I am waiting for empirical knowledge. Everything stated is plausible, yet to be proven. BRP has an enormous amount of liability riding on there decisions , from financial , legal, and public perception, plus they have an R&D budget most do not have in their garage. Does anyone recall the clutch wobble debacle which had Red Green in his garage completely redesign the thing. I watch a video interview of Eric Woog talking about how vendors will sell products with no evidence of consumer benefits. I am Not applying that to this scenario but. If you plan on using your sled in ways outside of recommended operating procedures (which if you weren't, why would you buy one ,lol) looking for flaws and finding a fix is great, but as a consumer "buyer beware". Enjoy the ride everyone and stay safe!
Chain case life Gen 5
- Thread starter snow-doo
- Start date
Very true... Polaris tried it many years ago as well. I know someone who has almost a dozen of those shafts, stripped, laying in the scrap pile....
We almost had to heli a sled off the mountain last year because of the TKI 2 piece bottom gear design on his belt drive on a gen4 turbo. Same basic issue with spline walk on the mating part. The outer portion ate inner part and the gear wobble under load would walk the belt off into the inner face of the case and eat the belt in about 5 miles. We ended up carting a the parts full a chaincase and switched it back to chain on the mountain.
Not having to do chaincase fix on the mountain again would be nice.
Not having to do chaincase fix on the mountain again would be nice.
Last edited:
I have fixed on the hill also way more cost effective than a helicopter 
It used to be if you had no chain case, you had no brakes. So you found a parts somewhere.
Last edited:
can't argue with that reasoning.Gonna err on the side of caution and put the sleeve retainer in
Yes, many.
Ran a '19 shaft, '19 53 tooth standard gear, standard top gear, and standard chain for over 1200 miles last season on a 165 Freeride 850 Turbo R. No issues, added one turn to tighten in 1200 miles. The standard chain can take the use. It's more a problem with the sintered bottom gear in the '23's. Gear wobbles, stretches chain more, chain binds on gear eventually, center of gear blows apart, more failures downstream. The new milled gear, with no holes, and better chain will help the gear not blow apart but it doesn't fix the wobble. It will prolong the time in which a problem will occur but it will still eventually stretch the Hyvo chain too and bind. The chain might be the only thing to break at that point, not the gear, but the case will still suffer as well... How many '21-'22's has anyone had a problem with the chain/gear failing? Not many I'm aware of.... the only difference is the 2 piece shaft, literally.....
You forgot few things. Differences from 20-22 turbos to 2023 turbo:
- More power
- More torque
- A lot Weaker chain and sprockets
- 2-piece drive shaft
And it is cool to do bow ties and re-entries now, along with wheelies and such. This stuff requires lots of throttle and often hard landings.
Last edited:
Not considering all the guys that tuned up their '21-'22's.... Sprocket is the same design and material, just a different cut for the chain. Anything can break but the point was, if it's kept in a straight line it will last longer. A sintered metal gear will work fine ('21-'22) with out a wobble. As soon as you start flexing that thing side to side, and have a bunch of holes in the middle, sintered doesn't take the side forces as well and bang...
they did essentially admit to a problem by replacing the drive components, the question now is how much of an issue is the wobble. is it a ticking time bomb as the miles accumulate or is it not ideal but good enough for their failure rate statistic threshold?
This is not correct. Rexnord and Borg Warner are two different manufacturers.
Once more, sprocket & chain table Gen4 & Gen5:
2017-2024 naturally aspirated 850: Rexnord std silent chain
2020-2022 850Turbo: Borg Warner Hyvo
2023 850Turbo R made in USA/CAN: Rexnord std silent chain
2023 850Turbo R made in Europe: Rexnord Aurora
2024 (and 2023 update) 850Turbo R USA/CAN/Europe: Borg Warner Hyvo, also added reinforced bottom gear with no openings
- Personally I have not seen one BW Hyvo chain or sprocket to fail on 2020-2022 turbos. I have seen a chain that was so overtighten that slider was gone. But still no problems with the chain.
- I have seen many failed Rexnord std chains and sprockets fail on naturally aspirated between 2017-2022 with solid shaft. It does holp up good on n.a. but I can say its not even nearly strong enough for Turbo R.
Last edited:
C
caper11
Well-known member
You totally missed what he said. The process in making the rexnord and borg warner pitched sprocket is the same, the CUT of the tooth is made to fit the chain, and its pitch.
The chain is always the weak link in a chain drive system.
BRPs P/n are stamped on all of the sprockets, and the chain Manufacturer has their markings on the chain plates.
Sent from my iPhone using Tapatalk
The post claimed that BW and Rexnord are same material, which is not true. Design also is different and you cant mix BW, Rexnord std and Rexnord Aurora parts. Any of them dont fit together with each other.
C
caper11
Well-known member
Forget about the BW and Rexnord. I know what he ment.
The process that the sprockets are made out of, are the same. Same material, the same holes etc. Regardless of the pitch of the tooth that cut on the OD of the sprocket. That’s what he ment, they are built the same, and the same design that been used for years.
Now doo went back to the machined solid steel bottom sprocket, same design but not tooth cut that came on the T3 and early G4’s.
Sent from my iPhone using Tapatalk
