MarkEagleUSA
ArboristSite Guru
I just gutted the muffler on my unresponsive 128LD trimmer to see if I could get some more power. While a little louder, it seems a lot more snappy than it was. In reading the specs, Husqy calls for 2800-3200 RPM at idle which is no problem. They list Max RPM at 11,000 and Output Shaft RPM at 8,000.
Adjusting the carb with the aid of a tach, I can only get to about 8,400 RPM before the motor starts to really scream (lean?) and I don't want to burn it up. What's the proper way to tune a trimmer carb and should I really be targeting that 11,000 RPM?
In regards to the Shaft RPM, isn't that directly driven off the clutch (1:1) or is there reduction in the bevel gear at the head?
Adjusting the carb with the aid of a tach, I can only get to about 8,400 RPM before the motor starts to really scream (lean?) and I don't want to burn it up. What's the proper way to tune a trimmer carb and should I really be targeting that 11,000 RPM?
In regards to the Shaft RPM, isn't that directly driven off the clutch (1:1) or is there reduction in the bevel gear at the head?