either its running to lean or you have a bad exhaust valuve
The 1979 model Johnson 9.9hp uses a Champion L77-JC4 spark plug.
The 1979 Suzuki 750 spark plug gap is .018. Most spark plugs will come pre-gapped from the spark plug manufacturer.
NGK B8ES
I have a 1979 Evinrude 35 Hp Model 35902A and it has Champion L77SC4 Plugs in it and it runs great. Hope this helps
The 1979 Honda motorcycle spark plug gap is .013. Most spark plugs will come pre-gapped from the spark plug manufacturer.
I recommend you install AC/Delco spark plugs. The exact model plug depends on your exact application. Any auto parts store can provide the correct model plug.
1.1 mm Do not use Bosch plugs. Anything but. Bosch do not work well in Japanese designs of engines
18436572
Passanger side of engine, comes up between spark plug #2 and #4 (first and second spark plugs from the front on the passanger side.
The recommended spark plug gap for a 1979 Olds 4.9L is .060"
what is the spark plug gap for a 1979 Honda odyssey
It is in the gas tank