Canned Gasoline?

[dfkrug]

i run higher ratios and do not have heavy buildup on my exhaust port. Most of what you talk about it the older two stroke and conventional oil two strokes not the good synthetics. Good synthetic oil used even at ratios of 32:1 or 40:1 in place of 50:1 will actually start to remove and reduce some of those deposits. not all but some.

Mostly I see it in pro saws, like the Husky 266 I just opened up. These are run a lot more than most of our saws,
using 50:1 conventional JASO-FD semi-synthetic oil. Owners manuals of some pro saws do mention that chainsaws
need their exhaust ports and mufflers cleaned as scheduled maintenance.

In the 2-stroke racing world, 32:1 full synth is often used, but tear-down and de-carboning is called for very
often. Power valves can clog up with this oily soot, which is actually abrasive. I often see the first scoring on
chainsaw pistons occur right next to the exh port where the soot "stalagmites" grow.

 

[clemsonfor]

Mostly I see it in pro saws, like the Husky 266 I just opened up. These are run a lot more than most of our saws,
using 50:1 conventional JASO-FD semi-synthetic oil. Owners manuals of some pro saws do mention that chainsaws
need their exhaust ports and mufflers cleaned as scheduled maintenance.

In the 2-stroke racing world, 32:1 full synth is often used, but tear-down and de-carboning is called for very
often. Power valves can clog up with this oily soot, which is actually abrasive. I often see the first scoring on
chainsaw pistons occur right next to the exh port where the soot "stalagmites" grow.

They scratch on the exhaust side as that is the hot side and there is less oil on that side bacause that is the far end from where the charge ends. but i would agree if there is that much carbon on a saw that too can serve as a source for scratches.

I do have to wonder about what oil these "pro saws" are being mixed with? and the tune of them? I have at least 3 saws that i got off loggers. Real loggers that use them daily. Two of the saw i was into as they both had issues. I took 2 and made 1. they were both husky 372 and were from different loggers. Neither one was carboned up. They both had their issues but carbon was not one of them.

 

[clemsonfor]

Mostly I see it in pro saws, like the Husky 266 I just opened up. These are run a lot more than most of our saws,
using 50:1 conventional JASO-FD semi-synthetic oil. Owners manuals of some pro saws do mention that chainsaws
need their exhaust ports and mufflers cleaned as scheduled maintenance.

In the 2-stroke racing world, 32:1 full synth is often used, but tear-down and de-carboning is called for very
often. Power valves can clog up with this oily soot, which is actually abrasive. I often see the first scoring on
chainsaw pistons occur right next to the exh port where the soot "stalagmites" grow.

They scratch on the exhaust side as that is the hot side and there is less oil on that side bacause that is the far end from where the charge ends. but i would agree if there is that much carbon on a saw that too can serve as a source for scratches.

I do have to wonder about what oil these "pro saws" are being mixed with? and the tune of them? I have at least 3 saws that i got off loggers. Real loggers that use them daily. Two of the saw i was into as they both had issues. I took 2 and made 1. they were both husky 372 and were from different loggers. Neither one was carboned up. They both had their issues but carbon was not one of them.

 

[Diamondpilot]

My blower has set since about November with E0 regular mixed gas. I needed it today and it fired right up. My weed whacker has sat longer than that. I started it just to see if it would and it fired right up. What would the canned fuel have helped? <img src="http://www.tractorbynet.com/forums/attachment.php?attachmentid=455278"/>

You don't listen do you? E0 is nice but it's not available in my state. I can't even get it anymore at my marina. I don't buy canned fuel, I use aviation fuel. If I could get E0 like you I wouldn't have problems either.


Consider yourself lucky.

Chris

 

[dfkrug]

I do have to wonder about what oil these "pro saws" are being mixed with? and the tune of them?

Pretty much every pro chainsaw user I meet uses 50:1 mix, using the latest semi-synth, like the stuff you
buy at the big box stores, labeled "Echo", "Ryobi", "Craftsman", or "Husky". Few use the expensive
Stihl pre-mixed fuel. None who I have met so far.

2-strokes are a compromise: they have to burn oil, or pass it thru the engine to lube things up. This
unavoidably leaves deposits on the piston, in the cyl top, on the exh port, and in the muffler. The
more oil in the mix, the more deposits you get. Also, the more hours on the unit, the more deposits you get.
Pro users may run gallons of fuel in one day of work.

After a certain amount of hours, you will have to de-carbon the above. It is just going to be sooner if
you add more oil than the proven 50:1 ratio.

 

[clemsonfor]

Pretty much every pro chainsaw user I meet uses 50:1 mix, using the latest semi-synth, like the stuff you
buy at the big box stores, labeled "Echo", "Ryobi", "Craftsman", or "Husky". Few use the expensive
Stihl pre-mixed fuel. None who I have met so far.

2-strokes are a compromise: they have to burn oil, or pass it thru the engine to lube things up. This
unavoidably leaves deposits on the piston, in the cyl top, on the exh port, and in the muffler. The
more oil in the mix, the more deposits you get. Also, the more hours on the unit, the more deposits you get.
Pro users may run gallons of fuel in one day of work.

After a certain amount of hours, you will have to de-carbon the above. It is just going to be sooner if
you add more oil than the proven 50:1 ratio.

I would agree with this statements.

The saws i got from loggers were husky 372s and from two different ones. Neither had much in the deposit department in them. One was scratched and the exhaust side of the piston was wearing away and had welded a ring in the groove so they were probably tunded to lean. The other looked perfect. My bet and from what i remember seeing is that they both use XP (semi syn) oil they get at the saw shop in the same town and mix it 5 gallons a time.

 

[dfkrug]

One was scratched and the exhaust side of the piston was wearing away and had
welded a ring in the groove so they were probably tunded to lean.

At least you can hope that most pro users will not kill a saw from failing to add the pre-mix oil to the gas.
That has got to be the #1 failure mode for 2-strokes in general, usually made by the occasional user.

I also see carbon-buildup scratching, as mentioned above, plus air filtration failure, plus lean-mix
failure. Lean-mix failure prob is caused as much by air leaks in the intake boot or crank seals
as improper tuning, and the results are the same.

 

[dfkrug]

One was scratched and the exhaust side of the piston was wearing away and had
welded a ring in the groove so they were probably tunded to lean.

At least you can hope that most pro users will not kill a saw from failing to add the pre-mix oil to the gas.
That has got to be the #1 failure mode for 2-strokes in general, usually made by the occasional user.

I also see carbon-buildup scratching, as mentioned above, plus air filtration failure, plus lean-mix
failure. Lean-mix failure prob is caused as much by air leaks in the intake boot or crank seals
as improper tuning, and the results are the same.

 

[clemsonfor]

your right about the air leaks. Probably most are from an air leak. And is run lean too long by someone who is ignorant or does not care.

 

[dfkrug]

your right about the air leaks. Probably most are from an air leak. And is run lean
too long by someone who is ignorant or does not care.

That certainly does happen, esp when someone who is tuning the saw sees that they can get some
more apparent power out of the saw when turning in the H screw just a bit more....

Here is a photo of an 066 exhaust port (92cc), and you can see that there are flakes of
carbon that are rough and barely holding onto the port surface. These chunks are
abrasive and get sucked into the port. You can see some scratching below the lower ring.
Certainly due for a de-carbon.