My stihl 044, saw is starting to bog down at full throttle. Its more pronounced when the saw is first started cold. After starting the saw I rev it up and down to warm it up. But when it hits wide open it bogs, so I feather the throttle to keep it going. When I start to cut it warms up and runs better. But as soon as it is rev'd wide open it loosed some power. If I back it off to 3/4 throttle, it rev's higher. I can feather it to wide open, but if I "crack it" and hold it wide open it can't catch up and I'll have to let it idle down and feather it to wide open. The saw runs great at a idle, and I can still cut, but full power is just not there. I always use high octane gas with stihl oil. Maybe the high setting on the carb needs to be adjusted, I havent tried that because it has always run great since I had the saw (13 years). I didnt want to start messing with the carb adjustments until I came before the experts (thats you guys), first. One other note, I put a new piston in the saw about 4-5 years ago, the old piston for some reason just shattered. I dont think this has anything to do with the current problem. I've cut a lot of wood since replacing the piston.