Check the outlet port on the piston for grooves, there may be loss of compression, also piston clamps with heat by fuel and / or possible adjustment problems by emission limitation applied on L + H adjustment
It is very easy to flood this item mind you its easy to flood all petrol trimmers. If plug is wet simply turn the switch to off and pull cord at least 15 times you should get the engine to start coughing keep pull cord but do not turn the petrol on do not prime it either. It should catch. If it does not push the primer once and pull cord
SOURCE: runs for a little while the blower it is echo pb 620
these do this all the time just let it sit for 10 minutes and it should fire back up.
SOURCE: I have a Echo PB/251 Gas Blower which I recently
Check the muffler and/or spark arrestor screen in the muffler outlet pipe and also the engine's exhaust port behind the muffler. These are prone to carbon-clogging and the engine cannot "BREATHE" enough to reach full throttle. If all-clear in the muffler, go back in the carb and locate the inlet screen directly opposite of the inlet needle. Carefully pull it out with a pick and hold it up to a light source. If you cannot see thru it, replace it. This is another, (less) common area of obstruction.
Hope this helps,
Dolf-
SOURCE: brand new echo pb-251 blower, used it 3 times for
you can thank the EPA for your blower problem the EPA makes all brands of lawn equipent "tamper proof" with plugs and limit caps. not just echo......when we service an echo piece of equipment we let it "break" in and adj the carb as needed BEFORE it leaves my shop. dont hesitate to bring it back to the dealer, if they are reputable, they will do the adj while you wait......hope this helps. good luck
SOURCE: Echo leaf blower will not start....leaks fuel from
sounds like u have a carb problem,ether theres debris stuck in needle valve needle is stuck open or the check valve diaphram is bad.take carb off on one side there is a plate with 4 screws remove then agasket and diaphram remove them some times they stick to carb so use a razor blade to go underneth diaphram all around from center youll see a metal see saw with a pin going through if u push on center it will lift needle valve on other side make sure it goes all the way down or remove by removing screw that holds pin in and blow out with air lightly may blow seat out after that on other side of carb take other plate off by center screw that diaphram has 2 little flaps check valves make sure they are limber and not wrinkled or bent if so u can get new ones at good mower shop or parts supply hope this helps
SOURCE: ECHO PB-250 blower new used one time carb.needs
Your machine has a rotary-valve diaphragm type carburetor. These carburetors typically only have an adjustment for the IDLE speed with an available option to control the main jet with an adjustable mixture needle.
http://www.echo-usa.com/Products/Blowers/PB-250
Here is the info on the Zama rotary-valve diaphragm carburetor.
http://www.zamacarb.com/prodlist.html#RB
Some have a small adjustment needle in the center pivot of the rotory part, under a brass plug...but most have nothing. Many end users and techs are complaining about the non-adjustable carbs. They are made this way to meet the more stringent EPA emissions codes that are getting tougher each year.
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