change impeller or check for blocks in water lines
The oil / fuel ratio for the 10 hp Chrysler outboard, would be 50:1, roughly one pint of 2 cycle oil, to six gallons of fuel.
A Vintage Johnson 857171 outboard motor is from the year 1975. These small motors were designed for fresh water use on boats between 10 and 15 feet in length.
Chrysler's population is 10.
Ngk bpz8h-n-10
A Johnson outboard, model number LT-10, would be a 1940 model, 5 hp motor.
not sure how wide your Jon boat is but I would go with a 3.5HP or 5HP outboard no bigger
75 lbs.
The Yamaha Pro 50 outboard requires an NGK BR8HS-10 plug, gapped to .039in.
10
NGK bpr7hs-10
The 1977 model, 70 hp Evinrude outboard requires an NGK BZ7HS-10, or a Champion QL77JC4 Plug gapped to .030 in.
The 1998 model, Yamaha 250 hp outboard, requires an NGK BR9HS-10 spark plug, gapped to .039 in.