Tohatsu 50d timing

[Hill]

I've advanced the timing, but that's not the issue. It'll run strong for a minute then I seem to lose about 500 rpm. (That's a guess) I had a loose coil that I though may not have been grounded. Fixed that too. Tonight I cleaned the carbs. Main jets were clean but the "other" jets. Were clogged. What are these other jets? The ones under the rubber plug? Are these idle jets? Is there an easy way to check if the fuel pump is operating correctly?

Thanks,