Polaris rmk 850's

[guido88gt]

Is anyone having issues with fouling plugs. Sled is bone stock and was reflashed. Cant even get it on the trailer before it fouls a plug from over fueling. Ready to burn this POS.. help.. 2019 rmk 850.

 

[pfi572]

I think it was a problem with the 850 during break in from what I remember reading .
With the re-flash is sled put back into break in mode ?

 

[gedakbx]

try one heat range warmer plug

 

[AreWeThereYet]

2019 850 sks 66hrs, I know I have been flashed once maybe twice,.. no plug issues here. Original plugs, almost 2000km

 

[adamg]

My 2019 has never fouled a plug, 3000km on it now. But it seems like some of them have this problem chronically and no one knows how to fix it.

The only technique thing I can mention is that I don't warm the sled up much with idling. Once it shows 0 deg C I start moving it, and if I don't need to move it, I shut it off until I do need to move it. So if you are letting it idle to warmer temps than that, maybe don't.

 

[gunner3006]

I think it was a problem with the 850 during break in from what I remember reading .
With the re-flash is sled put back into break in mode ?

I believe it was in the New Polaris 850 thread. If I’m not mistaken there was a few that fouled plugs?

 

[Danbot]

My 2019 fouled many spark plugs warming up from cold until the 2019.5 flash. Hotter plugs helped alot, BPR7ES

 

[AreWeThereYet]

I also shut my sled off with the key switch, and not the kill switch. If i use the kill switch it will sometimes back fire, then take a couple pulls to start.

 

[TDR]

Most 2019 need to be reflashed. There were 2 different ones. The first one fixed mine. After that no issue just smiles.

 

[gdhillon]

My 2019 has never fouled a plug, 3000km on it now. But it seems like some of them have this problem chronically and no one knows how to fix it.

The only technique thing I can mention is that I don't warm the sled up much with idling. Once it shows 0 deg C I start moving it, and if I don't need to move it, I shut it off until I do need to move it. So if you are letting it idle to warmer temps than that, maybe don't.

so you just putt till it gets warm? I was under the impression touching the throttle under 90 was a no no for these/polaris sleds? (Mine is a 20 800)

 

[LUCKY 7]

I thought that too

so you just putt till it gets warm? I was under the impression touching the throttle under 90 was a no no for these/polaris sleds? (Mine is a 20 800)

 

[adamg]

so you just putt till it gets warm? I was under the impression touching the throttle under 90 was a no no for these/polaris sleds? (Mine is a 20 800)

Yeah, I want to start moving it at 32F, and I'll baby it until closer to full operating temp which manual says is 120F 49C.

 

[TDR]

Yeah, I want to start moving it at 32F, and I'll baby it until closer to full operating temp which manual says is 120F 49C.

It will help but won’t solve the problem. Almost every 19 needed at least 1 reflash. Save yourself the grief of changing plugs on the side of a mountain.

 

[adamg]

It will help but won’t solve the problem. Almost every 19 needed at least 1 reflash. Save yourself the grief of changing plugs on the side of a mountain.

OP said the sled is reflashed, what more are you recommending?

 

[AreWeThereYet]

OP said the sled is reflashed, what more are you recommending?

There was 2 not just 1 reflash for the 2019

 

[bsoluk]

I had two reflashes on my 19 850 and still fouled plugs. Ended up trading it for an alpha.

 

[Teth-Air]

My 2019 fouled many spark plugs warming up from cold until the 2019.5 flash. Hotter plugs helped alot, BPR7ES

I ran the 6's, even warmer and iridium. They helped noticeably.

 

[gedakbx]

I ran the 6's, even warmer and iridium. They helped noticeably.

in what year of 850?

 

[Teth-Air]

in what year of 850?

It's a 19 with the latest flash. I went back to the 9's being worried about the leaner flash but it still ran better with the 6's and the 2020.5 flash.

 

[slopok]

I will just add this I have a 2021 with about 200km on it flatland SK , but no fouling zero issues super crisp very happy with how it runs . So not sure if it has a new program but it runs great.