Carb Cleaning

Videos of disassembly are provided by John Aylor in the links below:

Disassembly video Part 1
Disassembly video Part 2

I - Disassembly

    A - Remove float bowl
            By slowly & carefully removing float bowl you may be able to save the gasket for reuse.  Use a knife to peel the gasket as the bowl is being removed.  Carefully examine the overflow tube for fracture or loose fit as this can be a source for leaks.
    B - Remove the float
            The float is fragile.  Bulbs can easily be dented.  If they have recently been submerged in fuel, shake them and listen for fuel inside.  They are prone to leak with minute pinholes from corrosion/oxidation.  Pinholes can be repaired with solder if done properly.
    C - Remove float valve
            Old float valve assemblies should normally be replaced as they are prone to leak with corrosion.
    D - Remove pilot jet
            Always use a screwdriver that has a good square tip as a rounded tip will easily deform the pilot slot and make removal a serious problem.  Note the pilot size stamped.
    E - Remove the main jet
            Note the size stamped.  Do not lose the fiber washer.
    F - Remove the needle jet
            The needle jet can be removed by reinserting the main jet for a couple threads and then tap lightly.  This will unseat the needle jet and allow easy removal.  Do NOT pull on the jet at the choke shield as it is easily distorted.

II - Cleaning

    A - It is best to soak all parts overnight in a good carb cleaner.  Berryman's is available at Autozone, etc. and comes with a dip basket inside a gallon container.  It will not harm phenolic inserts in the carb body.  Observe safety precautions and use in well ventilated area.  It stinks!
            - If carb cap is being cleaned, remove the gasket to prevent damage.
            - If the float is weighted so it will be submerged it can later be checked for leaks by shaking.
            - After soak, blow out ALL orifices with compressed air.
    B - An alternative to soaking is to use brake cleaner to clean/blow out all orifices.

III - Inspection

    A - All orifices in carb body (including those at air intake) should be clear.
    B - Pilot jet should have clear holes at each end and through the body.  A fine wire (guitar string) can be used to clear holes.  It is very important to not distort or enlarge holes during cleaning.
    C - The needle jet has an orifice at the side that is prone to clogging.
    D - Insure that no fluid is present inside floats.

IV - Reassembly

    A - Reassemble in reverse order of disassembly.
    B - Be sure fiber washer is on main jet.
    C - Do not over tighten pilot jet.
    D - Insure that float needle moves freely.
    E - Reset float height.  Simple gauge:
    F - Insure that gasket is present and properly seated in cap.
    G - Insure that slides move freely within carb body.

V - Tuning

    A -