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MY 17 AXYS 800 H.O. Issues

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po1ar1s

Member
Messages
31
Age
35
Location
Maine
Country
USA
Years Snowmobiling
25
Snowmobile
MY XCR 600 MY Assault 800
Being a dealer we get to repair a lot of snowmobiles throughout the winter. Sometimes we'll notice a trend, and sometimes just one time weird issues. Either way I figured I would share some of these issues with you guys. Might possibly help you to diagnose an issue you are having with your snowmobile. Not all of these are only on the MY 17's, I'll mention on what MY sleds. I'll add to this list if I can think of anything else and maybe update it throughout next season. Please comment with other engine issues you guys may have had. We've had some engine failures but no two sleds failed for the same reason so I don't feel it's worth mentioning.

1. Thermostat- yes it's a weird issue to have, but we've replaced a few of them this year. One of them had even caused some damage to the head. We've only seen this on MY 17's so far.

2. Intake reeds- 2015 the new V-force reeds were bullet proof, 0 issues. 2016 same results. 2017 we had one customer lose a complete petal. I mentioned this to engineers at the dealer show and they are aware of it. Apparently the mold for the cage was getting worn and caused some issues to show up on MY 17 sleds. They are aware of the issue and have taken corrective measures.

3. E-VES guillotine. We've had several of them break. Some of them just lost the sections in the transfer ports, some the center guillotine broke. One of them took out the engine, other's didn't. We saw this on MY 16 and 17 sleds.

4. E-VES cable. We had a MY 17 have the cable actually break. We only saw this once since Polaris has been running the E-VES system.
 
Did you come across any relay issues? Bogie wheel failures? My 15 the bottom chaincase bearing went out last year at 2,600 miles. Took out the chaincase and drive shaft. Fortunately they covered it all with my 4 year warranty. The chaincase was serviced each fall and was full of lube. No leaking either.
 
Thanks for posting this .

I'll tell what I've seen since the axys came out.

2 axys 800's let go because of bad pto crank bearings from factory.

1 blown up because of red injectors. All axys 800's have yellow ??? So??

Several blown up with aftermarket pistons , pipes, cans and fuel controllers .

The light weight suspension wheels delaminating are a pita
 
It's a good problem to have and while it's really minor compared to the engine exploding, I know many 17s, including my own, are overrevving pretty badly. Any customers mentioning this? Mine will bounce off 8450-8500 once in a while and sit around 8350-8400 wot
 
So it's over reving on first hit? Most likely because of rapid upshift due to a lack of traction then settling in at 8300-8400?this part sounds normal. Keep your clutching more in sink will correct this.sled is to revy as I call it.
 
Yeah that's pretty much it. I'm unstudded so most of the time it spins on a launch. What do you mean by keeping it in sync? It's bone stock right now but I was planning on putting 10-68s in it, unless you recommend something else. I was planning on lowering the stock 1.68 gearing down to 1.73 too to help spin the 137x1.5"
 
Keeping the clutching balanced, is that a better word..you would benefit from that gear change with that track. If you gear down as you speak you will need to add load to the clutches.the problem with conventional weights is not being able to load the clutch where you want it. If your not a tinkering type of guy then the 68s are s good choice, they could use more base weight thoe. Your also going to have to speed up the secondary clutch, you should anyways...48-44 and 46-42 all on one helix, with the stock spring ,68s in front , or maybe 70s, (more weight if you have a good one) with 120-300 or less finish primary spring.
 
Thanks Heath, I'm gonna screenshot this so I can find it again this fall lol. And the Axys is the first sled I've ever attempted to work on so I'm still a newbie at a lot of this stuff, especially clutching. My clutches were too hot to touch last year when beating on it off trail so I knew something had to be done.
 
And yes, Brock feel free to clean up our comments if you wanna keep this thread more on point. I certainly appreciate the advice but it wasn't the intent of my initial post.
 
17s and any 16 that had the reflash done are all way to lean at cold start up, start sled at 30 degrees, shortly after it will stall from being to lean, restart and will be fine threw warm up.
 
racerdave said:
Did you come across any relay issues? Bogie wheel failures? My 15 the bottom chaincase bearing went out last year at 2,600 miles. Took out the chaincase and drive shaft. Fortunately they covered it all with my 4 year warranty. The chaincase was serviced each fall and was full of lube. No leaking either.
Click to expand...

I was just talking about engine issues, but absolutely 0 relay issues. Yes we've pulled them off to apply die-electric grease but that's it. Bogie wheel failures are quite common, along with bearing failures. We've been able to get quite a few of them warrantied if you're still under the 1st year of warranty. A premature chaincase bearing failure like that imo is either a defective bearing or a bent driveshaft. There's not reason for that bearing to be letting go so soon.
 
Brock said:
Thanks for posting this .

I'll tell what I've seen since the axys came out.

2 axys 800's let go because of bad pto crank bearings from factory.

1 blown up because of red injectors. All axys 800's have yellow ??? So??

Several blown up with aftermarket pistons , pipes, cans and fuel controllers .

The light weight suspension wheels delaminating are a pita
Click to expand...

I've also seen a pto bearing let go with relatively low miles. According to the engineers they switched to a bearing with a plastic cage to prevent this. Supposedly the steel cage couldn't handle the fatigue on the PTO side of the crank and would come apart sometimes prematurely. We had an engine failure on our 2015 demo because of a cracked injector. Wheels delaminating is a pita.
 
Dr.Notadoo said:
17s and any 16 that had the reflash done are all way to lean at cold start up, start sled at 30 degrees, shortly after it will stall from being to lean, restart and will be fine threw warm up.
Click to expand...

I talked about this with the engineers at the dealer show. This was more of an issue on the 16s but we've still seen it happen on some 17s. Like you said it's a calibration issue. The injectors obviously have a range that they have to flow, some will flow more and some will flow less. If you end up with one that's on the leaner side of the spectrum then this is where it will stall. Just need to burp the throttle a little bit and it'll come out of it, or if it stalls it'll restart and won't happen again. It's kind of a nuisance but it is what it is, for now. Not any worse than having to crack the throttle to start a carb sled IMO.
 
This motor seems to holding up fairly well.

It can be improved for sure.
The piston weight, tolerances,ecu mapping and unreachable pipe heat.
Lots of power left on the table here as the full potential of this motor is never reached(detuned). All manu's do this and don't need to as great power can be achieved with reliability?
 
I agree it is a very durable engine. Most of the engine failures we've seen so far is due to something out of the ordinary. Like the crank bearings, we never had crank issues on the CFI 800 engines. The E-VES guillotine breaking and falling into the engine, this shouldn't be happening. If they could get their quality control up, there would be no reason these engines couldn't last 10,000 miles.
 
Haulin on here had one guillotine break and go inside motor too. I forgot that one. Top end rebuild because of it
 
QC cost money and lowers the shareholders earnings.
 
IMG_0277.JPG
This is a stock 800 with turbo, however no mapping changes in this area, note coolant temp is 55deg. And note the AFR reading, this is in non eth fuel mode, most of the timd my gauge is stuck at 16 sled hasent been running long. If you stay next to it and start to hear it lean out you can burp it and keep it running..
 
racerdave said:
QC cost money and lowers the shareholders earnings.
Click to expand...
Dave?
Do you think Polaris doesn't have any qc? I agree on the cost.

Do they just take the word of the manufactures that make their parts for them?
 
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