This may be of interest to some of you, i have a Stihl KM130 combi that gets used for grass cutting/trimming, hedge cutting and also a little path clearing with blower attachment.
It's over 1yr old now and usually only sees light use.
Anyway, after the first couple of tanks of mix using regular Stihl hp oil, i made the decision to switch to Amsoil Saber Pro and mix it at 50/1 ratio.
I lost count how many tanks of Amsoil mix it has had, but i would guess about 10 or so tanks mixed with Shell high octane but also some regular octane shell too.
Well, after reading this excellent thread, i decided to remove the plug and take a look at the piston crown with a flashlight, and to my total amazement the piston crown is totally clean of any carbon deposits that i can see.
Looking at it through the spark plug hole, it looks just like a new piston that has never been run. Weird.
The plug is not so clean, with some deposits but nothing out of the ordinary and has a good color.
What baffles me more is that i trimmed the limiter stop on the high speed jet about the middle of last year and backed it out another 1/8th of a turn to make it run a little richer/cooler. After doing this, i always had doubts as to how clean it would stay inside.
I don't know what the valves and seats look like, but fingers crossed, i hope they look like that piston crown.
Edit: Forgot to mention, i don't need to run it at full throttle very often because it does not need full throttle, and also i hate the sound of it bouncing off the rev limiter.
opcorn:
