[juanbenae]

The guy I bought my place from left some gardening equipment behind one of which was an Echo leaf blower. It ran good for a couple years and started to do what the OP describes, start, idle, good to half throttle only to fall on its face at foo, wide open. Cleaned up the carb, no relief. Got a replacement carb still the same. Took it into the mower shop and asked the owner what the issue could be. he said that most 2 stroke motors these days are set at a very lean mixture with no ability to adjust mixture, he could not even sell the special tool to adjust for emissions. This causes them to run hot pretty much destroying themselves sooner than older stuff. He suggested it was one of the crank seals at the case and that if i pulled the plug and apply a bit of air pressure from the compressor (<15 PSI) that might reveal itself. Sure enough, it was leaking at drive side so it was creating a huge pressure leak as throttle was applied. Remember a 2 stroke case is essentially the intake manifold so a leak at the crank was killing the mixture before the carb even came into play.

I gave up on CA fuels for my 2 cycle saws and such a long while back using the canned stuff. It costs some, but you can leave it in the tank for year or more w/o it spoiling or gumming up carbs as it evaporates.