freebilly
ArboristSite Lurker
That is correct, another reason I am confident it wasn’t running lean on the high side.I would like to comment on the piston scoring due to high end lean condition. The OEM carb on cs-590 has an extra fuel "nozzle" on the high circuit. It has been well documented on this site. I believe it is difficult to lean these saws on the high end. IF, the carb is in working order...