800 VS 850 Motor - The Truth!

MDEVO · Mar 15, 2019

Looking for honest reviews of the 850 motor.

I’ve had limited time on an 850, at 2000-3000 ft with re-map and was very disappointed. The 850 seemed to have low end grunt and then fell on its face.

My friends, and a lot of others seem brain washed that these motors work better, so I’m wondering if it’s just me?

I feel that my 17 800 with 1400 miles felt much quicker, and had more legs up top. I have an SLP pipe / pink green spring and 10-72’s and the thing works great. Crisp throttle response and a violent powerband, never a hiccup.

I honestly think the 800 motor works much better.

However, there are only three 850’s in my crew, so wondering if they just all got unlucky... they all have running issues (fouling plugs/ bogging) and 1 has been rebuilt.

Any honest review appreciated....

AdrenalineAddict · Mar 15, 2019

I've rode with 4 different 850's so far this season, and have run them side by side in all conditions, three of them have nothing on my stock 2018 800 (actually not quite as quick 0-60) one of them runs ski to ski with a stage 4 800 and is very impressive. The one that runs well runs a 60/40 and 10-66 Polaris weights at elevation with stock springs, it has an incredible launch and big top end pull. It runs like it should, I'm thinking Polaris just missed the mark a bit with factory clutching on this one.

Dazzler · Mar 15, 2019

I have a 2018 turboed Axy 800, 2019 Axy 800 completely box stock, and a 2019 850 Axy completely box stock, no reflash and has never missed a beat, bogged nor fouled a plug. All three sleds have 163x2.6 track and belt drive. The 2019 850 has roughly 500 miles on it, 800 has just over 400 miles and there is no comparison between the two sleds. I'm wondering if maybe something is wrong with the 800 or still in break in mode, although it sounds good, rpm's are consistent 8250-8300. The 850 will actually run reasonably with the turboed sled mostly in the trees and in some tight situations it has out shined it, where the stock 800 either turns out or will poach a track to keep up in some of the bigger terrain. I will likely replace the turboed 800 with another 850 and I'm thinking my turbo days might be over.
These of course are my findings...

06redrevx · Mar 15, 2019

I had a very sorted and great running 16 Axys 800 and this year I bought a 19 850 Axys<div><br></div><div>I didn't realize just how well the 850 ran until I jumped on my old 800</div><div>Where the power of the 800 would flatten out, the 850 will just pull and pull HARD. After break in of the 850 it is a very impressive motor. The 800 might have a slight advantage at initial spool up but it all over after that! </div><div>Very impressed with the 850. Only adds are a SLP cooker can so far</div>

2XM3 · Mar 15, 2019

A good turbo 800 (210+ hp) will leave a 800 or 850 for dead, period........ I have posted legitimate dyno tests of both 800 and 850 in other threads, we also have a few of each in our riding group, (2019's) the 850 in fact does make more power than the 800, but we are not talking a huge difference:face-icon-small-dis compared to a modded motor or forced induction application. If I was doing a new sled next year at this point i'd do the 850 with the motor updates , at the current discounts right now i'd go 800 IMHO:face-icon-small-coo

http://www.amsnow.com/~/media/image...0219/snodt0219_agraphchart.jpg?mw=1000&mh=800

mountainhorse · Mar 15, 2019

To me... if the 850 were a reliability advantage over the 800 the same year 800... I'd say go with the 850... just can't say that in good faith.

I think that Polaris admitting that there was a big problem with the PTO bearing and changing out the bearing to a different one with a snap ring on it for all the 2020 850's is a good step in the right direction... I'll be curious to see if the 2020 850 production sleds knock it out of the park on the second year of production... I see no reason to believe that they won't with all of the production sled feedback from customers and the warranty claims/replacement-engines from this year.... they should be on top of their game.

.

greasemonkey3406 · Mar 15, 2019

I hope so cause this sled has completely ruined my riding season.

XC500mod · Mar 15, 2019

this winter i have ridden a stock 800, stage 2 800, my stock 850, and an 800 with 7lbs of silber boost. the 850 pulls much harder and further than the 800s both stage 2 and stock you notice the difference when the 800s stop moving, the 850 keeps going and going. after riding the 800 with silber 7lbs and then my 850 and then the 800 turbo again, i would say without a doubt the 850 is closer to the silber with 7lbs than it is to the 800.

i have a video of a stock 800, stock 850, stock doo 850, 2015 800 silber 10 lbs, and a 2016 800 silber 7lbs racing up a face. it was about 600 yards, the 2016 800 with 7lbs took it in the last 50 feet by a sled length. the polaris 850 was second, doo 850 third, 2015 boosted 4th, and stock 800 last. i would post it, but i don't have the tech skills nor desire to learn.

Jaynelson · Mar 15, 2019

Ridden both quite a bit this year in the same spots. 850 is carrying speed and packing the skis up climbs that the 800 is clawing it’s way up (pipe or no pipe). The on/off throttle response isn’t a big improvement on the 850...but the climbing power is IMO. Surprised to hear anything otherwise from what I’ve seen honestly

akpowderhound · Mar 15, 2019

My 850 out of breakin will embarrass my stage 2 Axys 800 any day of the week.

bobback · Mar 15, 2019

I rode a demo 850 last weekend for 2 days. I would try to get it stuck then hammer down and it would just keep pulling; was very impressed. Put on 120 miles over 2 days, no issues at all. Granted had 800 miles on sled for whatever that's worth.

gonehuntnpowder · Mar 15, 2019

Haven't been on one, but a friend demo ride one and said it was much harder to get and keep on edge than his 16. Said he was really dissapointed. Anyone that has one have any thoughts???? Hoping to snow check one.

06redrevx · Mar 15, 2019

gonehuntnpowder said:
Haven't been on one, but a friend demo ride one and said it was much harder to get and keep on edge than his 16. Said he was really dissapointed. Anyone that has one have any thoughts???? Hoping to snow check one.

<div><br></div><div>Should be way easier to get on edge than his 16.</div><div>These new sleds with the react front suspension are silly easy to ride.</div><div>Makes me wonder if his suspension settings are way way off?</div>

turboless terry · Mar 16, 2019

gonehuntnpowder said:
Haven't been on one, but a friend demo ride one and said it was much harder to get and keep on edge than his 16. Said he was really dissapointed. Anyone that has one have any thoughts???? Hoping to snow check one.

That is completely wrong. I had a 16 that I turboed and sold to my buddy. I still ride it all the time. It feels like a boat anchor compared to the 850 or my alpha. The new 850 is better at everything. I don't know that the motor is a huge difference but it will be mapped better for 2020. The best thing about it is the front end. Night and day from a 16. Order one up. You won't be disappointed.

bobback · Mar 16, 2019

gonehuntnpowder said:
Haven't been on one, but a friend demo ride one and said it was much harder to get and keep on edge than his 16. Said he was really dissapointed. Anyone that has one have any thoughts???? Hoping to snow check one.

Impossible- unless the 850 was really,really set up wrong. I was impressed with how quick it got up on its side when I rode the demo.

Chadly · Mar 16, 2019

I personally don't think the 840 compared to the 800 HO is that big of a difference. It's definitely not the difference between the 800 etec and 850 etec. I think the 840 has more top end than the 800 HO and that is where it is noticeable in WOT pulls. I still think the the Patriot is worth the money over the regular 800 though and snow checked a 2nd one for a back up sled next year!

Jaynelson · Mar 16, 2019

gonehuntnpowder said:
Haven't been on one, but a friend demo ride one and said it was much harder to get and keep on edge than his 16. Said he was really dissapointed. Anyone that has one have any thoughts???? Hoping to snow check one.

Ya that’s totally backwards....he either has experienced some really weird suspension settings (they would have to be weird by a LOT)....or just has no idea what he’s talking about. The front end is a big improvement and substantially reduces effort over previous sleds. The first couple rides it’s almost a bit much until you get your body inputs dialed down

Sheer · Mar 16, 2019

I had an 18 axys and now i got a 19 850... the 850 stock to stock walked all over my old 800... the only thing the 800 had was a bit more bottom end snap... after that the 850 is pretty much better in every way... i have the re-flash and that made a huge diffrence to the 850... it was a bit doggy before... and real fat on the bottom but the flash was much better... also the failures on here with the 850 are bigtime overhyped if u ask me... i havent even went through a set of plugs on mine

Nitroused383 · Mar 16, 2019

The stock clutching leaves a bit to be desired but they still pull pretty hard up top. My dad and brother both have 850's that are well broke in with pro quick drive gears and slp cans. My dads has stock springs / helix with polaris 72 gram weights and my brother has MDS 850 weights / springs and the throttle response / snap is huge. My brothers 850 rips out of the hole and has amazing backshift. They are both 163's and will keep up with my 18 Mountain Cat 153 which says a lot lol.

cvcustoms · Mar 16, 2019

Aside from the pure power differences of the two motors the overall engine package is much better on the 850. The upgraded electrical harness with sealed connectors, new TPS sensor, fuse box, exhaust valve design is far superior on the 850 vs the 800. In terms of power I can’t give a pure stock opinion as both my sleds 800 vs 850 have been un-naturally aspirated since day one. One good thing about the 800 is it is more turbo friendly from the factory, no need to change out the head to run pump gas if you want to.

www.cvcustoms.com
Home of the 850 PIDD Power Up Cable

800 VS 850 Motor - The Truth!

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