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The spark plugs on a 1988 model, 70hp Johnson outboard, should be gapped to .030in.
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The spark plug used in the Johnson 200 Ocean Pro is the Champion QL78YC. The proper gap for this plug is 0.030 inches.
.044
.044 mm
The recommended plug gap for the 2000 model, 4 hp Johnson is .030 in.
Champion J6J is the recommended plug which has been changed to J6C by Champion.
The recommended plug gap for the 1972 model, 20 hp Johnson outboard is .030 in.
Johnson 6hp spark plug gap
The recommended spark plug, for a 1984. Thunderbird 302, V8 engine, is a champion spark plug. The spark plugs can be purchased at most auto-parts stores.
0.035 is the gap size
The recommended spark plug gap is .044"