aquan8tor said:
I don't know of many 2-strokes with rev-limiters with the respect of saws, trimmers, blowers, etc. When you get a 2-stroke at it's optimum mixture it will run strong and smooth. True, you can lean it out a bit for some more power but remember the oil is mixed with the fuel so when you turn the high needle in for more RPM's you also cut the oil as well so you need to ask yourself is it worth it. If you are in a situation where you need more power, step up to a larger motor.
When the atmospheric conditions change you have to remember the mixture screws don't automatically adjust....they stay right where you left them. When the air gets cold it is more dense and you need to richen the mix a little and vice-versa....more air means more fuel to keep the 9000:1 ratio required for proper combustion. I don't mean to start wrenching on your carb with a 2 deg drop but 90 deg summer heat and 50 deg fall/winter temps require minor adjustments.
When you hear the blubber it is usually a tad rich which won't hurt anything, when you have it too lean it will run up and seem to lose power because it is being starved of fuel. I usually start rich and open the throttle and listen for max RPM then richen the mix until the RPM's drop to the point of "blubbering", but not a constant blubber...just where the RPM's start to drop. Most times you run the saw wide-open and you want to have adequate lubrication so adjust for that speed. Granted a properly adjusted carb will give you proper lube at all RPM ranges but you don't want to burn up a piston for a tiny bit of power.
