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Drove a couple hours, parked a couple hours on a really hot day. When I fired up to return home, I had a problem with my tri-power 97's running a little rough at high speed (secondaries open). It cleared itself up after about 20 minutes. Suspected one of the secondary carbs was not feeding, but no way to check, since it cleared up.
Sat a couple weeks and I pulled the carb tops off to re-jet. Since I had the tops off, I did the invert and blow check that the inlet valves were sealing. All fine. What was not fine is that both secondaries were also sealed with the carbs upright. The float drops so the valves should be open. Shot a blast of carb cleaner through the inlet valves, and normal operation returned.
Conclusion: Something is causing the ball in the valve to stick to the seat. I run regular gas with ethanol, so things should not gum up that easily. I also put 4 oz of MMO in the tank every time I fill up. I wonder if that combination of MMO and alcohol could be causing the problem.
Anybody else with the sticking S-Jet problem using MMO in their gas?