engine runs rough

[Slyfox]

checked my muffler last night, took the two front pipes off and the inside looked like new. outside looks like new, no cracks. back to lookin.

took and reset the plugs to .022 last night. Number 3 cylinder was very clean on both, the others looked slightly wet and brown, little black on the outside ring. Doing some reading that might be normal for idle back to the hangar.

My thoughts if this continues is to remove the prop and tear into the gear box. check the hubs for wear, that's really all that's left. I have an IVO medium prop and I'm at 800 hrs. I removed the magnet plug and it's got just a light film of black. sorry to say, it's the first time I've checked that magnet. so judge on that for material. I've read that even with wear on the hubs that magnet will still be clear. I also use Amzoil 10-40 motorcycle oil, have since first start. opinions. Yes I know, it's time to do the gear box.