Two stroke oil that leaves NO carbon? ?

[Jiles]

I bought a well used Makita concrete saw. I tore completely down and noticed there was no signs of carbon build up in combustion chamber or piston top.
Also, the exhaust port was clean and the muffler was carbon free and had a RED TINT color to inside.
Piston ring gap was .015.
I have no way of contacting PO but would like to know if anyone else has had this experience.
I will try to post photos later.

 

[old guy]

I think carbon is the result of running too rich, there is no carbon in my saws.

 

[Jiles]

I think carbon is the result of running too rich, there is no carbon in my saws.

In over fifty years of working on 2 strokes, I have never encountered a carbon free engine.
What brand oil do you use?

 

[CR888]

Carbon is normal in a 2 stroke that's correctly tuned. No carbon would indicate an overly rich carb tune. So rich it washes off the piston crown. 2 strokes combust oil for a livin every second their run.

 

[old guy]

O P said carbon build up, I never have screens clog or thick deposits in ex. ports or mufflers. I have used any old dead cat fer oil but lately have gone to Lucas.

 

[T.Roller]

As said before no carbon at all indicates too rich of a tune

 

[old guy]

346s turning 14600 to 15000, 357s at 14000, 365 at 14400, 372 at 14000, nah, these ain't rich

 

[bikemike]

I think carbon is the result of running too rich, there is no carbon in my saws.

I agree any engine 2 or 4 stroke will carbon up with too much fuel. Yeah some oils WilL contribute but too much fuel equals soot

 

[bikemike]

I also believe that a choked up exhaust system can contribute to carbon build up, same with rev limiters

 

[backhoelover]

i use deep creep to remove carbon from units. alot of idle time will cause a unit to carbon up

 

[mdavlee]

346s turning 14600 to 15000, 357s at 14000, 365 at 14400, 372 at 14000, nah, these ain't rich

That's borderline rich with wet piston tops in my own saws. 16k or so will net a dry piston top in a 346 and 372. 460s as well.

 

[huskyboy]

I bought a well used Makita concrete saw. I tore completely down and noticed there was no signs of carbon build up in combustion chamber or piston top.
Also, the exhaust port was clean and the muffler was carbon free and had a RED TINT color to inside.
Piston ring gap was .015.
I have no way of contacting PO but would like to know if anyone else has had this experience.
I will try to post photos later.

Sounds like red armor

 

[Jiles]

Sounds like red armor

Here are a few photos---

 

[Jiles]

View attachment 70865 View attachment 70866 View attachment 70867 View attachment 70872 View attachment 70874
Here are a few photos---

One more Photo--
I might add that this is the way parts looked at teardown, no cleaning was done.

 

[Deets066]

I ran motul 800 for a while and that didn't seem to leave any wash or trace of carbon. To me that means an incomplete burn. Some of those bike oils are hard to get a good burn out of em in these little saw engines.

 

[Deets066]

I ran motul 800 for a while and that didn't seem to leave any wash or trace of carbon. To me that means an incomplete burn. Some of those bike oils are hard to get a good burn out of em in these little saw engines.

It just happens to be red in color also

 

[old guy]

That's pretty dry ok, I don't have anything that looks like that. My ex. ports & muffelers have a black or brown color,but it never builds up or gets thick & oily. Piston tops have a pattern of thin black soot.

 

[old guy]

That piston top looks like it was just put in & the saw started once.

 

[Jiles]

My thoughts also.
Just so everyone knows, I have no idea of saw history.
I checked echo red armor oil and saw where it had detergent additive to remove carbon?
First I ever heard of that.
The saw was very dirty and appeared to have been run a lot. Also showed no signs of ever being torn down.

That piston top looks like it was just put in & the saw started once.

 

[huskyboy]

Not to turn this into a oil thread but I've never had a problem with husqvarna xp, husqvarna low smoke, echo powerblend oil or red armor at 40:1. Never left huge amounts of carbon, left nice film inside and are easy to get. They also dye the gas nicely so you can take a look and see that it is mixed and not straight gas.