2011 Pro Engine with 2500 miles...PERFECT!!

[modsledr]

Since most of the engine threads are negative...thought I would report on a 2011 engine teardown I witnessed last night.

This engine had 2500 miles on it. Oiler was NOT turned up. Oil was NEVER added to the tank (I'm NOT advocating either turning up or NOT turning up the oiler, and adding or NOT adding oil, I'm just reporting what was done to THIS particular sled).

The pistons looked like they we barely broken in. They still had areas of the stock coating on the skirts, and not a single scuff line...NOT ONE!!

The Cylinders still showed cross-hatching, had NO scuff marks, and just like the pistons, looked barely broken in.

I didn't see it measured, but was told that the crank runnout was checked before dis-assembly, and was only at .001-.002, pretty much spec for a NEW crank.

Cheers!!

 

[AKSNOWRIDER]

nice to hear...

 

[icerider600]

Makes me happy about my 2012 with 900 miles on it!! Thanks

 

[idahosledhead]

That makes me feel much better about the 2011 I purchased with 700 miles on it.

 

[1Mike900]

What oil was used, Polaris or other? Did engine ever run warm or basically at proper temp all the time? I assumed properly warmed up? Mike

 

[R44guy]

Nice positive thread and this is what we need more of here on this forum in my opinion. Obviously the lack of engine wear at 2500 miles may be some signs that the clearance issues have improved.

 

[modsledr]

Sorry, don't have any details about how it was ridden or cared for (this sled was purchased from the original owner)...but judging by the condition, the owner took care of the sled with proper warm up and good quality oil (the oil in the tank looked like VES Gold...but no way to know for sure).

 

[Kestrel2126]

Good to Hear! I can report similar results on mine as well. '11 with around 2500 miles. First 400 were stock, remainder has been with a BD Turbo at around 8-12 PSI boost at avg 10K'. Cylinders were in perfect condition, pistons were in excellent shape (Rings were worn, but not flaking), and crank was in very good shape as well, other than a rod pin starting to wear on one crank wheel. This probably would have caused a failure shortly, had I not found, but I would say given the boost, riding style and conditions, the motor was in extremely good shape. I am a big proponent of preventative maintenance, and I waited quite a bit longer than I normally would have, to do a complete tear down on a boosted 2 stroke.

 

[rmscustom]

Are you crazy? If you payed attention to these forums you would know that this is not possible.

 

[philsummers21]

Good to Hear! I can report similar results on mine as well. '11 with around 2500 miles. First 400 were stock, remainder has been with a BD Turbo at around 8-12 PSI boost at avg 10K'. Cylinders were in perfect condition, pistons were in excellent shape (Rings were worn, but not flaking), and crank was in very good shape as well, other than a rod pin starting to wear on one crank wheel. This probably would have caused a failure shortly, had I not found, but I would say given the boost, riding style and conditions, the motor was in extremely good shape. I am a big proponent of preventative maintenance, and I waited quite a bit longer than I normally would have, to do a complete tear down on a boosted 2 stroke.

Nice to hear. Just ordered a set of RK TEK pistons to put in for this season. Hoping to go with someones longrod crank next summer. Hopefully my crank will last another season. Believe theres about 1200 miles on this one now

 

[Clumax]

Good to Hear! I can report similar results on mine as well. '11 with around 2500 miles. First 400 were stock, remainder has been with a BD Turbo at around 8-12 PSI boost at avg 10K'. Cylinders were in perfect condition, pistons were in excellent shape (Rings were worn, but not flaking), and crank was in very good shape as well, other than a rod pin starting to wear on one crank wheel. This probably would have caused a failure shortly, had I not found, but I would say given the boost, riding style and conditions, the motor was in extremely good shape. I am a big proponent of preventative maintenance, and I waited quite a bit longer than I normally would have, to do a complete tear down on a boosted 2 stroke.

Are you saying 2100 miles at 8-12 lbs of boost? What milage is normal preventative maintenance on a turbo 2stroke?

 

[Vfrtrader]

So, why do some fail and some can go sevaral thousand miles? Is it the luck of the draw? Weak metal when forging the cylinders or pistons? Or is it the rider? WOT when climbing for 1 or 2 minutes? Running hard on poor snow days thus poor colling? What do ya think?

 

[Murph]

So, why do some fail and some can go sevaral thousand miles? Is it the luck of the draw? Weak metal when forging the cylinders or pistons? Or is it the rider? WOT when climbing for 1 or 2 minutes? Running hard on poor snow days thus poor colling? What do ya think?

Tolerance stacking,
warm up, cool down procedure
Oil usage.
Production variances
Luck???

My 2011 Pro measured a lot like the one mentioned in this thread-- my cylinders were round with only .0005" taper AFTER 2500 hard mountain miles. Our 2010-2011 season was over 500" of snow and the amount of WOT pulls while breaking trail were measured by the half hour to hour. Not minutes.

I am impressed with the condition of my motor. I full expected to see cracked cylinders, heavy scoring, flaky rings. I saw none of that.

Murph

 

[maxitout77]

1600 miles before I tore my motor down. Pistons had very minor wear on the bottom of the skirts, however everything else looked fantastic. The cylinders look like new, still lots of crosshatching. I did opt for RK Tek pistons after reading the reviews, especially since I am out of warrenty. Overall very pleased, the sky isn't falling after all.

 

[Kestrel2126]

Are you saying 2100 miles at 8-12 lbs of boost? What milage is normal preventative maintenance on a turbo 2stroke?

Yes, I have about 2100 Miles on the stock motor under boost (2500 total). For me, I will usually do a piston swap every, on a 2 stroke turbo. I was going to do it mid season last year, but I got so little riding in due to lack of snow, I decided to just push it. Then, I ended up getting more riding done late, and racked up more miles. I try to get the bottom end done about every 2000-2500 miles

 

[sledsnowco]

Maxitout77 did rk teks drop in kit get rid of the vibration the pro has? Also does it feel like added horsepower? Really interested in this kit.

 

[skibreeze]

Maxitout77 did rk teks drop in kit get rid of the vibration the pro has? Also does it feel like added horsepower? Really interested in this kit.

I just added RK TEK's pistons to my '12 and it changed the way it feels for sure. I'm halfway done rebuilding my '11 with RK's pistons in it also.

 

[RHODESIE]

kelsey's goodies

i installed a set of rk's direct replacement pistons last week in an '11 and the decline in vibration is "extremely noticable". The 3000 rpm death shake is all but gone. Installed his drop in kit (pistons and head) in my own '12 on saturday and way less vibration. the 3000 rpm shake also pretty much gone. this thing is crisp. Doobie rode the '11 in golden on the weekend and was much happy throttle response and quick rpm flash. looking forward to riding my '12 this season. These products are top notch!