This is my P1, I have had quite a few issues with this one. Finally got it all sorted today, I could not get the carb to tune right so in the end I stripped the carb completely and soaked it in diluted CLR. You can't soak it for long, half hour max and then rinse well in soapy water.
Cleaned everything else and reassembled, it started and ran very rich. These mowers run on the main jet right down to a low idle. My settings in the end were main jet on 3 and low speed mixture screw out 1 turn.
I also found that having the spark plug set at .0018" is crucial with this particular engine/magneto.
I am very happy now but would highly recommend bench testing your engine before fitting it to your nicely repainted frame or you will end up with oil stains everywhere. I will be making up a diverter and attaching it to one of the frame bolts to wear most of the exhaust smoke/oil.
