Originally Posted by
Mckojr
Don, 2014 Mercury 150 Optimax Pro 2 stroke S# 2B117592 -- parts manual shows NGK IZFR6J-11 plugs. I have read where people state the gap is @0.35 isnt it supposed to be 0.41 ish on the 150 Optimax Pro? Dealer replaced my plugs while back and when I pulled them they are all set @0.35. Runs ok but hard to start at times. Low Idle great. Replacing plugs myself this time due to motor hard to start after running. Turns over great but sputters and coughs then fires up but NOW after plug change no difference in starting but idles rough and stalls out on idle. I was able to purchase NGK IZFR6J-11 plugs (pre-gaped at 40ish. -- again when last dealer replaced the plugs they used NGK IZFR6J which they gaped at 35ish. Which plug gap do I use on this motor? Any ideas on why so hard to get running after stopping. acts like flooding with fuel. New batteries, all 3 new fuel pumps, new alternator, new starter relays, fuel pressure in the 90's and air pressure in 100's (sorry gauge doesn't read higher than 100 to give you an accurate number on this)
Thanks for any help you can throw my way
Mack
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