I resently changed the t slot to a .059 from a .055. Engine sounds smoother and runs cooler. I seem to have a pump gas issue and i think it might be the ethanol boiling in the squirter circuit on a hot air temp day. Cool engine and cool air temp if goes away. I can watch the fuel spurt out of pri squirter at idle with hot engine and air temp. Switched brand of fuel and got worse.