#1 -I believe Bruce is right, an OMC alky Midget engine.
#2 -Quincy deflector.
#3 -Konig gas C......Note the Quincy exhaust, Sems mag, and fuel pump.
#4 -A later model Crescent with a cool CD set up. Hard to tell if it's gas or alky cause' you can't see the carbs. (Would hate to be the pit man standing beside that engine should a magnet explode!)
#5 -Looper, C, D, or F that's the hard part. (Look on the bench to the right..2 Konig powerheads.)
#6 -Bob is right, could be an A or B Anzani (That was easy!)
#7 -Johnson PR with aftermarket cylinders and heads.
#8 -Late model 5 port 500cc Konig.
#9 -Lockwood Chiefs.
#10 -Later model FA Konig. Two pipe, and CD ignition (Scatter shield for the magnets) Note the older Konig blue / white logo on the carb sheild.

A breathtaking collection.........Please show us more Paul!