High speed problem with two Echo leaf blowers
I had two identical PB-200 Echos in the shop at the same time, from different owners. Both would start, rev up high and then bog down. I had to manually move the choke lever at which point they would rev up again and then bog down.
Both have clean mufflers internally. Both have good compression, clean fuel and a new plug. I rebuilt both with diaphragm and gasket kits, plus cleaned all orifices and jets. One had the new hose kit and bushing for the tank. Both still run the exact same way.
I noticed that one had rust on the steel parts, caused by water in the ethanol fuel. Fuel additives are required for this fuel.