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Still alive! Anything after 1986 can run the QL77JC4 (or just L77JC4). The head design changed to allow a J gap plug. The surface gap plugs will be too cold &’cause fouling problems. Don’t go there! I think you are getting real close to closing this one out. Don’t forget to keep the engine cover (top) level with the water line while idling around. It makes a huge difference in idle quality. After you start to speed up as you leave a no wake zone just trim under to take off. It becomes second nature. Same thing when you come off plane. Back up to level. If your trim gauge works just note position on gauge. It all becomes automatic with practice. It really helps the drain system work better & exhaust relief work better (two little holes in mid section) at water level. Don will care you thru! Gotta take a nap now.
Dan in TN