Update for everyone that is curious. The stator was our problem causing no reverse. Not making correct voltage / lights would start to flicker and stalling when going into reverse! The flickering headlights at idle are probably the biggest sign of a weak stator. Hopefully this helps!
There is no need for a fix kit on the 2016 and up 800 motors. OEM replacement works just fine. 2016 brand new spec is 125 psi. Also the axys 800 is considered bullet proof for a two-stroke mountain snowmobile engine. Those who blew up or damaged their engine early, more than likely did not use the machine properly. At 10:20 this is a cause for having low compression early. Hope this helps
@@JT2JZ Does it do the quick stall upon pressing the reverse button? Does the reverse light show up on the screen? Does it not work everytime or sometimes?
I like that you left the engine in the sled for once. Seems like everybody wants to pull the whole engine out all the time for top end rebuilds. Thanks for the info!
Whatever ended up happening with your friend's sled. I am curious to find out how many miles you have on the top end rebuild, on the Pro X Pistons kit. Did you get the reverse issue worked out.
The stator was the root cause of no reverse. Not a compression issue. The sled is still running good but unfortunately we haven’t put a lot of kms on it as this winter season has been horrible for snow ( I can still see my lawn ). I’ve never experienced a winter this warm in my entire life. Scary stuff.
@JT2JZ The weather patterns in the past few years have been getting more and more unpredictable. I am from Wisconsin. We ended up with 50° weather Tornadoes and Large Hail, which destroyed any chances of getting back out. Put on about 250 miles in January.
@jordanthomas2210 I live pretty close to revelstoke ( one of the best mountain sledding areas in the world ) and currently there is not enough snow to groom the trails into the alpine. In the past when you had a bad snow year you go to revelstoke and they always have snow no matter what. Pretty heavy drought this year. Im very nervous for summer. They are predicting a bad fire season now without any mountain water run off over the spring. I’ll keep you posted on the sled if we get it out more but it’s not looking promising.. this weekend we are using quads and dirt bikes
I just did a video series on my channal ! I sent my cylinders to a shop to get them honed and they said we can risk a hone but we might be doing more bad then good... I then echanged them for new replated cylinders and I am so glad i did ! Started fresh with brand new wiseco pistons ! Honing a Nikasil cylinder is taking a chance... The best thing you can do is ball honing or using a scotchbrite pad. Nice video though !
Ya I think the nikasil layer is extremely thin. Less is definitely more when working or refinishing them. I’ll let you know if it doesn’t work for us this season. Our sled is getting pretty old and rough around the edges. Basically just trying to get one more season out of it without spending a ton of money before upgrading
@@JT2JZ I know what you mean ! It's called living off of borrowed time ! Did it last year ! Only had 100 and 105 compression and only replaced the pistons and rings ! Finished off the season that way ! This year added new parts !
Still haven’t got the chance to break it in and retest unfortunately. It’s been -40c for what seems like a month now. Patiently waiting for the weather to cooperate
@@JT2JZ Yes sorry i should have been more specific. Primary clutch first presented an issue like you showed- would die trying to reverse. Shaft overheated from what i was able to tell, no salvaging it or rebuilding just needed to replace.
Haven’t really rode it yet to give the sled a good heat cycle and let the piston rings seat. Hopefully this weekend we will put some more time on it and take it for a good burn As of right now still no reverse.
The compression wasn’t much different to be honest. Maybe 5psi better if that. We still don’t have reverse so maybe it wasn’t the root cause of all the issues.
Update for everyone that is curious.
The stator was our problem causing no reverse. Not making correct voltage / lights would start to flicker and stalling when going into reverse!
The flickering headlights at idle are probably the biggest sign of a weak stator.
Hopefully this helps!
Was looking at one of these for my son, this video scared me straight - thanks.
They are cheaper to buy for a reason in my opinion
There is no need for a fix kit on the 2016 and up 800 motors. OEM replacement works just fine. 2016 brand new spec is 125 psi. Also the axys 800 is considered bullet proof for a two-stroke mountain snowmobile engine. Those who blew up or damaged their engine early, more than likely did not use the machine properly. At 10:20 this is a cause for having low compression early. Hope this helps
We are still struggling with no reverse. Any other knowledge with loosing reverse?
@@JT2JZ Does it do the quick stall upon pressing the reverse button? Does the reverse light show up on the screen? Does it not work everytime or sometimes?
Quick stall if I remember correctly. Happens every time.
Bro has a MK4 Supra just chillin in the background with a M/T SS tire on it 😅
She’s a 10 second 6 speed supra. I have some older vids you can check out if you are into those cars
I like that you left the engine in the sled for once. Seems like everybody wants to pull the whole engine out all the time for top end rebuilds. Thanks for the info!
I like taking the path of least resistance! Hopefully the video helped. Remember to drain your coolant before you start!
did you end up reusing the stock head bolts. my 18 rmk needs a rebuild and im trying to save money where possible
Whatever ended up happening with your friend's sled. I am curious to find out how many miles you have on the top end rebuild, on the Pro X Pistons kit. Did you get the reverse issue worked out.
The stator was the root cause of no reverse. Not a compression issue.
The sled is still running good but unfortunately we haven’t put a lot of kms on it as this winter season has been horrible for snow ( I can still see my lawn ). I’ve never experienced a winter this warm in my entire life. Scary stuff.
@JT2JZ The weather patterns in the past few years have been getting more and more unpredictable. I am from Wisconsin. We ended up with 50° weather Tornadoes and Large Hail, which destroyed any chances of getting back out. Put on about 250 miles in January.
@jordanthomas2210 I live pretty close to revelstoke ( one of the best mountain sledding areas in the world ) and currently there is not enough snow to groom the trails into the alpine.
In the past when you had a bad snow year you go to revelstoke and they always have snow no matter what. Pretty heavy drought this year.
Im very nervous for summer. They are predicting a bad fire season now without any mountain water run off over the spring.
I’ll keep you posted on the sled if we get it out more but it’s not looking promising.. this weekend we are using quads and dirt bikes
@JT2JZ l definitely see why you would be nervous. I have heard a lot of the same. Ride safe🤘
@jordanthomas2210 you as well brother
I just did a video series on my channal ! I sent my cylinders to a shop to get them honed and they said we can risk a hone but we might be doing more bad then good... I then echanged them for new replated cylinders and I am so glad i did ! Started fresh with brand new wiseco pistons ! Honing a Nikasil cylinder is taking a chance... The best thing you can do is ball honing or using a scotchbrite pad. Nice video though !
Ya I think the nikasil layer is extremely thin. Less is definitely more when working or refinishing them. I’ll let you know if it doesn’t work for us this season.
Our sled is getting pretty old and rough around the edges. Basically just trying to get one more season out of it without spending a ton of money before upgrading
@@JT2JZ I know what you mean ! It's called living off of borrowed time ! Did it last year ! Only had 100 and 105 compression and only replaced the pistons and rings ! Finished off the season that way ! This year added new parts !
the metal fix gasket under the cylinder, is there a gasket below and on top of that metal gasket? I only have 1 from dealer with rebuilt
Did you have any bogging issues I have no reverse either did too end thinking of stator…
No bogging issues but my root issue was stator and not compression. I think you are on the right track
120 is still goo if it drops below 100-90 time for new pistons and rings
I believe our actual numbers were 110 and 115.
how much compression did it have after the new pistons and rings?
Still haven’t got the chance to break it in and retest unfortunately. It’s been -40c for what seems like a month now. Patiently waiting for the weather to cooperate
How long is the sled running after this repair? What is the new compression
Old compression was 110 and 115 if I remember correctly. Never tested it new. Sled hasn’t been ran much. We believe it still needs reeds
These are good sleds at the end of the day
The clutch could be the culprit with no reverse, I had that issue last year on my 800 rush. 5k miles.
Primary clutch? What exactly in the clutch wore out if you don’t mind me asking?
@@JT2JZ Yes sorry i should have been more specific. Primary clutch first presented an issue like you showed- would die trying to reverse. Shaft overheated from what i was able to tell, no salvaging it or rebuilding just needed to replace.
Good to know. Thanks for the input!
120 is spec for the newer axys motors I believe
I thought they were supposed to be 130-140ish new?
You may be right though. The sled may have needed reeds more than a top end.
@@JT2JZ I’m pretty sure spec is 120, I know the new CFI motors are a lot lower then normal years!
Thanks for the info man. Reeds will be next on the to do list for sure. Hopefully that will give us back reverse again
@@JT2JZ still got no reverse? What rpm does the sled idle at? Have you done a compression test since the rebuild? Outta curiously what was it?
Haven’t really rode it yet to give the sled a good heat cycle and let the piston rings seat.
Hopefully this weekend we will put some more time on it and take it for a good burn
As of right now still no reverse.
Your spark plug cap in inversed ?
I believe it’s normal? Basically a stock sled
What was the compression after the rebuild?
The compression wasn’t much different to be honest. Maybe 5psi better if that.
We still don’t have reverse so maybe it wasn’t the root cause of all the issues.
How did you get the coolant out of bottom end?
I used lint free paper towel. Using a flat head screwdriver I just pushed the folded up towel into the bottom end and it actually worked pretty good.
What brand pistons did you use ?
Pro X pistons.
Any updates on this sled ??
The sled still runs pretty good. Still doesn’t have reverse though.
I never thought 120 psi was low.
It probably isn’t that low on these older Polaris engines.
I’m a skidoo guy so I though it was low when it likely wasn’t.
The coolant in the bottom end is no good my friend!
Ya it took some time to clean that out
Bye bye crank your days are numbered
She’s still running strong. We got the coolant out before reassembling obviously