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Ray, you don't need to remove the casting plug to clean the idle & other fuel circuits. You will have to pull that casting plug to replace the lower throttle shaft bushing if it's worn. [New ones are available from Roberts Carb if you need them].. ~You will have to remove the little brass screw slotted passage plugs to clean the fuel circuits. [Be careful, those brass plugs damage easily].. ~Don't force those small brass plugs too hard or you risk tearing them up then they will be very difficult to remove. To get those brass plugs out just heat until a dull red then let cool, then they will usually come right out without damage. [Remove the float bowl & dry the carb out before heating those plugs or you risk blowing the carb up]. ~Once the plugs are out, use a stiff wire to clean those passages or if there is rust in the passages use the correct passage drill bits from Roberts carb. CAUTION: don't use those drill bits to clean or alter any small passages or the vent system. Don't forget the little hidden passage hole in the bottom of the stem. ~Pull the main nozzle from it's bore, just run a tap in the bottom of the nozzle [you don't need to drill it]. Don't run that tap in any more than 3/8", then use a small bolt or piece of all-thread with a few washers & a nut to pull that nozzle out... CAUTION: don't pry on the top of that nozzle to remove it as damage is sure to result & a damaged nozzle won't meter correctly ~While it's apart pull the bowl vent baffles from the top of the bowl casting & clean them & more importantly the passage under the baffles. ~When re-assembling, make sure the float swings free & doesn't contact the bowl or stem. I always just set the top of the float parallel with the bowl gasket surface. ~Look closely at the throttle plate to make sure it isn't worn on the ends [a common problem] & if it's still good be sure to center it correctly in the bore [hold it up to a light source to see how the throttle plate fits the bore]. ~I always Loc-Tite the throttle & choke plate screws as those little jewels have been known to come loose & imbed in a piston top. ~If you need a picture of the passages that need cleaning just give me an E-Mail....
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