In 2 stroke dirt bike land I've always jetted my bikes by using a few new sparkplugs and running the bike at different throttles. 0 to 1/4 throttle for the pilot jet and wide open for the main. I then check the color on the spark plug for that nice tan color that tells me I'm in the right place. Obviously white would be too lean and black would be too rich. Does anybody use this technique on their saw? I do understand there are differences where as I would change jets in my bike carb while I would adjust the low speed and high speed screws on the saw carb.