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Anybody tried this?

Its been around for about 10 yrs now. Those are actually bearings and thrust washers used in a transmission, and are designed to work with a constant flow of oil on them.

Not ideal for a dry/dirty snowmobile clutch. Most guys give them a light coating of oil, but that doesnt last very long.

If you want to try it... you can buy them for 1/2 price on amazon.

https://www.amazon.com/Koyo-NTA-4052-Assembly-Rotational-34200lbf/dp/B006KT31GK

https://www.amazon.com/Koyo-TRA-4052-Thrust-Roller-Bearing/dp/B006KT355W
 
I have used this set up on my Cat and Polaris current. I think it helps, noticed it more on my 2011 Cat things seemed much smoother. I have had my secondary apart since install and see no wear on the bearing from not having oil on it at all times. They are easy to install and can't hurt.
 
The surface on the clutch is not flat so a bearing surface, shim, will need to be applied, then the bearing, then another shim before the spring cup. These three pieces are considerably thicker than the typical stack of delrin washers (1-3). They will likely start to affect the spring rate slightly. I ran this in my Polaris last year and noticed a lot faster backshift but otherwise no real gains. I also used a dry moly lube for the bearing.
 
I run one. Works great. Bought mine thru Carl's. No lubricant needed because, unlike a tranny, or whatever these were originally made for, the bearing barely moves. I highly recommend it, but you may need to compensate for the added thickness.
 
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