272xp running bad, I have opinion, what’s yours?

[Duce]

Back story to saw. Neighbors son and friends cut a large circle in Higgins lake ice, around 100 foot diameter. Cut a square at it’s edge, made support for boat motor, spun ice around, built a fire in center and had a party. Dad is not too happy, I rebuild this saw about 3 years ago and he has owned since new. Saw piston is scored on both sides and intake side is worse. My thoughts are it leaned out from running such cold air, or ingested water? Held vacuum just fine. Your opinions.

 

[Stump Shot]

Check the fuel tank, straight gas will wreck a piston all the way around.

 

[Duce]

Check the fuel tank, straight gas will wreck a piston all the way around.

He had blue gas in it. Checked that first.

 

[redline4]

I've ran my stuff at -15 so unless the setting were way off I don't think cold was an issue.

Most ice saws do run a shield on the front to cut down water spray. I'd think water intrusion would cause other issues than scoring, like bent rods and hydrolocking.

I'm with Steve. Kids forgot the oil.

 

[Lions fan]

He had blue gas in it. Checked that first.

kids probably dumped out the straight gas and refilled it with mixed after she seized up.

 

[aeolian]

Scoring is located from rings and below and is more profound at the intake side.
Most probably from water or ice particle ingestion .

 

[Duce]

Scoring is located from rings and below and is more profound at the intake side.
Most probably from water or ice particle ingestion .
View attachment 374194

Think you may have nailed it. Thanks

 

[aeolian]

Think you may have nailed it. Thanks

Straight gassing the saw or a lean mixture will have had the piston scored at the exhaust port side .
But at the current failure water droplets ( fine mist ) was ingested from the air filter all the way to the low engine part ,where it "pushed" the oil film away from the piston skirt.
Thus the damage is mainly done
from the piston rings and below
( water droplets entering the low part of engine ) and located at the intake side of the piston .

It had to be so major the water ingestion ,that water vapors washed off a bit of oil at the exhaust side of piston skirt,
as they were expelled out of the chamber.

Those kids really must 've had quite some fun with that saw ,cutting lots of frozen water.

 

[cus_deluxe]

now is also a good time to check that the intake block is not cracked, if it hasnt been replaced previously.

 

[nixon]

He had blue gas in it. Checked that first.

Empty the carb metering chamber onto a paper towel . You’ll know if the fuel was mix ,or not. Not saying it happened, but it wouldn’t be the first time straight gas was replaced with mix to save being “embarrassed “ .

 

[Duce]

now is also a good time to check that the intake block is not cracked, if it hasnt been replaced previously.

I do not see any cracks, then again just had cataract surgery. Will look again, thanks.

 

[Stump Shot]

I do not see any cracks, then again just had cataract surgery. Will look again, thanks.

Hope that went well for you, they must have been out of Lincolns?

 

[Duce]

Hope that went well for you, they must have been out of Lincolns?

Everything went well, surgeon knows his stuff. Thanks

 

[Stump Shot]

Straight gassing the saw or a lean mixture will have had the piston scored at the exhaust port side .
But at the current failure water droplets ( fine mist ) was ingested from the air filter all the way to the low engine part ,where it "pushed" the oil film away from the piston skirt.
Thus the damage is mainly done
from the piston rings and below
( water droplets entering the low part of engine ) and located at the intake side of the piston .

It had to be so major the water ingestion ,that water vapors washed off a bit of oil at the exhaust side of piston skirt,
as they were expelled out of the chamber.

Those kids really must 've had quite some fun with that saw ,cutting lots of frozen water.

While this is an interesting condition, having water damage is not seen very often.
A saw ran without oil will indeed ruin the entirety of the piston, which is much more common event to occur and by checking the fuel in the tank, will confirm or deny what happened, in this case it denied that as a possibility and lead to a different conclusion.

 

[aeolian]

While this is an interesting condition, having water damage is not seen very often.
A saw ran without oil will indeed ruin the entirety of the piston, which is much more common event to occur and by checking the fuel in the tank, will confirm or deny what happened, in this case it denied that as a possibility and lead to a different conclusion.

Yes ,it is a damage not seen very often .
But then again not so many folks cut wood when raining cats and dogs and even fewer attempt to cut with an ordinary chainsaw the top ice layer of a frozen lake or a frozen river or even a frozen fjord .

If water finds it's way into the lower part of a small 2-stroke engine ,the possibility of such damage is actually quite high .Not seen often ,
cause is not usual at all for water to enter the engine.

Personally ,I'm 99% sure that this is the actual cause. Young kids usually deal at one point with two stroke engines .Can't be the case that none of them was aware that the fuel needs to be mixed with oil.

Furthermore,as already I've stated the major scoring is located at the intake port side of piston skirt and far less at the exhaust port side one.
A straight gassed chainsaw will show major scoring all around the piston skirt and also above the ring(s) . Moreover,the piston itself does not show any sign of overheating ( white /foggy hue of aluminium ,due to surface oxide layer thickening ).

 

[Stump Shot]

Yes ,it is a damage not seen very often .
But then again not so many folks cut wood when raining cats and dogs and even fewer attempt to cut with an ordinary chainsaw the top ice layer of a frozen lake or a frozen river or even a frozen fjord .

If water finds it's way into the lower part of a small 2-stroke engine ,the possibility of such damage is actually quite high .Not seen often ,
cause is not usual at all for water to enter the engine.

Personally ,I'm 99% sure that this is the actual cause. Young kids usually deal at one point with two stroke engines .Can't be the case that none of them was aware that the fuel needs to be mixed with oil.

Furthermore,as already I've stated the major scoring is located at the intake port side of piston skirt and far less at the exhaust port side one.
A straight gassed chainsaw will show major scoring all around the piston skirt and also above the ring(s) . Moreover,the piston itself does not show any sign of overheating ( white /foggy hue of aluminium ,due to surface oxide layer thickening ).

I believe the assessment to be correct of water damage, all I am saying is you have to start somewhere, even if all you do is rule that starting point out and move on from there in diagnostics. The clues left behind will always tell the story no matter how fine they may be. Reminds me of Karl...

 

[Lions fan]

Yes ,it is a damage not seen very often .
But then again not so many folks cut wood when raining cats and dogs and even fewer attempt to cut with an ordinary chainsaw the top ice layer of a frozen lake or a frozen river or even a frozen fjord .

If water finds it's way into the lower part of a small 2-stroke engine ,the possibility of such damage is actually quite high .Not seen often ,
cause is not usual at all for water to enter the engine.

Personally ,I'm 99% sure that this is the actual cause. Young kids usually deal at one point with two stroke engines .Can't be the case that none of them was aware that the fuel needs to be mixed with oil.

Furthermore,as already I've stated the major scoring is located at the intake port side of piston skirt and far less at the exhaust port side one.
A straight gassed chainsaw will show major scoring all around the piston skirt and also above the ring(s) . Moreover,the piston itself does not show any sign of overheating ( white /foggy hue of aluminium ,due to surface oxide layer thickening ).

Huh? You've obviously never been to the Pacific Northwest or Upper Midwest regions of the United States.