No offense taken Cray, it's confused the crap out of me.

The motor was running great when the lower went out. I put the new lower on, and did the break in starting at 1500 rpms and slowly working up to 3500 over a 5 hour period. The motor ran great that whole time, other than about 5 minutes towards the end where it spit and sputtered. When it got time to throw the coal to it, there was no power. Not coming out of the hole or at top end. I couldn't turn over 4200-4400 RPM's.

In my mind, the most likely culprit was the new SEI lower, since that was all I had changed on the motor.

I finally think that I figured out the problem this afternoon and it was something so simple that an experienced mechanic would probably have found it in the first 5 minutes of checking the motor. When I did a leak down test today, while I had the motor turned to TDC1, I looked at the piston and it was coated in wet, black oil residue. The plugs were real wet too. I guess the problem was the motor being overly loaded with oil residue from basically idling for 5-6 hours. I did a "decarb" and put new plugs in and it completely changed the engine. I haven't swapped back to the larger prop yet but it will over rev now with the small one on. I couldn't run over 2/3 throttle. At 2/3 throttle I was turning 5800 RPM's and I didn't leave it there long and sure didn't want to go over that. I "think" it's back to where it will now turn the 20P prop at 5400, just like it would before the old lower turned loose.

If I go out tomorrow after church or Monday it will have the 20 pitch prop on it. If it doesn't run good, then it's just about got to be electrical because it ran at more RPM's with less throttle today than it has with the smaller prop on it.