Pro-800 Cylinder skirts breaking?
- Thread starter Pro-8250
- Start date
J
jsandgren10
Well-known member
Do most guys think just a piston change will alleviate the issue? I see indydan also can reinforce the cylinder skirts was wondering if that should be done as well.
I have 450 miles on mine will run it another year and then replace pistons but curious if anything else should be done
I have 450 miles on mine will run it another year and then replace pistons but curious if anything else should be done
Explain this..... It failed the leak down test.
Has anyone done a poll on stock vrs mods to see if one is more prone to break a skirt? All the ones in my area that have gone down are stock. The turbo is still running strong.
My '11 has just under 2,000 turbo miles w/o issue and my '12 got a new motor at 630 because of an oil line fitting falling out of the pump. I will probably get the IndyDan skirt mod and pistons done on my '11 since it's due for pistons anyway. I've turned up the oil pumps on both. I've always been a big fan of having a backup sled, but I have used it alot more for faulty parts than me breaking stuff which used to be the norm.
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snowmobiler
Well-known member
LOL.
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knifedge
Well-known member
-- Some big bore kits make the skirts even thinner and they run great with correct design pistons. Skidoo has thinner skirts than Polaris stock. Whatever kit you research and end up going with, use all the components the kit manufacture recommends because there are different theories as to the CFI engine problem.
--The more you run your Polaris OEM engine, the more your hammering away at your skirts, no matter how thick they are.
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Super Sled
Well-known member
My motor ran great until a piece of the skirt popped a hole in my crank case!! Was 30 miles into the back country but was able to limp it all the way out!! Sled is 2011 and I had 2400 miles on it!!
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Wood
Well-known member
I understand the issue at hand being the inconsistency with piston dimensions....what fails to make sense is using a forged Wiseco piston to ensure long term reliability by way of aftermarket fixes. Seems ironic, no?
Also, why are the majority of failures showing up on RMKs....the SBAs and Rush models don't seem to have reports of this issue. I can only assume the extra piston load from long, WFO runs having an impact. No doubt this type of riding will show this deficiency much quicker than flatland style riding.
I have no issues running a somewhat less than reliable motor for the trade-off of what this chassis/motor package offers. Too bad this type of failure can cost you more than a piston a re-nick'd jug. That is the bad part.
Polaris can't seem to win with this 800CFI motor package...first gen is a nightmare due to mapping. The CFI-2 is now a liability due to an apparent lack of QC/engineering design.
The million dollar question is how widespread this issue really is....according to the poll on here, it appears as though there is a failure rate of approx 10%, according to the 300+ or so that responded. It would be nice to know the mileage and year as well. Is it more prevalent on 2011 sleds or equally likely on the '12s.
How does it make any sense that there are less failures with turbo'd sleds than stock? Makes no sense unless it is an RPM/harmonic related issue.
If the Roseau Retards would just hire the 'Zuki motor guy we could be arguing about other things....like the world's best shock package that's calibrated by stillborn monkeys (Walker Evans).
Is it that hard to build a solid/reliable sled after 50 years?.....or are all the insiders just sitting back laughing at us suckers because we keep putting our debt ratios way outta whack to buy their crap.......ya'll been punk'd.
Also, why are the majority of failures showing up on RMKs....the SBAs and Rush models don't seem to have reports of this issue. I can only assume the extra piston load from long, WFO runs having an impact. No doubt this type of riding will show this deficiency much quicker than flatland style riding.
I have no issues running a somewhat less than reliable motor for the trade-off of what this chassis/motor package offers. Too bad this type of failure can cost you more than a piston a re-nick'd jug. That is the bad part.
Polaris can't seem to win with this 800CFI motor package...first gen is a nightmare due to mapping. The CFI-2 is now a liability due to an apparent lack of QC/engineering design.
The million dollar question is how widespread this issue really is....according to the poll on here, it appears as though there is a failure rate of approx 10%, according to the 300+ or so that responded. It would be nice to know the mileage and year as well. Is it more prevalent on 2011 sleds or equally likely on the '12s.
How does it make any sense that there are less failures with turbo'd sleds than stock? Makes no sense unless it is an RPM/harmonic related issue.
If the Roseau Retards would just hire the 'Zuki motor guy we could be arguing about other things....like the world's best shock package that's calibrated by stillborn monkeys (Walker Evans).
Is it that hard to build a solid/reliable sled after 50 years?.....or are all the insiders just sitting back laughing at us suckers because we keep putting our debt ratios way outta whack to buy their crap.......ya'll been punk'd.
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347strokin
Well-known member
How's Polaris handling these warranty issues? How long are you guys waiting to get back on the snow?
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pura vida
Well-known member
i was up and running in a week and my dealer was apologizing to me b/c they felt should have been sooner... would have been three days (five if you count the two days they were closed) if it they hadn't been waiting on the adjuster.
pv
Pura Vida have you any thoughts on this? I thought it would bring the pictures with it.
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snowmobiler
Well-known member
looks like rings are toast.among another things
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Super Sled
Well-known member
I'm presuming those are hairline cracks in the bottoms of the cylinders? The detonator has been set..... 
Took right at 7 weeks for my 11 to get back up and going
Sent from my MB860 using Tapatalk 2
Yes Sir, hairline cracks. When it failed the leak down test it gave us a closer look. Look at the bottom of the piston skirts, they are hammered. With 832mi and richer than 40/1 oil.
Mine took about 3 weeks. What's worse is that a buddy has been waiting for a back ordered fuel pump for much longer.
Hmmm.... Pot? Kettle? I hear your gramma callin'.
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pura vida
Well-known member
i don't honestly. obviously you have some pretty serious issues that need to be taken care of. but i hesitate to give my opinion, that is starting to get above my pay grade pretty quick, especially since i can't look at it in my hands. i've blown up countless motors but some of these issues are pretty new to me. i actually haven't seen the rings fail like that on the pros i've been around and had apart. hell, my pistons looked great when my skirt broke. best advice i can say it hopefully you have a GOOD dealer and can talk to them. sorry, i know it isn't much...
pv
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