Hi dave, Soon as I looked at your photos, I wondered about balance like Scott is thinking. What your doing is interesting. Any chance to run it yet. Everyone mentions how smooth these engines run, and they do, but I have noticed a resonant vibration as the engine is accelerated. This is common with all single cylinder engines as you must already know. The connecting rod looks like it is light enough and who knows you could have very well come up with something. It is possible than it could run even smoother. Have you run your Weedeater yet. My Weedeaters run smoother, even more so, than the Toros and I love that about them. Any way to weigh what you removed for future reference?, It would require a powder scale or equivalent scale. I am going to look at my engine, I have the jug off and am getting ready to take about .020" from the bottom because I got a bit aggressive with raising the intake ports. I also need to write down your port timing measuements, I just can't keep that kind of stuff in my head anymore, thanks for giving them. I printed your photos and they came out great. I just noticed that your piston now resembles some automobile pistons. This is for a single barrel engine, correct? I can't wait to hear a running report. Good job so far.