hi, i just bought a boat with an 84-86 mercury 75hp 4 cyl. it skips and pops some when it runs with muffs on. dont want to try it in the water until it runs much smoother. i was told the coils, and pcm were replaced. compression is about 130 all 4 cylinders. new plugs. i checked wiring and found some corrosion and weak wires. 2 went to the trigger so i ordered a new trigger and merc flywheel puller since a normal puller hasnt been able to budge it. do you think the trigger is the likely cause to it stumbling and rough idle? it starts with a little diffuculty, and then will idle all day but def stumbles and skips. give it gas and it sounds alright. when i pulled the plugs out, #1 had some black deposits that looked normal and #2,3,4 still looked brand new but were just wet with gas. no black carbon deposits on it. still looked brand new as if they werent firing. im new to outboards so any info will be great!
thank you! im in nh btw and if anyone is close that knows these engines esp when it comes to the timing, i could really use the help. ive been reading and watching youtube but it still seems so foreign to me when it comes to setting the timing.
thank you! im in nh btw and if anyone is close that knows these engines esp when it comes to the timing, i could really use the help. ive been reading and watching youtube but it still seems so foreign to me when it comes to setting the timing.
