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screw air mix screws in the out like a half turn each, one controls the high end speed and one controls the idle, do idle first and adjust just a little rich then do high speed screw.
it is always better to use to much oil than not enough, using not enough will cause major damage to the engine. The oil in the gas mix is what lubes the cylinder/rings against the cylinder walls. 40:1 is way lean of oil for a 50:1 mix engine
Before you go through the trouble of dismantling the blower to get to the flywheel you should perform a compression test. 140 psi is ideal. Less than 100 its probably not worth repairing. Less than 90 it shouldn't run.
Model and serial number are underneath the recoil starter, on the engine block. Tip the blow on it's non-engine side and look right above the tank from underneath the blower.
its possible the gas pickup tube inside the tank is bent and not reaching the lower tank,this is just a flexible tube in the tank,otherwise,loosen the gas cap when it kills,sometimes they go bad and create a vapor lock
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....
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