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1996 year of manufacture.
Many early model, smaller hp Mariner outboards were manufactured by both Yamaha and Tohatsu. These models were of different design than the late model engines. This may be the problem.
On the hood
Ahhh 10HP
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The "OC" model 75 hp Mercury outboards were manufactured in 1990.
The "OC" model 75 hp Mercury outboards were manufactured in 1990.
The 100 hp Mercury/Mariner outboards use an NGK BP8H-N-10 gapped to .040 in.
A 9.8 hp Mercury outboard, serial number 5123082, would be a 1978 year model.
id say around 75 mph we have the same motors on a 25 foot coast gaurd boat
Johnson outboards, model RDS-24L, would be a 1962 year model, 40 hp. the boat motor is a 50 hp.
50:1 is used by most OMC 2 cycle outboards.