Will Mtntk Fix Kit Actually Work?

[Regan]

First time polaris rider this year, have a 13 assault 800. Replaced top end earlier this year and all was good. This was at about 1000 miles on the sled. Was on the trail coming home from our mountain trip and the it locked up again about 8 km from the truck! Needless to say I am fed up with this liberty motor and I am going to put the fix kit on it this time. Will it solve my problem? Has anyone else put it on their engines and has it worked? Waiting for parts and really frustrated with these motors. No warranty on the sled either, really considering riding a different sled. Any info would be great.

 

[TKrebs]

Dealers seem to swear by them.

 

[cdnredneck_t3]

Here are some questions for you. What happened the first time the engine went? How many miles since the re-build? Same cylinder? Did it lean out, ring pick up or spin and get caught in a port......? Did your oil pump cable come off?

If you have a problem with something and you keep throwing pistons and cylinders at it you are going cost yourself all sorts of money.

 

[Regan]

Both times it was the mag side that went, the pistons both indicated a lean condition and overheating. I have checked all that i can, thinking that maybe i have a air leak,(cracked boot, reed cage, air box not on right, ect.) I am going to turn up the adjustment to get more oil delivered to the engine. Appears oil cable is good. Word is Polaris has them running as lean as possible to meet emissions standards. It was about 300 miles since the first time it seized up, super cold day, warmed up the sled to 130 and started out slow, maybe a cold seize happened, if that is possible. I was very careful with the rebuild and sure all was assembled properly. So called experts in my area also say that these engines like to be rode hard, and many guys are popping pistons riding down trails at 6-6500 rpm which in my mind is a load of ?&%!. Kinda stating the obvious but reliability is a huge issue. Bad motor combined with bad luck? The warranty offered by Ski Doo is looking pretty good!

 

[cdnredneck_t3]

The fix kit is to solve the problem of the piston skirt deforming and increasing the clearance between it and the cylinder wall. This causes the piston to "slap" when going past bottom or top dead center, the piston eventually fatigues and the skirt breaks off of the piston or cylinder.

 

[007sevens]

Both times it was the mag side that went, the pistons both indicated a lean condition and overheating. I have checked all that i can, thinking that maybe i have a air leak,(cracked boot, reed cage, air box not on right, ect.) I am going to turn up the adjustment to get more oil delivered to the engine. Appears oil cable is good. Word is Polaris has them running as lean as possible to meet emissions standards. It was about 300 miles since the first time it seized up, super cold day, warmed up the sled to 130 and started out slow, maybe a cold seize happened, if that is possible. I was very careful with the rebuild and sure all was assembled properly. So called experts in my area also say that these engines like to be rode hard, and many guys are popping pistons riding down trails at 6-6500 rpm which in my mind is a load of ?&%!. Kinda stating the obvious but reliability is a huge issue. Bad motor combined with bad luck? The warranty offered by Ski Doo is looking pretty good!

I think you have some issues but I don't think its the engine. I have witnessed my sled and other sleds in excess of 1500-2500 miles on the same pistons. Keep in mind this a 2013. 2011 and 2012 are a different story. You say you warmed up to 130. This is not possible at an idle. If you drive it to 130 and start to rip on it before the thermostat opens you will cold seize the engine which is what I think you did. More so with a new engine. I haven't seen guys poping pistons on the trails since the days of 2008-2010. The mtnk fix kit will work and does work, but if your having problems now it wont fix your problems. You either have a mechanical issue or a rider issue.

 

[andrew3399]

Why do you not still have warranty? Most polaris are sold with 2 year unless the customer wants to save 300 dollars and take 1 year! You could always shell out more money and buy extra warranty. Would be the same price as a skidooo then!! Lol

 

[dragonweld28]

My cousin had his pro blow up right before the truck as well. He had 1800 miles on his 2011 pro. He put in the fix kit and turned up his oil pump. He also runs a bit of oil in the gas tank for added lubrication. He now has 4100 miles on the sled it still runs great!! You will be very happy with the extra power and how much smoother the motor runs with the lighter pistons. Its money well spent for sure. Talk to Chris at Parkland motorsports, he supplies the kits!!

 

[Bootilley]

How much oil should you be putting in a full tank of fuel just to avoid engine troubles?

 

[geo]

MNTKT pistons weigh exactly the same as stock. The kit has been around the longest so I think there would be a bunch of POS threads about them if they didn't work well.

 

[Vance Matheson]

First time polaris rider this year, have a 13 assault 800. Replaced top end earlier this year and all was good. This was at about 1000 miles on the sled. Was on the trail coming home from our mountain trip and the it locked up again about 8 km from the truck! Needless to say I am fed up with this liberty motor and I am going to put the fix kit on it this time. Will it solve my problem? Has anyone else put it on their engines and has it worked? Waiting for parts and really frustrated with these motors. No warranty on the sled either, really considering riding a different sled. Any info would be great.

i have the snowX fix kit in one of our sleds and 700 miles this season and we are happy with it .

 

[Vance Matheson]

First time polaris rider this year, have a 13 assault 800. Replaced top end earlier this year and all was good. This was at about 1000 miles on the sled. Was on the trail coming home from our mountain trip and the it locked up again about 8 km from the truck! Needless to say I am fed up with this liberty motor and I am going to put the fix kit on it this time. Will it solve my problem? Has anyone else put it on their engines and has it worked? Waiting for parts and really frustrated with these motors. No warranty on the sled either, really considering riding a different sled. Any info would be great.

oh and instead of adding oil to your gas tank just adjust the oil pump. and make sure to have spare plugs as usual.
we fouled one set early in the season still on the same plugs since.

 

[rmscustom]

None of the fix kits fix the problem your having. If you have a problem creating a lean condition they are all gonna burn down.

 

[dragonweld28]

MNTKT pistons weigh exactly the same as stock. The kit has been around the longest so I think there would be a bunch of POS threads about them if they didn't work well.

The kit includes a forged wiseco piston that is 28 grams lighter than the stock cast piston!!

 

[geo]

Not mine. Put pin , clips, ring, piston together and same weight as stock. `13 kit this fall.

I liked that because my sled is very smooth since new.

 

[Vipertonytro]

Maybe its only my theory but I have never agreed with adding oil to the fuel tank. Your injectors fire based pulse width. Voltage applied and duration of being opened according to many input factors. Based on the viscosity of a known number. (the gasoline) By adding oil you are essentially raising the viscosity of the fluid moving through the injector. In essence leaning out your engine. Lubrication doesn't fix the problem of running lean!!

My second theory on these sleds is how hot you can get them in a hurry if you don't run scratchers… I have seen many of the Polaris's run hot on the same trail as the others are running with no issues. I think Polaris could afford to add a pound or two with better coolers and another 1/2 litre of Coolant.
I have even had days with my Pro where the snow up top is hard and had it overheat just pounding around looking for unridden snow to ride in.To me scratchers are for icy hard trails but I have witnessed many times the continuous need to run them on a Pro.

Again only my theories and I'm not an engineer but its something most people don't consider.

 

[Staple_STI]

I run my scratchers a lot.. likely a lot when not required even, but **** a 40 dollar scratcher is a lot better than an over-heated engine.

I have never had my sled higher than 140 deg F on the trail even, maybe I get lucky but if I ever see it getting high in the 130s I stop, add snow, let it cool and continue.

Heat does terrible things to engines and it is worth my extra few minutes on the trail to keep the sled running

 

[Heimie]

You say you warmed up to 130. This is not possible at an idle.

Not trying to stir the pot, but yes it is. I had mine idling before a ride, just warming up like always, and started farting around in the garage. Went out to check and it was up to 140F. I took it into the loose snow to bring it down. It was about -10C outside that day.

 

[Ryan Verrecchia]

Check your fuel filter take it off and blow on it if it's hard then get a new one it's easy to check and take off.

 

[adamg]

Check your fuel filter take it off and blow on it if it's hard then get a new one it's easy to check and take off.

And it hurts to replace!