John Deere 40v poor running

[Cheap40v]

Hi all I am new to the site not new to chainsaws. Recently I picked up a John Deere 40v (echo 351vl). I pulled the carb apart, looked clean and the diaphragms looked good. But it bogs when revving and falters at high speed.

 

[rmotoman]

Nice saw. Welcome to AS. Have you looked at the fuel lines?

 

[Cheap40v]

The fuel lines are malleable and flow good.

 

[Duane(Pa)]

Diaphragms are hard to assess visually. They can get stiff from ethanol fuel and not deliver enough fuel at upper RPM's I had the Echo version. Good little saw, very handy and light. Worth fixing. I would start with a carb. kit.