Poos Problems

[lenny]

?? Thats what I said. "The failures we're talking about here are NOT friction issues.

The picture of your piston is a clasic example of a lean burn down. The piston crown became so hot it melted on the exaust port side. Once again, nothing to do with lack of oil.

if the pistons are not consistent in the correct size and indeed the piston skirts are scoring the cylinders, you will have tremendous friction and the rings can become stuck in the piston and loose compression. We tore Boondockers82's motor apart in my garage and that is exactly what happened. Rings stuck to the piston and loss of compression, cylinders scored, pistons shot with debris all over the plug and other places. His symptom was a lower idle and reverse not working and than it just went blewy. Nick is an extremely talented rider and aggressive motor just couldn't hold up,,it was an 09 assult

 

[thebreeze]

Anyone try ordering a Polaris 800 piston second half of this season? I am trying to figure out why they were back ordered.

 

[snoluver1]

The only point I'm trying to make is that if you have a motor that is machined with incorect tolerances, you can submerge the whole flipping motor in a barrel of oil if you want. Its not going to save it!

 

[lenny]

The only point I'm trying to make is that if you have a motor that is machined with incorect tolerances, you can submerge the whole flipping motor in a barrel of oil if you want. Its not going to save it!

100% correct, now if by odds the guy who has a sled that is close and rides not so aggressive a little oil can help as long as tolerances are close to spec. If they are way off you will have a problem no matter what much sooner

are the cylinders on the 800 nikasil? probably a tolerance of .0015-.002 is acceptable at least on the old dirt bikes it was, not sure. Would love to see if we can dig deeper and see what people are measuring

 

[Boondocker82]

OK, I guess it's about time I chime in. Adding oil to the gas is without a doubt going to help. Prevent? Probably not. The failure is caused by the piston clearance in the cylinder being loose and allowing the pistons to rock in the cylinder bore. With that rock or “piston slap” the pistons scrape the cylinder wall and remove the oil film from the cylinder wall. So with more oil the film will be thicker and take longer to remove. As the pistons continue to scrape they begin to cause damage to the pistons, rings, and the cylinder. “Piston slap” also causes the pistons to develop a knifed edge and the piston skirts/cylinder skirts to fatigue. As this happens the engine will begin to loose compression and having “bog” issues, and as it worsens it will begin to idle poorly and not switch into reverse. I decided to go with the MTNTK "Fix Kit" this year and it ROCKS! The sled has never ran so good or had near the power it does now. I had $1100 into the parts when it was all said and done and the piece of mind that came with it was and is priceless. I should add this was my 3rd top end in 1700 miles. Any one thinking of doing the fix or RKT pistons, make damn sure you get a new monoblock from US chrome no matter how good of shape you think yours is in. The chance of your cylinder being cracked is super high and you cant tell by just visually inspecting it. Putting a set of pistons in and using your old block is just downright STUPID! The old pistons have been slapping around in there for god knows how long and you dont think there's damage to your cylinder? As for buying a PRO, **** yeah I'd buy one. Wouldnt even think twice about it. I'd also tear it down as soon as I got it home and put one of the known "fix" kits in it. I personally believe they are all good products and it just boils down to what appeals to you. If your looking to do a pipe, can, head, ect. go with the MTNTK Fix kit. or the RKT "Drop in pistons" they both keep the sled stock as far as port timing, mapping, ect. So the pipes/cans, heads and any other performance upgrade act the same as they would on a stocker. If you want to get 18+ horse and never do anything more due to lack of R&D then go with the RKT piston/head kit. It changes port timing, runs higher RPM, and has no other upgrades available. I have heard that the SLP pipe is working great on the piston/head kit with the SLP stage 4 map. OK, I'm outta breath. Hope this helped anyone who's on the fence about purchasing a Poo 800.

 

[Boondocker82]

100% correct, now if by odds the guy who has a sled that is close and rides not so aggressive a little oil can help as long as tolerances are close to spec. If they are way off you will have a problem no matter what much sooner

are the cylinders on the 800 nikasil? probably a tolerance of .0015-.002 is acceptable at least on the old dirt bikes it was, not sure. Would love to see if we can dig deeper and see what people are measuring

yes, they are nikasiled. Clearance on the Wiseco's which came with the MTNTK kit were between 0.0049" and 0.0051". Minimum is 0.004" from PMS install sheet. The OEM used pistons were 0.009".
BTW: I hope Polarisrider1 can ride cause I think he may be going on an adventure with us next season, we like to show your kind how we ride. Hope you dont eat your words buddy. aww heck, I'm just kidding, I hope you get absolutely burried

 

[polarisrider1]

yes, they are nikasiled. Clearance on the Wiseco's which came with the MTNTK kit were between 0.0049" and 0.0051". Minimum is 0.004" from PMS install sheet. The OEM used pistons were 0.009".
BTW: I hope Polarisrider1 can ride cause I think he may be going on an adventure with us next season, we like to show your kind how we ride. Hope you dont eat your words buddy. aww heck, I'm just kidding, I hope you get absolutely burried

LOL, Ladies I suspect you was still sucking mommas milk when I started riding. I can hold my own. I have ridden with many posers and suspect you fit that group. Poo Envy runs deep. And my sled runs fine!

 

[lenny]

yes, they are nikasiled. Clearance on the Wiseco's which came with the MTNTK kit were between 0.0049" and 0.0051". Minimum is 0.004" from PMS install sheet. The OEM used pistons were 0.009".

BTW: I hope Polarisrider1 can ride cause I think he may be going on an adventure with us next season, we like to show your kind how we ride. Hope you dont eat your words buddy. aww heck, I'm just kidding, I hope you get absolutely burried

Nick's a funny guy but he knows his sheet (spec sheet that it.) TAKE IT EASY ON THE OLD BOY (lilwayne), he's pushin 60. Wayne is a good guy and I'd love to ride with him. Maybe he can show us up?

Here is a typical ride with Bob, Nick, Flat Top and I. I say to Nick "I bet you cannot make that line" and before I finish my sentence he's reachin for his helmet. I tell Bob "Nick's gonna out do you" and there goes Bob! I believe Bob's new nickname is gonna be "no way Bob" because after his run we all stare in disbelief and say to ourselves "no way" BUT him and his sled say's "yes way."

DHealy is another serious ride along with MGunthrie. We need to get these guys out west with us next time

 

[pwolfy2003]

Glad I dont haveto worry about Poos anymore, except my wifes and sons for now. Polarisrider1 I was one of the most loyal Poo riders there is with 23 new sleds in 21 years , but since 2010, 6 motors have gone down on us. The only ones with more than 2500 miles was my 2013 ,800 (4880 Miles) and my 2011 LX 750 4 stroke (6800 Miles) so to get kicked in the teeth anymore is not gonna happen. If they cant own up to having a problem and getting it fixed then its time to tell them to KMA, and I did.If you can honestly say they are reliable then keep buying cuz I wont. I was also very unhappy when going to dealers and trying to get rid of my 2013 and they almost laughed at me . Found a dealer that heard all of my issues,and they gave me an awesome price to trade on a Yami,couldnt get it off the trailer fast enough.

 

[Dave_B]

You won't have to show him anything. He's an old man but, he can ride.

If you want out ride him, feed him Fireball first!

 

[lenny]

LOL, Ladies I suspect you was still sucking mommas milk when I started riding. I can hold my own. I have ridden with many posers and suspect you fit that group. Poo Envy runs deep. And my sled runs fine!

Wayne, seriously! I'd change those pistons and do what needs to be done because your right on the edge and it's gonna puke soon, maybe not if you keep riding it like my gramma

 

[polarisrider1]

a loyalists will defend Poo at any cost but it still doesn't make it right. You machine is going to blow my friend and there is nothing you can do to prevent it if you continue to run the crap stock pistons. No need to be defensive. You have a excellent machine but with a poorly engineered engine. if you are willing to wrench than you have the best and that is good. I may be buying one myself.

I'd be willing to bet I can go any place on my Mtn max and even further than you can go,,,

Gotta love you Lenny, It's a deal but I need to get you out west and not the bunny hills. I may be on borrowed time with the motor and time will tell. RevKev has had no motor issues with his 2011 and has double the miles on his then I do. I am not denying Poo had issues with many of their motors and I may be just lucky. Last trip out to Lava was my end of season ride. Tried to blow the motor up by riding it for all it was worth, no luck, had about a dozen JDee'rs with on that trip. If and when it blows I most deffinately will be screaming the loudest and will let the world know. P.s. sled is bone stock except for the "muff pot"

 

[lenny]

yes, they are nikasiled. Clearance on the Wiseco's which came with the MTNTK kit were between 0.0049" and 0.0051". Minimum is 0.004" from PMS install sheet. The OEM used pistons were 0.009".
BTW: I hope Polarisrider1 can ride cause I think he may be going on an adventure with us next season, we like to show your kind how we ride. Hope you dont eat your words buddy. aww heck, I'm just kidding, I hope you get absolutely burried

seem's sloppy to me

 

[polarisrider1]

You won't have to show him anything. He's an old man but, he can ride.

If you want out ride him, feed him Fireball first!

Thanks Dave 53 is old isn't it.

 

[lenny]

Gotta love you Lenny, It's a deal but I need to get you out west and not the bunny hills. I may be on borrowed time with the motor and time will tell. RevKev has had no motor issues with his 2011 and has double the miles on his then I do. I am not denying Poo had issues with many of their motors and I may be just lucky. Last trip out to Lava was my end of season ride. Tried to blow the motor up by riding it for all it was worth, no luck, had about a dozen JDee'rs with on that trip. If and when it blows I most deffinately will be screaming the loudest and will let the world know. P.s. sled is bone stock except for the "muff pot"

you da man wayne, all in good fun and your a good sport. Seriously, I'd love to do some riding with you regardless of your inferior skills!

 

[indy_500]

Glad I dont haveto worry about Poos anymore, except my wifes and sons for now. Polarisrider1 I was one of the most loyal Poo riders there is with 23 new sleds in 21 years , but since 2010, 6 motors have gone down on us. The only ones with more than 2500 miles was my 2013 ,800 (4880 Miles) and my 2011 LX 750 4 stroke (6800 Miles) so to get kicked in the teeth anymore is not gonna happen. If they cant own up to having a problem and getting it fixed then its time to tell them to KMA, and I did.If you can honestly say they are reliable then keep buying cuz I wont. I was also very unhappy when going to dealers and trying to get rid of my 2013 and they almost laughed at me . Found a dealer that heard all of my issues,and they gave me an awesome price to trade on a Yami,couldnt get it off the trailer fast enough.

That's fine, stock up on hyfax and bogey wheels. Oh yeah, you might need to lose 250 lbs too Kidding aside, everythings a sacrifice. You get the best ride best handling lightest weight sled with a crappy motor or a heavy darting sled that will last forever...

 

[indy_500]

Seriously, I'd love to do some riding with you regardless of your inferior skills!

x2 but da mans always in canada eh!

 

[lenny]

Gotta love you Lenny, It's a deal but I need to get you out west and not the bunny hills. I may be on borrowed time with the motor and time will tell. RevKev has had no motor issues with his 2011 and has double the miles on his then I do. I am not denying Poo had issues with many of their motors and I may be just lucky. Last trip out to Lava was my end of season ride. Tried to blow the motor up by riding it for all it was worth, no luck, had about a dozen JDee'rs with on that trip. If and when it blows I most deffinately will be screaming the loudest and will let the world know. P.s. sled is bone stock except for the "muff pot"

Man, every ride out west was riding it for all it was worth, there was no babying the sled. I go out there to take it to a new level and this year will be no exception. In all honesty I am an decent rider but not overly skilled but no doubt learning and am majorly stoked just thinking about riding. There is some seriously technical riding here in da UP you are welcome to come up and ride in out little posse any time.

Just bring your tampons, shovel and blanket,,and a lighter,,,lol

 

[pwolfy2003]

Indy ,Im not worried about the weight at all,what good is a sled thats good handling and lightweight if its in the shop with motor issues? Im a trail rider and dont care if its heavier,. as long as it keeps going and going until the snow is gone and not til motor is gone.

 

[polarisrider1]

Man, every ride out west was riding it for all it was worth, there was no babying the sled. I go out there to take it to a new level and this year will be no exception. In all honesty I am an decent rider but not overly skilled but no doubt learning and am majorly stoked just thinking about riding. There is some seriously technical riding here in da UP you are welcome to come up and ride in out little posse any time.

Just bring your tampons, shovel and blanket,,and a lighter,,,lol

no tampons, that would be Olaf.