During the rebuild I also installed the N3EJ needle in the middle position and just went to town riding it. I will likely go up on the pilot (currently a 38) to a 42. It has a 172 main in it.
The weird thing is, I took it up about 7 thousand feet higher than I normally ride it, so I assumed it would just be so much richer than normal I wouldn't even bother reading the plug until that trip was over.
Locally, I ride around 4,600 feet. I had it up to 13,000 feet and as low as 7,400 feet while riding it on the fresh top end.
That leaves only cylinder head torque as the contributing factor to the engine's premature failure.
Thankfully, it made it 4 days of long hard riding and died in a giant cloud of sweet steam at the end of the last day only a couple miles from camp.
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