Originally Posted by Hightower
But what should the plug gap be for a 150 Evinrude DI?
Looks like it's been idling for a while before you turned the engine off. You can't really tell from that.
Do a plug chop.You probably know how to but just in case, here you go:-
Borrow an aux or get someone to follow you to tow you in as you'll have to kill the engine while at speed.
Warm it up, go for a nice run at a STEADY 3/4 throttle for a minute or so (in calm water if possible) and pull the killcord or turn the key off while running at 3/4 throttle. Get back to somewhere you can take the plugs out without using your main engine.
Remove your plugs. Take all of them out to make sure and make sure you know what cylinder they came from. They should be a nice tan/brown colour-and all the same colour.
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