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Personally even after 15 yrs I still can't tell when RPMs change by 50 rpm on the Echo line besides I do wear ear plugs most times to save my hearing.
Startech : many thanks for the papers you sent - with that I can do the adjustment of the L-screw and I know the basic for the "H"-screw. It is a pity that there is not much said or written about the "H"screw that for me is the most important adjustion that is to make on my machines. Then only write : turn H-screw 2.1/2 turns out and that is it...It takes years to be able to tune handheld 2-stroke equipment efficiently and effectively by ear and using a tachometer. Not something you can read and just turn a screw. Some are easier than others.
My 2 machines "R" and "T" are both identical - they both run great but the "R" runs richer then the "T", although both have the same "turning out of the H-screw", namely both 2.1/8" out. They should do the same, both they don't.IF doing try this be aware the air filter cover setup maybe different as two different setups was used on these hedgers depending on which choke lever was used.
I do not understand this StarTech. Normally they set the H at 2.1/2 turns out. The Brazilian 82R is set at 2 turns out to run them rich. But 2 turns out is leaner then 2 1/2 turns out, isn't it? I thougt that screwing in (clockwise) makes the mixture leaner - mine sits now at 2.1/8 turn in instead of 2.5 turns in - so mine is now set leaner than the standard? Please conform because now i am getting a little confused.There is a note in the service manual about the Brazilian 82R being set at 2 turns. They run these rich is to keep them cooler as they can overheat if too lean. Especially they are tuned for high altitude and then used at sea level.
These service manual setting are probably for sea level to 2500 ft.
Also if you are at higher altitude a leaner mixture would be needed.
I usually tune to basic settings for most Stihl with limiters and finally touch up the H to where the limiter just start kicking in. This way it is still on the rich side but not excessively rich. This is because L setting does affect the H setting but H does not affect L setting.
Startech, are you shure? So 2.1/2 turns out is leaner then 2.1/8 turns out? I thought that screwing tem IN (counterwhise) would make the mixture with less fuel - so leaner.Yes turning the screws CW does lean out the mixture. Just the nature RH threaded screws.
As for why the Brazilian units are tuned differently I don't know unless they changed the mixture screws somehow or it is some government reg.