Echo pb-413 leaf blower not running properly

Issues like this could well be a ignition unit breaking down when it gets hot.

Replace the fuel filter. The fuel on it varnisized(gummed up). I had a similar issue with my trimmer.

Most likely there's a problem with fuel supply - choking cuts air supply optimizing the air/fuel mix. Most common solution is to check and clean the carburetor.

If there's a tiny fuel filter in the fuel line between tank and carburetor check it on excessive pollution. Replace it when necessary.

When opening the blower for carburetor cleaning - also check the airfilter and replace when dirty.

If never opened the blower - take pictures with a digital camera at each step. The pictures can help with assembly after cleaning.

on the handle is a start stop switch, if its on stop, it wont turn over

Sounds like it has seized up. If the pull cord won't pull then the motor is locked up. Did you run gas/oil mix for the fuel its a 2 cycle motor...

i have aecho pb 260l backpack style leaf blower and it will not start. it turns over well and has spark and reasonably new fuel. any thoughts

Echo tools have a screen in the muffler to arrest sparks. Take off the muffler and remove this screen

My echo uses 50-1 ration. Home Depot sells the small containers for Echo Leaf Blowers that you mix with one gallon of gas.

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....