Autotune saws and fuel quality

[mdavlee]

And that's why your piston looks like this...
View attachment 481

Nothing wrong with that really. I don't have a single saw with a clean piston top.

 

[Mastermind]

I see every imaginable piston top. I've stopped looking for what looks "right".

 

[mdavlee]

I see every imaginable piston top. I've stopped looking for what looks "right".

I look at transfer wash and that's about it. The tops are going to be covered in carbon for the most part.

 

[cgraham1]

Just giving you some crap, Mike.

 

[skippy]

I use 32 to 1 belray h1r with 93 octane non ethanol pump gas

 

[mdavlee]

Just giving you some crap, Mike.

I know Clint. That's not a horrible piston top really. Seen worse with stihl ultra.

 

[cgraham1]

Did I kill another thread? Lol

 

[Mastermind]

Yes.

 

[Mastermind]

No.

 

[Mastermind]

Maybe.

 

[mdavlee]

Did I kill another thread? Lol

Nope. Just went to a gym class with the wife. Be back home to work on saws shortly.

 

[jrsdws]

Did I kill another thread? Lol

Natural Born Killer

 

[treesmith]

Ultra at 40-1 makes stuff dirty from what I've seen, piston tops, exhaust openings are really crappy. This is on stock saws at work and some of mine before I changed back to mobil when the 661 karked it

 

[skippy]

Clint didn't kill it

 

[skippy]

Well maybe lol

 

[jake wells]

you could of had this instead.

 

[treesmith]

So we're seeing dirty piston tops from oil and I'm getting the impression that it's ok, but, doesn't excess carbon turn hard and score p/c, cause a failure and generally do naughtiness to internals?

I'm confused

 

[jake wells]

my photo shows what running the wrong oil can do for you
like using a tcw3 oil in air cooled engine or vise versa.

 

[mdavlee]

So we're seeing dirty piston tops from oil and I'm getting the impression that it's ok, but, doesn't excess carbon turn hard and score p/c, cause a failure and generally do naughtiness to internals?

I'm confused

Yes. Unless the saw is so rich its washing the top you'll get some carbon. Fuel quality plays a big role as well.

 

[Joe Wrench]

The short stroke in a saw engine seems to do fine on lower octane fuel, but I've not been able to really test middle octane fuels like 93. I have tested 101, and it slowed my saws down.

Are you bringing the timing up to utilize the higher fuel grade?