It was very cold and threatening to rain/snow. Which makes for a miserable day.
I believe the cold weather (high 30s) was affecting the carb jetting. At high RPM and full throttle, the engine seemed to break up a bit. Since I didn't have a jet kit, I didn't think I could make any adjustments. However, in hind sight I think I could have. Since we're running the slide restrictor to about 1/2 throttle, I believe a needle clip position would help quite a bit. Thoughts?