its not that the clutch is inboard or outboard, it's the shape of the drive sprocket. i use a poulan ''pro'', (yea, right) 42cc i got for cheap off ebeware for firewood. i gutted and opened up the muffler and tweaked it up and it is great for what i use it for. nice and light and good enough power. anyways the sprocket that came on it felt like a flintstone saw when you moved the chain around it by hand. the teeth on the sprocket just didn't mate up with the drivers worth a darn, and it sounded like a rock crusher when you ran it. so i ordered up a 16'' gb bar and carlton chain and sprocket and it made 100% improvement. wanted to go with a rim drive, but couldn't find anything for it. i think the vibration that occurs with these ill designed sprockets will kill alot of these saws before there time.