I agree with Jim on cleaning it out first, but if its clean, and its still acting up, your gonna be looking for "around" that spec of drill bit to make the main jet right, right off the bat. If the M carb bowl is a bigger jet, and it runs good, match em up to each other. To do it right, remove the discharge stem, and the main load adjuster screw, I have set em up in a drill press, but have found a hand held bit driver is perfect to open up the jet. Go small and work your way up, 5 turns out will still play into effect if its done right, but if its clean, lean is mean and its gonna give ya trouble in the long run.
I own 4 almost identical Super H's. All have the 3.5 overbore kit with firecrater pistons. Each were built identically with one exception of the 53 had the head shaved to clean up some pits so it has a bit more compression, maybe 10 psi more over em all, if that. 150 psi for 3 of them, 165 for the one with the head shaved. All 4 have a .080 main jet with stock metering stems, all of em run rich around 4.5-5 turns out, where before, I could remove the adjuster totally and still ran with no load. Hope this helps, but I hope its only dirt,,,,,,
True differences, choke lever location, idle jet diameter, main jet diameter, venturi size, and the rare Super H part number on the tiny ID tag. Other than that, the throttle bodies are the same as a Super H thru SMTA, in the carb bowls, the discharge stems are the same, gasket kits are the same.
Been working on these old Super H's for 20 years, they aint let me down yet in the working clothes.
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