Originally Posted by
av8tor1977
J...................................You can plug that Stihl rectangular regulator cover vent with something like epoxy, (I use Seal All), then drill and tap it for a fitting and run a vent line into the fuselage. I do this on all my planes.
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AV8TOR
I ran the engine in the plane on the ground today. It did still have the high RPM occaisional miss-fire.
Then I did the little mod to the pump vent along the lines you describe, but did not need adhesive as this model has a rubber grommet into which I could fit a specially made adapter. I ran a hose from this to the fuselage, ran it again and it did not miss-fire!
I have yet to fly it again, but hope to do so soon.
I think you suggestion was the reason for the problem. Time will tell for sure when we fly it again.