New pro crank grenades

[1Mike900]

I just read the service bulletin again, the PTO is fed by the possible kinked hose! Bet he or his dealer never heard about it?

 

[snowmobiler]

grenades sounds cooler than stuck bearing

 

[Butta]

I suspect Doo,s will see these problems. The reduction of OIL. The lubricant that keeps the motor spinning to meet EPA reg,s is problematic. I would simply add some oil to the fuel tank.A proven fact then an engine with more oil will reduce friction and make more ponies has been demonstrated many times over.Running a motor pinned for long periods of time with reduced oil does not set well with me. I run 32-1 premix in my Mod motor 880.

This goes back to 2 stroke jetting with respect to carbs, though...if you increase the oil:fuel ratio, then you actually LEAN the mixture out. I'm curious if this methodolgy holds true for EFI sleds, since, in effect, the injectors are the "electronic jets". If you displace fuel with increased oil, aren't you in turn running a leaner Air:fuel ratio? At what point does it become counterproductive? I think the real solution is to increase the oil pump output so that it doesn't replace fuel through the fuel pathways, and also doesn't interject oil into the injectors (not sure if that's good for them or a quick way to clog them up?)

 

[94fordguy]

Thanks for sharing what you found.... sounds interesting. I wonder if the new much reduced oil consumption has something to do with it..... Much less oil to the bearings, so perhaps a shortened life-expectancy? Hard to say, either way it's good to know

So.....out of the hundreds and hundreds of Pro's out there, and the hundreds/thousands of miles that have been put on them, and almost every person absolutely loves everything about it....... Why are there some people that just wait for one thing to go wrong so that they can associate that to every sled? Do some people not realize that any mechanical item in existence can/will break at some point and time. Rarely it's perfect forever, unfortunately reality tells us something can go wrong. Not every sled is perfect and sometimes chit happens.

You polaris guys are sure turning into a bunch of b*****s. Kinda starting to sound like the Skidoo guys. LOL. Yes im sure your getting sick of all these people coming on here saying how bad it is or this happened to the Pro. All sleds have there problems. Just ride what ya got and enjoy it. Im just going have to start riding with the Yamaha guys I guess, oh wait they'll bitch because my sled smokes.

Gonna agree with these guys. Everything in life breaks down and this turned into a witch-hunt real quick due to a short delay on the cause From a personal standpoint, I find it kinda funny; You all know how reliable YOUR sled has been for you, but your worried about something someone else is claiming about it. If I might suggest, RELAX a bit..... I read posts all the time, even from Polaris owners who totally TRASH the 900 RMK... I can't say that I enjoy reading it, but it ultimately doesn't matter because my sled has run EXTREMELY reliably for me and I have gotten more mountain miles out of a single belt than many other people riding all kinds of sleds openly share. EVERY sled can have problems, and likewise, EVERY sled can be reliable... I'd worry more about how you plan to wipe the perma-grin off your face at the end of a good day riding than I would worrying about what another brand/model sled owner thinks of your or my sled... That's what I do. If it works good for you, that's what really matters.

Just MY opinion.

 

[RMKrick]

After looking at this tread I found a air bubble at the tank about half in long.Polaris says it has to be over a inch llong to couse a problem. guess we will see. Anyone know what the rpms should be?

 

[73tmeyer]

lets all be honest here all these pros are new....and all the pros have warranty. no machine is perfect that's what warranty is for!!!

 

[1Mike900]

Just a question, how is this air bubble forming? Is it the oil sloshing around in the tank that is causing foam? You would think that once a vacuum is formed from the pump no air could get in the line, but for some reason it does!

 

[depthcharger]

Just a question, how is this air bubble forming? Is it the oil sloshing around in the tank that is causing foam? You would think that once a vacuum is formed from the pump no air could get in the line, but for some reason it does!

Its from the factory when they add the oil is my guess. I disconected the tubing, got rid of the bubble and it hasnt come back.
I went and looked at one on the showroom floor and it had the bubble just like mine had.

 

[Reg2view]

X2. Bled and rode, never came back. Didn't use much oil during breakin, but wasn't pinned all the time, either. Using more now.

 

[winter brew]

All the mfr's have about a 2% failure rate....have heard of a couple Xp's going down, a couple Pro's and have even heard of a few Cat's. Sell more sleds and you'll hear of more failures.

 

[Reeb]

I suspect Doo,s will see these problems. The reduction of OIL. The lubricant that keeps the motor spinning to meet EPA reg,s is problematic. I would simply add some oil to the fuel tank.A proven fact then an engine with more oil will reduce friction and make more ponies has been demonstrated many times over.Running a motor pinned for long periods of time with reduced oil does not set well with me. I run 32-1 premix in my Mod motor 880.

Dude I run 50:1 in my mod. GP7 premix and had the motor apart this spring to freshen things up.....lots of oil, inside, my motor was immaculate. 32:1 is LOTS of oil. What are you using? Chevron Dino Oil?

 

[Murph]

If I was "fishing" or looking to bad mouth polaris I would have started this thread in the cat section but I came here beacuse I am looking for acutal owner's opinions.

UE-- thanks for the heads up. We've got two Pros and I'm reading everything I can about the motors. First two strokes for us and the 2008-10 D8 motors have a somewhat less than stellar history..

Sorry you took flak over it. I always laugh when I read people's posts about their or their machines abilities.... My guess is there are some guys on here that could make me look silly while riding a D7, M7, etc.

Thanks again for the post.

 

[UtahEdge]

Thanks for all the replies guys. I was really hoping that this is an isolated case. I have been a hardcore Polaris guy since I was 16, until I had to replace 3 cranks in 1 season on my edge. I am hoping that the pro is going to be the sled that will bring me back to Polaris. You guys have all been allot of help. Thanks again.

 

[ak49er]

We lost an inner crankshaft bearing on our 800 PRO RMK at mile 70 of our second ride.

I noticed that the wifes sled was significantly harder to start that morning -14* F and actually pulled her plugs to get it to pull over easier, then later 35 miles in the backcountry, during a mild carve turn, her motor shook and she shut it down.

Teardown revealed failed inner crank bearing, dealer mad no guesses as to why....

I can only guess OEM Bearing failure (cage failure) OR....Oil Starvation to that bearing only????

Dealer was great at getting it in, stripped down, rebuilt and out the door by the next weekend!

 

[AndrettiDog]

I wonder if your crank bearing failure was due to the crimped oil line that others have mentioned. The Polaris racing post mentioned that you should check the line going to the bearing. hmmm....

 

[gman086]

All the mfr's have about a 2% failure rate....have heard of a couple Xp's going down, a couple Pro's and have even heard of a few Cat's. Sell more sleds and you'll hear of more failures.

What WB said (though I believe it's more like 3-4%). The cranks have been solid and no worries. The big issue is the injectors or TSS causing a hiccup when hammering the throttle from the midrange. Still no definitive answer yet and over 20% experiencing this issue including me. NOT a deal killer tho and the Pro should be at the top of anyone's short list for a great mountain sled!

Have FUN!

G MAN