Engine runs great...but smokes a lot at low revs, none at full throttle. I use 32:1 mix and have tried adjusting the needle (brass screw) on the carb body but the engine doesn't seem to respond to adjustment while under way...just keeps humming along. Is this a low speed jet adjust only, and if so, how to adjust it? Or is there some other reason for all that blue smoke?<br /><br />Also, the water pump (just replaced) dribbles at full throttle under way, but gushes at low throttle when stationary. Is this how it's supposed to work? Seems backwards to me.<br /><br />Finally, anyone know how to keep that pesky brass anchor/clamp from popping off the end of the recoil spring? Seems I have to fix it every few months.