Spray carb cleaner is like painting with a rattle can while standing in the neighbors garage.
Get the good carb cleaner (Berryman's Professional) (about $50 a gallon) - disassemble the carb (turn the fuel screw all the way in till lightly seated counting the turns so it can be set back to it's original position) then remove the fuel screw. Make sure you get the spring, washer and o-ring out of the fuel screw hole. Soak all the metal parts in the cleaner for about 4 hours. Remove from the cleaner and rinse with lacquer thinner. Blow compressed air through all the passages making sure air comes out from the holes where it is supposed to come out from. If there any doubt about the jets, use new jets and assemble the carb. Set the float level per the instructions in the service manual. Put the spring, washer and o-ring on the fuel screw and install the fuel screw to it's original position. Install the carb making sure not to over tighten the clamps (which can cause a vacuum leak). Using fresh 93 octane fuel, fill the carb and start the engine. Run the engine for about 5 minutes to allow sufficinet warm up before setting the idle. Set the idle speed to the desired RPM and make final adjustments to the fuel screw.
