Hey man. Have you ever seen or heard of one of these pistons blowing up? I got this 900 done for the guy and he said he was taking it easy on it and was on about his 15th hour of break-in and then it locked up. Had been running great before that. But i had replaced everything but the head on this motor. I mean new cases and crank and rods and everything. I got everything from rev6 and so its all hot rods stuff, except the pistons and they are rev6. And the one on the mag side, totally exploded. And of course ruined the new case and cylinder. The crank and rods looked fine but it had chunks of piston flopping around in there and that why it knocked a hole in the upper case above the counter shaft. But the only time ive seen a piston do this,is with nitrous. Have anyone of you seen it or know what might have caused it?This is the old style that screws in for model years up through 2016 EPS.
The stock hydraulic tensioner just screws in the hole and looks like a big bolt. Aftermarket manual replacements sometimes use a screw in adapter to mount a bolt in tensioner that uses two bolts or sometimes it looks like a hydraulic tensioner with a bolt sticking out of it.
View attachment 146462
This is the new style that bolts in for 2017 and newer EPS.
The tensioner bolts to the cylinder. There is no adapter.
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This is a Polaris OE tensioner for the newer cylinder.
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The kit I saw this morning on the Internet was this one: 2013-2016 PRO RMK UPGRADED FIX KIT+ FORGED WISECO PISTONSThey say they are upgraded pistons,that are hyp. Casted. But doesn't say anything about being wiesco pistons. Thanks for your reply. Cause i have got to explain this to the customer and it will help having other people saying the same thing that im saying . That it was just a bad piston unless he sprayed it with nitrous or something like that.
Yeah, i was hoping that these pistons were better than the OEM pistons. And i didn't see anything bad about them. And that motor had been rebuilt before and it had Rev6 pistons in it. I ordered the cylinder kit and it came with them,so i replaced them. And i had a new case and new crank,so everything was new , except for the head. I don't know if he will want to rebuild again. Cause ill need new cases, cylinder,pistons and rings and all the bolts. Im thinking that ill take the cases to a guy and see if he can weld up the hole. Its about an inch hole,and it is right under the center of the counter shaft. If he can weld it up,then all he will need is the cylinder and rings. It will all be up to the customer. But i would like to know where i could get some billet pistons for it. Just incase he wants to go back all new. I still have his old cylinder and it wasn't scratched or anything, i just replaced it because everyone was saying you couldn't hone the cylinder and that you had to buy a new one when you did a rebuild. But i seen where a guy was honeing his out. You have any info ,on that?The k
The kit I saw this morning on the Internet was this one: 2013-2016 PRO RMK UPGRADED FIX KIT+ FORGED WISECO PISTONS
Interestingly I went to the Wiseco web site and didn't see any pistons offered for the 900.
From personal experience, Wiseco makes good pistons, I run 'em in my Harley.
Hypereutectic pistons are stronger than cast pistons but not as strong as forged pistons. If I was buying aftermarket parts (non OEM) I don't think I would use anything but forged pistons manufactured by a reputable company. The cost of failure is too great. You get what you pay for most of the time and sometimes cheap isn't really cheap at all.
Polaris recommends against honing they cylinders. They are Nikasil plated which is a hard coating but very thin. Once worn through the cylinder is junk. If you don't have the Service manual for that vehicle you can get a digital download one for about $10 online. It has all the info regarding the OEM specs and rebuilding.Yeah, i was hoping that these pistons were better than the OEM pistons. And i didn't see anything bad about them. And that motor had been rebuilt before and it had Rev6 pistons in it. I ordered the cylinder kit and it came with them,so i replaced them. And i had a new case and new crank,so everything was new , except for the head. I don't know if he will want to rebuild again. Cause ill need new cases, cylinder,pistons and rings and all the bolts. Im thinking that ill take the cases to a guy and see if he can weld up the hole. Its about an inch hole,and it is right under the center of the counter shaft. If he can weld it up,then all he will need is the cylinder and rings. It will all be up to the customer. But i would like to know where i could get some billet pistons for it. Just incase he wants to go back all new. I still have his old cylinder and it wasn't scratched or anything, i just replaced it because everyone was saying you couldn't hone the cylinder and that you had to buy a new one when you did a rebuild. But i seen where a guy was honeing his out. You have any info ,on that?
That Polaris shop should be charged with criminal theft. A quick look a t Partzilla shows an OEM piston kit for a 900 (piston, rings, pin and clips) retails at $189.99Ok. Yeah that's what i had heard,and that's why i bought new cylinder along with everything else,the first time. But i still have the old cylinder that i took out, and was hoping to be able to reuse it since this guy already spent over 6k . And now its all messed up because of that piston. Im going to take the case and see if i can have the whole welded up and if it can be, then ill let the customer know that we will still have to get new pistons and a cylinder and rings. I just didn't have any idea that a oem set of pistons would cost 1200 bucks or more. I had priced them from my local Polaris shop and they want 379. For one piston and 75 for the wrist pin and 26 for the dam retainer ring. Plus 206 per set of rings. Thats fuckin crazy
Well, when i got it to rebuild a couple months ago, he said he had it rebuilt a couple weeks earlier by a guy and he rode it down a gravel road for about 30 minutes and it started smoking and blew up. When i took it apart,there was alot of dirt and mud in the intake. Like two cups full. So if he wasn't lieing about just going down the road then that guy that rebuilt it screwed him,cause he didn't dump out all the mud. I don't know if he was telling the truth, but all i could do is let him know. Now, he owns a duck guiding service and has some young dumdass spoiled guys that work for him and you know they don't take it easy or give a shit about tearing it up. So he will either learn to not let them ride it or he can keep going through this. But i think he had learned his lesson and i think this time he was just going down a gravel road and taking it easy to break it in. He said he would get out and ride it for about an hour everyday. He said he had been stopped on a bridge and was shooting his pistol and got back on it and cranked it up, and drove it about a few hundred feet at about 20 mph and it just went. Now as bad as that piston got blended up,it sure looks like it kept coasting a good ways, cause it made several revolutions to do all of that,but again they do turn high rpms,so who knows. But either way, even if he was running wide open for a short distance,it shouldn't come apart like that. I called rev6 and of course they didn't call me back, until i texted my sales rep and he had me send him all of the pics and he said he would see what he could do about putting the parts under warranty. I dought that will happen, but if it does, that shows me alot about this company. Ill let y'all know. Plus my customer is married to a attorney, so theres no telling what will happen.A quick search for Polaris Ranger parts provided this:
2015 Polaris RANGER 900 XP ALL OPTIONS (R15RTA87/E87) Engine, Crankshaft & Piston R15rta/E87 All Options | Babbitts Polaris PartsHouse
You'll note that item #1 includes 1 piston, 1 pin, 2 clips and one set of rings all for $189. Shipping is $5 for orders over $99.
Either your dealer is trying to rape you or someone in their parts department doesn't know how to read.
I'm not suggesting that you purchase from Babbits and I've had zero experience with them and in fact there may be other Polaris parts sellers that have better offers. You have to do your due diligence and shop around. Sometimes a call can get you a better deal than an Internet price, especially if your order is large.
I think it would be wise to compare the cost of parts and labor to the cost of a professionally rebuilt engine with a warranty by a company such as nFlow. Polaris Ranger/RZR 900 Engine | nFLOW
The basic completely remanufactured engine is $3895 with the standard 6 month warranty. Compared to how much it costs to rebuild yourself, twice, particularly if you have to pay the prices your dealer is asking, that prices is within reason. nFlow has a pretty good reputation on this Forum.
In all the time I've been a member of this forum I've not heard of one person having this much trouble with a 900. I've read about a lot of rebuilds due to air leaks in the manifold and the engine getting dusted and maybe a couple damaged due to overheating, but I can't remember one where the engine broke pistons, had a bad case or had this much trouble. It makes me wonder if your customer is somehow abusing the engine or not keeping the oil level up.