In Reply to: 8N breaking down as throttle is increased posted by William on June 16, 2023 at 11:13:08:
I would investigate why the plugs look carbon fouled. Adjusting the carb should make a difference in the way the engine runs. If it didn't, that should be checked. Test for a wek spark either with a spark tester or an old plug. If the iginition system is in good shape, a spark should be able to jump a 1/4 inch gap. If it doesn't, you need to find out why. I think you are assuming the worst and least likely of the problems you noted.