850 Clutching and Gearing

Teth-Air · Nov 7, 2018

Looking through my owners manual I think there might be errors.

There is no 2.6" track specs shown and this clearly show 3" specs.

The gearing shows 22:43 with a 69 pitch chain.

This is 1.95:1 gearing before considering the 7 tooth drivers or 2.12:1 with the 7 tooth.

This is what the Quickdrive runs so i expect it should read 20:50 like previous years??

Anyone check this for sure?

If it is correct we will be seeing a lot of gearing down being done.

Another interesting things is the change to 42 degree helix.

Chris

adamg · Nov 7, 2018

They have some 2019 sleds in parts breakout, but not the chaincase ones.
https://www.polarispartshouse.com/oemparts/c/polaris_snowmobile_2019/parts

Chrisco · Nov 7, 2018

Needs a 20/44 or 20/45 for 174 well why not a 46/20

kanedog · Nov 7, 2018

Chrisco said:
Needs a 20/44 or 20/45 for 174 well why not a 46/20

What have you found with these ratios?

JMCX · Nov 7, 2018

I have those gears for sale.

https://www.kijiji.ca/v-view-details.html?adId=1389189085

Chrisco · Nov 12, 2018

So the stock gearing on the 850 174 is 19/44 = 2.31, not to bad for stock.

ktmsx350f · Nov 12, 2018

Chrisco said:
So the stock gearing on the 850 174 is 19/44 = 2.31, not to bad for stock.

What’s stock on the 163 ?

kanedog · Nov 12, 2018

Is the 2.6" come with 8 tooth or 7 tooth drivers?
3" ?

adamg · Nov 12, 2018

Chrisco said:
So the stock gearing on the 850 174 is 19/44 = 2.31, not to bad for stock.

So we could probably put a 46 on the bottom with a new chain?

d8grandpa · Nov 13, 2018

Chrisco said:
So the stock gearing on the 850 174 is 19/44 = 2.31, not to bad for stock.

i haven’t seen mine yet, but do they have 7 tooth driver. If so that ratio would reduce. That seems to be good ratio to start with.

Chrisco · Nov 13, 2018

d8grandpa said:
i haven’t seen mine yet, but do they have 7 tooth driver. If so that ratio would reduce. That seems to be good ratio to start with.

Yes they have the 7 tooth, for stock gearing they got it pretty close out of the box this time.

c_basketball28 · Nov 15, 2018

has anyone had any problems with the clutches on the 850 a buddy had 3 hours on his and the vibration was really bad took it in and they sent clutch back to Polaris just wondering I haven't rode mine yet going next weekend but I hope its not an issue on a lot of them

d8grandpa · Nov 27, 2018

Chrisco said:
So the stock gearing on the 850 174 is 19/44 = 2.31, not to bad for stock.

Chris did you have your chaincase open to verify these gears? I have the new sled at home and the Manuel is saying 22/43.

Teth-Air · Nov 27, 2018

c_basketball28 said:
has anyone had any problems with the clutches on the 850 a buddy had 3 hours on his and the vibration was really bad took it in and they sent clutch back to Polaris just wondering I haven't rode mine yet going next weekend but I hope its not an issue on a lot of them

My clutch belt came too loose and there was a nasty vibration from slippage. Set deflection and all was good. Very little belt dust after riding 3 days. 2 850 x 174 side by side and the one converted to belt drive (same gearing) clearly had much more zip than the chain model.

Ohmz · Nov 27, 2018

With the belt deflection, is it same as the pros, and all the other polaris clutchs.... Adjust the height so the bottom of the groves is flush with the secondary?

kanedog · Nov 27, 2018

Ohmz said:
With the belt deflection, is it same as the pros, and all the other polaris clutchs.... Adjust the height so the bottom of the groves is flush with the secondary?

Setting deflection is the same procedure for all sleds.
Lift back of sled so track is off the ground. Adjust deflection so that the track is almost turning at idle. When idling on the stand, you should be able to turn the track easy with a two finger pull but it shouldn't do it on its own.
The bottom of the groove method is something Doo put out and it gets you close but it is not the correct way to set deflection. Now half the sled world does it like this. Doo ruined some potential future clutchers.

850 Clutching and Gearing

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