Nathan,
The bottom of the SU pistons have a tiny nylon bump stop in them.
Idea is for the piston not to sit flat on the floor of the throttle, but let
enough air in...... to allow you to start the engine! :)
So lifting the piston to start, and then everything running OK are
those tiny bump stops. Oh, keep a pair of leather gloves in
the car for this reason.
I still see the digest, but never have time to read them until the weekend
rolls around, but it is already time to head out to the shop to work on the
airplane project.
Tom
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