new drive shaft axle?

[actionjack]

Maybe yamaha/cat did a change this season??? We won't know until the 2021 part # list comes out

IF they made a change maybe @JMS@Yamaha could let us know.

 

[twyztid]

It seems like a bearing with a cocentric locking collar could solve these issues while still allowing for easy disassembly.... although due to the brake caliper location, the locking collar side of the bearing made need to be on the inside of the tunnel, not against the brake rotor.

https://www.timken.com/products/timken-engineered-bearings/housed-units/concentric-locking-collar/

 

[Richard Hodgins]

I had the BOP wedge for 5000kms and pulled it out to see ZERO wear on my driveshaft. This worked for me! Bearing was still good too. Now have 11,000kms on machine and driveshaft still looks great!

 

[cannondale27]

I had the BOP wedge for 5000kms and pulled it out to see ZERO wear on my driveshaft. This worked for me! Bearing was still good too. Now have 11,000kms on machine and driveshaft still looks great!

Good to hear!

 

[rtx moose]

ok so i just looked at the official iso guide to bearing fits and the shaft should not be less than .0005 of the bearing diameter!!!so if the shaft is .001 under theres going to be trouble.

 

[SAB1]

I had the BOP wedge for 5000kms and pulled it out to see ZERO wear on my driveshaft. This worked for me! Bearing was still good too. Now have 11,000kms on machine and driveshaft still looks great!

Thats what we want to hear! How many foot lbs did you torque it?

 

[Crossfire12]

I had the BOP wedge for 5000kms and pulled it out to see ZERO wear on my driveshaft. This worked for me! Bearing was still good too. Now have 11,000kms on machine and driveshaft still looks great!

Before you put this on was the bearing spinning?

 

[cannondale27]

ok so i just looked at the official iso guide to bearing fits and the shaft should not be less than .0005 of the bearing diameter!!!so if the shaft is .001 under theres going to be trouble.

Thats what I meant before. Many including the brand new 2020 shaft I got are not even close!

 

[VX1R]

It seems like a bearing with a cocentric locking collar could solve these issues while still allowing for easy disassembly.... although due to the brake caliper location, the locking collar side of the bearing made need to be on the inside of the tunnel, not against the brake rotor.

I think "twyztid" is on to something here. For decades Yamaha has used a concentric bearing with a locking collar on the driveshaft bearing and the jackshaft bearing. Has anyone ever heard of the bearing spinning on either shaft with this set up?

With the concentric bearing you've got a lot more surface area to make contact with the shaft along with locking it down to the shaft.

I'm sure that the Arctic bean counters have a lot to say in what components they use. It's too bad Yamaha doesn't step up to the plate with this seemingly tried and true set up.

Here's a diagram of the 2020 Yamaha RS Venture and VK 540 that are the sole surviving sleds still being made by Yamaha in Japan. It's interesting that Yamaha still uses the concentric bearing and locking collar on it's sleds:

Draw your own conclusions here but I think the answer is pretty obvious.

Thoughts?

 

[RAMSOMAIR]

Now how hard would this be for AC to have their bearing supplier manufacture, peanuts!

 

[cannondale27]

We also need to ask ourselves if some slip was by design. I think it was and thats why it hasnt been changed yet. Chassis Flex.

 

[RAMSOMAIR]

Could very well be the flex is required. Maybe the sled vibrates like a mofo is locked solid??

 

[cannondale27]

Could very well be the flex is required. Maybe the sled vibrates like a mofo is locked solid??

Flex in a chassis can be a very good thing for handling.

 

[VX1R]

We also need to ask ourselves if some slip was by design. I think it was and thats why it hasnt been changed yet. Chassis Flex.

I'm not meaning to bust your ballz here Steve but let's agree to disagree....

https://dsportmag.com/the-tech/chassis-101-performance-control-safety/

I'm sure that AC and Yamaha have engineers on their staff that are on a much higher pay grade than me but it's an interesting topic to consider.

I've got some flex in my current chassis (body) but so far no slippage on my drive shaft

 

[WinderFab]

IF they made a change maybe @JMS@Yamaha could let us know.

JMS responded to some posts under the 2021 release and stated that they are working on a fix.