Small Engines (Lawn Mowers, etc.): 8hp kohler, fuel mixture, blue flame

Question
engine starts  blue flame puff out exhaust  spits out carb is this timing or carb trouble  setting carb does not seem to matter  plug is clean and engine seeems to to get hot  could it be the valves   please help

Answer
chuck
White or blue smoke while running may be an indication of an excessively worn cylinder or rings or a clogged or inoperative breather (the breather assures that there is always negative pressure in the crankcase - if not, oil can get forced up into the cylinder). Or, you may be using the fuel mixture for your 2 stroke weed whacker by mistake!