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gmax137
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Sometimes, the second "plug hole" is for a compression release. Seen on old Brit bikes, if they don't have a "valve lifter."
Exactly right. Still done today on light piston planes, although it's more of a maintenance check every so often.Baluncore said:During WW2, the test before takeoff was to run the engine up to temperature and speed, then cut one magneto at the time to check the fall in RPM. A "magdrop" of more than say 150 RPM, cancelled the flight.
I have a double toggle switch panel somewhere here, labelled "Magnetos".
That could be but I do recall a plug in each hole and a wire on each. The Odyssey I used to ride only had one and I don't recall a comp release.gmax137 said:Sometimes, the second "plug hole" is for a compression release. Seen on old Brit bikes, if they don't have a "valve lifter."
Averagesupernova said:That could be but
Hey that's ok.gmax137 said:Sorry @Averagesupernova , my comment was not directed at your photo. More of a general comment.