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Polaris: Pro-Ride 2010 and up, all models in the Pro-Ride chassis
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  #1  
Old 11-19-2018, 10:30 PM
Rmalo Rmalo is offline
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Default 2015 Pro RMK Piston/Cylinder Scoring

These pictures are from a 2015 Pro RMK with only 400 miles on it. I am wondering if anyone has an idea as to what would cause this type of wear so quickly? Poor compression 90psi MAG / 70 psi PTO is what led us to pull the jugs and inspect pistons/cylinders.

I noticed right away that the pistons/cylinders looked dry and were not getting enough lubrication. I am going to check crank run out and inspect case for any damage. If the lower half is ok will a hone/replate fix the damage to the cylinder?

Thanks in advance to any reply's. This is my first post on SnoWest and I appreciate all the information you guys post on here.
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Old 11-20-2018, 09:39 AM
Octanee Octanee is online now
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I'd guess lack of lubrication, looks like some aluminum stuck to cylinder wall who his a good sign of that. Supposedly the sleds. Are way lean from the factory, I turned my pumps up so I seem to be around 35:1 or richer.
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Old 11-20-2018, 02:10 PM
Vincenthdfan Vincenthdfan is offline
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Read up too on oil caps not venting properly.

They can create a vacuum and starve motor of oil too...lots and lots of reading in your future. (Been there, done that)
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Old 11-26-2018, 08:16 AM
RMK900Tractor RMK900Tractor is online now
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More info....


https://www.snowest.com/forum/showthread.php?t=440993
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Old 11-26-2018, 10:11 AM
SRXSRULE SRXSRULE is online now
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It could also be cold seize related. You need to let these engines warm up to 100-110* everytime before you even try and move the sled.
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Old 11-28-2018, 09:57 AM
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Ditto on the warm up and possible cold seize, I like at least 45 to 55 to one ratio on fuel to oil. I had 55:1 on my 11 pro after some issues and it is happy with its new owner now!!
gtwitch in wyoming
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Old 11-30-2018, 09:45 AM
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X3 ON Warm up!!!

Yes the do run, or move if you hit the ran after they are running... Doesn't mean.. she is ready to rip.. got to warm her up.. slowly ... then she will scream later!!!

wait till u see the temp come up to 100 before moving!!
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Old 11-30-2018, 12:20 PM
peaceofwork peaceofwork is offline
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Warm it up? I thought these sleds were designed to run in the cold wth? Seriously though warm it up even after a hard run and shut down once refiring it give it a moment tor temps to equalize before hitting on the hammer again.
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Old 12-04-2018, 01:09 PM
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What pistons, stock or aftermarket forged? Seen a few seized forged pistons, definitely not as forgiving as the stock cast ones.

But, oil starvation might very well be what caused this. Vent oil cap, change fuel filter, replate cylinder, get some stock pistons to put in it.

Should be good to go
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Old 01-16-2019, 08:55 PM
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Old 01-17-2019, 07:45 AM
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