell. the casting is not perfect in dimensions as mentioned. ..and it compounds because it is a cast part bolted to a cast clutch that is rapidly manufactured. I'm sure lots will run them a long time and it will work...I guess time will tell. To me a crap casting but it functions.

as for the 3 rollers hitting:
....note...have seen it plenty. Again, on yamaha and other brands with 3 contacts. ...and still do.
Even the older yamaha button clutches were like this ?...yes they were, easy to prove.
I have seen it for a long time. With the buttons it would look after itself in a few miles and wear the other two a bit.,

...on Cat roller clutches people have seen it for years , ...one roller spinning. It usually looks after itself once you get out and drive it.
A machined helix is WAY more accurate than a cast one and gets rid of a lot of that ( and takes it to a slim margin) but you still sometimes see it a bit at first when you put one together. Sometimes loosen the bolts slightly that hold the helix on and let the spring smack the moveable sheave back a couple time and re-tighten it helps, etc.
You do also have to remember that those three posts that are sticking up there ( that the helix bolts to) are hot cast posts that are machined in a hurry, and even if one of them is like a slight fraction taller it makes that roller free.

Hopefully Yamaha send new rollers, we have seen other manufacturers that have. I wouldn't panic too much, hope it helps
 
regarding the rollers we have heard of numerous reports of some flat spots. most dont see it hurting anything right away, i expect they will upgrade them...have seen it before on other brands of sleds and atv models ( skidoo 1200, some early cats, etc. It probably wont hurt much to go ride it right now, just keep an eye.

With respect to the helix and 3 rollers hitting, ..as someone had mentioned, and showed pics, it is a poor casting and has a few little flaws. You will see in the picture that the roller contact is funny.

I have done this with a stock helix, ..if you take a BRAND new set of factory rollers with no wear, ..and put some prussian marking blue smeared lightly on the roller, ..and rotate the clutch through its travel with no spring ( but the clutch and helix all bolted up together...just no spring)...and let the roller mark the helix , you notice a few things. The thing that stands out is that the outside of the plastic roller hits at first, ...and as the rollers come down, the roller is only touching on the inside of that stock helix ramp....thats how it is on the 2 clutches we originally had here. the pitch angle on the stock casting is off a little and has a bit of twist to it..

Will it hurt?..maybe, maybe not right away. Time will tell. the casting is not perfect in dimensions as mentioned. ..and it compounds because it is a cast part bolted to a cast clutch that is rapidly manufactured. I'm sure lots will run them a long time and it will work...I guess time will tell. To me a crap casting but it functions.

as for the 3 rollers hitting:
....note...have seen it plenty. Again, on yamaha and other brands with 3 contacts. ...and still do.
Even the older yamaha button clutches were like this ?...yes they were, easy to prove.
I have seen it for a long time. With the buttons it would look after itself in a few miles and wear the other two a bit.,

...on Cat roller clutches people have seen it for years , ...one roller spinning. It usually looks after itself once you get out and drive it.
A machined helix is WAY more accurate than a cast one and gets rid of a lot of that ( and takes it to a slim margin) but you still sometimes see it a bit at first when you put one together. Sometimes loosen the bolts slightly that hold the helix on and let the spring smack the moveable sheave back a couple time and re-tighten it helps, etc.
You do also have to remember that those three posts that are sticking up there ( that the helix bolts to) are hot cast posts that are machined in a hurry, and even if one of them is like a slight fraction taller it makes that roller free.

Hopefully Yamaha send new rollers, we have seen other manufacturers that have. I wouldn't panic too much, hope it helps
Would flatted rollers cause more heat thus friction and cause belt to over heat and blow?
 


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