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1983 Mercury

D

Duke68

New member
25 HP tiller steer. Engine starts easily when cold, runs at idle and top speed. Warm engine starts with great difficulty. Have to choke it. When it starts i have To open the throttle quickly or it dies. Again runs fine at speed. So why is a warm engine so difficult to start. Must be ignition or fuel, right?
 
Right. Start with ignition. Do a spark jump test when warm. Pull both plugs and look to get a nice crackle white/blue spark to jump 7/16 or 1/2". I'm working on a 25 right now in fact....going to test spark. Often times the switch box will loose snap when hot. Have seen same with trigger and even stator. Had a Belgian made 4 horse that did the opposite, however....only had adequate spark in hot sun.....once cooled down, nothing. Nasty diagnosis. Made me a fool.
 
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