i have a picco 27 and i am a newbie at tuning engines. after the engine has warmed up it bogs at full throttle even if at have a half a tank of fuel left or more.i leaned the hsn only a quarter turn from factory and lsn about a 1 and half turns.when should you do the pinch for the lsn when the engine is hot or cool.this is getting very frustating.the temps are running at the 300 area.i am using a mc59 plug as well,hope someone can help.