Echo 2 stroke hidden carb adjustment

Purchased a PB-265LN backpack blower from a dude on FB sell page for $50. Pull started it to make sure it had compression before buying it and it did so instead of just repairing the carb on the unit i just bought a brand new ZAMA carb on Amazon for $12 LINK



While waiting on new carb to arrive i decided to take apart old carb to see if i could get it running.Took carb apart, cleaned all passages,replaced all fuel lines and fuel filter and damn thing still wouldn't crank and stay running.

New carb comes in, install and still won't stay running unless i hold my hand over the intake(makes the motor draw in more fuel)

. I'm baffled at this point. I pull off the muffler to inspect for carbon buildup. I see none but decide to warm the propane grill to 600 degrees and cook it for 25 minutes anyway. Reinstall muffler with spark arrestor removed and the damn thing still won't stay running on its own.

I finally run across a guy who mentions a "hidden mixture screw" on google. The factor carb had a plastic plug that needs to be drilled out to access the small flathead screw but the new carb didn't have the plug.


Anyway, many Echo trimmers also have this same carb and once the small plastic plug is removed, high jet tuning can now be performed as easily as inserting a small flathead screwdriver without removing anything.






Figured this post may help Echo owners out for future issues with their blowers or trimmers.