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Not sure what carb you have..You should be able to see a spring loaded air/gas adjustment screw on the carb..once running turn clockwise until motor starts bogging down then the other way until it does the same..keep adjusting back and forth unti it runs smooth..
you may have another on the bottom of the carb bowel..do the same with it...if this doesn't work needs a rebuild kit..good luck..
I just fixed my Echo PB 2100 with the same issue. It would start, run, all throttle openings OK but would not rev-up. It was a dirty/clogged screen on the muffler. Scraped the thick tar off then used Lacquer Thinner to soak it clean. Blower works better than ever now....
Had the similar problem- start with removing the exhaust intake plate 1st--- clogs with super fine dust initially then larger particles... Mine was completely clogged- cleaned er' out now she blows like the wind!
when I start my echo-PB751t it makes a knocking sound
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