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Pol xlt running lean on pto side. I changed all

Pol xlt running lean on pto side. I changed all seal/gaskets, blew 2 pistons. wtf

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I would jet the lean side up one jet size if the sled is running extremely lean. You can also adjust the needle up if you can without having to increase jet sizes.

Posted on Feb 22, 2010


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A friend asked my to look at his bike. He blew it up and replaced piston... ran for 5 weeks and blew again. Got another piston and ring and it had NO compression . Long story short.. I ordered a NEW...

Hi,,ok that is a lot of wasted money spent,,the power valve plays little role in compression,,the FIRST thing to do is remove the flywheel and check the crank seal,,the compression has to be going somewhere,,,and the stator side crank seal is almost allways to blame(blows engines real fast,,sucks air,motor runs lean and bang!)

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I have a 2002 Arctic Cat 570 Mountain Cat with only 300 miles on it. So far, I've blown 3 pistons. My snowmobile mechanic says it's running too lean, even after he cleaned the carb and changed the jets. ...

check the crank seals. the sled has only 300 miles but it is almost 10 years old and those seals need to be wet or they dry out and cause a lean condition, therby melting down the closest piston to the seal

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Keep burning up piston on exhaust side of 066 stihl on second jug and piston i know oil mix is right running three other stihl saws on mix

It sounds like you are running lean. Not a lean oil/gas mix but a lean Air/fuel ratio. This engine runs hot as a high performance engine. any air leaks such as crank seals, manifold gaskets or muffler gaskets can give you too much air for the fuel coming in.

Secondly from the fuel side:
Ethanol (curse it) combines with oils that have no nondispersants making a white chalky poweder in the fuel system causing less fuel to mix with air. any blockage or pin hole leak can cause less fuel to be brought into the engine thus less cooling and lubricating.

Your carburetor and fuel filter need to be serviced and adjusted correctly or they will affect the mix.

When done the engine should run no faster than 13,000 rpm top no load speed.
This engine should idle smoothly at 2,500 with no more than 150 rpm change

if the speed is not as listed above when the rebuild is done you need to go back into the machine.

Call up a shop like www.arcolawn.comto get a EDT8 tach. it is well worth the money.

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1 Answer

After getiing my puma back?the engine now smokes and there no compression in number 2 piston is my engine dead?

You have this listed under 2001 Ford Focus, but say it's a Puma and also reference the #2 piston. Based on that, I'm going to assume you mean an Arctic Cat Puma snowmobile. If so, Pop the head off (4 nuts) and if it's the gasket, you'll see where it's blown out. Get a new gasket, pop the head back on and tighten it back up. If it's the piston or rings, you'll be able to tell when you pull the head. If the piston has a hole or melted down from a lean condition, you'll see it. If the rings are shot, you may see some scoring on the cylinder wall. You might also be able to tell by the spark plug. Pull it and check for a silvery residue. If the piston burned, it will sometimes leave a silver (aluminum) film on the plug. A whiteish plug means lean which could cause the head gasket or piston problem as well. A dark (brownish, blackish) plug means it was running rich and your piston "should" be ok. Again, best bet would be to pull the head and check everything out.

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96 Xlt Polaris Blew two pistons on pto side

I would richen the sled up one or two jet sizes.

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My polaris Predator 500 2005. it blew a rubber valve cover gasket looking thing.OIL literaly blew 15ft and sprayed EVERYTHING in my garage. wondering what could have caused this before i tear it down....

if its a valve cover gasket that blew like that you could have major problems

Could be that it leaned aout and burnt up a cylnder or a piston, and you have major blow by now.

Btw, I’m available to help over the phone in case u need at

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Bank 1 & 2 running lean

The lean condition is caused from the upper intake gaskets and isolation bolts not sealing properly due to time and poor sealing qualities from the factory ther was a service bulliten for this through ford to replace the gaskets,bolts,vaccum line,and lh side valve cover for this concern the oil was getting onto the rubber contaminating it causing a vaccum leak. If you never had the tsb done i would start there, also if there is high milleage on the vehicle i would also clean the maf sensor and resedt kam.

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