Pol xlt running lean on pto side. I changed all

Did you change both sensors or only one?

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!)

good luck

It realy depends on how much oil is around the piston, and in the bore, however you should be getting over 100 psi

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

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.

good luck

Joe

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.

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

piston rings gone valves gone blown gasket i need more info buddy

1 Inspect Piston Ring Set Worn or broken piston rings. 2 Inspect Valve Stem Seal Cracked or brittle valve stem seals allowing oil to enter combustion chamber. 3 Inspect Head Gasket - Performance Head gasket leaking coolant into cylinders 4 Inspect Fuel Injector Rich injector 5 Inspect PCV Valve Plugged or damaged pcv valve. 6 Inspect Engine Worn or scored cylinder block 7 Inspect Piston Worn or damaged piston. 8 Inspect Valve Guide Worn valve guides

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.