The recommended spark plug for the 1977 model, 7.5 hp Mercury outboard is a Champion L78V, or NGK BUHW-2. Both brands are Perma Gap type plugs, with the Champion being the manufacturer supplied plug back in 1977.
The spark plug gap for a 2003 Mercury 125hp outboard motor is .040"
40
spark plug gap for a 1996 mercury 30 hp outboard motor?
What is the spark plug gap for a 9.9hp mercury outboard motor
.040
NGK bpr7hs-10
Ngk bpz8h-n-10
NGK BPR6HS-10 spark plug. Gap is .040
The 2002 model, 60 hp Mercury outboard requires an NGK BP8H-N-10 spark plug, the gap set to .040in.
Mine is a 2000 model and it has an NGK R BPR7HS10
The recommended spark plug for a 1992 model, 200hp Mercury 2 stroke carbureted outboard, is an NGK BU8H. This is a perma-gap type plug, so no gap setting is required.
Any motor should get spark with or without gas in it. The ignition system works off electronics and does not require fuel for it to work. Yes you should get spark.