My motor is a 1968 Mercury 500 (50 hp) 4 cylinder serial number 2105127 On my 16' Shellake fiberglass runabout, top speed with all 'un-necessary' gear and land lubbers tossed ashore, top speed was 20 mph. The addition of a first mate dropped the WOT speed to about 13 or 14 mph. The previous...
