Success!
Got the bike put back together Sunday. New piston, rings and gaskets showed up Friday. Honed the cylinder and put it all back together. Got the motor back in the bike and enough stuff back together to hear it run for 5 ~ 10 seconds on a shot of spray start. Woo Hoo!
At one point, I was turning it over with the e-start to get oil pumped up to the head, and I did a quick compression test, even though it's never been fired and was cold. It made about 150psi, so I'm well pleased. Shop manual says 178psi, but that's warm and with seated rings.
As for air filter, I used a Uni-style foam universal. All I did was remove the stock carb-to-airbox rubber tube. Fits well, so I'm hopeful this won't happen again. Especially when I fabricate a few bits to help deflect rear tire mud flinging.
So, there we go. Lesson learned. Thanks to everyone for links, support and discussion.
Kirk
