Ok. On ours and 78'S
I BELIEVE
we have a slow idle jet/circut that it pressed into the body of the carb.
If you boys were anything like me, you look right past it when pulling jets and such to clean.
it looks as if it is a piece of the body. It is in BETWEEN the main jet and the air mix screw. This is the best picture I can find.
I carefully i emphasize CAREFULLY because people tend to clamp too hard. It's my understanding that this piece is brass and can be pinched shut all too easily.
I used a small pair or vice grips and patience. after taking the #1 float and needle out, I realized if you're careful enough, You can just depress the float to get a hold of it.
If you haven't already went through the carbs, take them out and clean everything.
I clamped, gave a 1/8 turn either direction and pulled upward. It comes out easily enough.
Clean, clean clean. There was 8 holes i believe in mine and out of all 32 on the slow jet circuts there was only 2 clogged. I cleaned and reassembled. Take this time to adjust your floats. According to manuals they should be between 12mm and 14.5 mm. I set mine at 14 and have experienced no drippage since then.
When you go to put the jets back in, they don't take alot of pressure and make sure to make it level, don't just jam it in there.
Hope this helps.