I'm having a problem with plug fouling after putting a new powerhead on and adding some boyesen reeds and a set of 50 hp carbs. I've checked the timing and it's good, the correct champion plugs are in it. The air/fuel screw is at it's best setting, 2.25 turns out. The carbs are the early style vs. the newer style. It runs great until I idle for a period of time. It seems to load up with fuel and starts to missfire. I can put it in neutral and rev it up a few times and it clears up but then comes back if I keep idling along. The number on the carbs is 432989 on both. I've looked everywhere and can't find this carb. number. I'm curious if the low speed jet may be too big?
