95' 120HP FORCE FOULING #1 PLUG

M

MELL

Recruit
Joined
Jul 15, 2003
Messages
2
THIS BOAT SAT IN STORAGE FOR 1 1/2 YEARS. WHEN I STARTED IT IT RAN PRETTY OK BUT WAS MISSING JUST A BIT. I REPLACED THE SPARK PLUGS AND THE ENGINE ACTUALLY RAN WORSE! I USED THE RECOMMENDED PLUGS L76V. COULD A BAD PLUG WIRE CAUSE THE PROBLEM? ALSO THE TOP OR #1 PLUG IS BLACK WHEN I PULL IT OUT #2 SLIGHTLY AND #3/#4 ARE JUST FINE. I WOULD APPRECIATE ANY ADVICE ASAP. WERE GOING CAMPING WHICH INCLUDED BOATING UNTIL NOW? FOR ALL THOSE WHO DISLIKE FORCE MOTORS I HAVE ONLY HAD MINE FOR 5 YEARS BUT IT HAS BEEN GREAT!! THIS IS THE FIRST PROBLEM I HAVE ENCOUNTERED. :(
 
J

justinthehorse

Recruit
Joined
Jul 15, 2003
Messages
5
Re: 95' 120HP FORCE FOULING #1 PLUG

Have you ever decarbonized your motor with a product like Mercury Engine Tune?
 
M

mantis80

Cadet
Joined
Jul 15, 2003
Messages
22
Re: 95' 120HP FORCE FOULING #1 PLUG

I recently was experiencing some of the same issues as you, and the manual said to check compression before doing anything. I didn't follow that advice until 3 hours later. Turns out the reason my #3 cylinder was missing on idle, was due to a large CHUNK out of the side. Purchase a compression gage at any auto parts store, it only takes a few minutes to save tons of time in troubleshooting. If compression is good, you should go with something like Sea Foam or Merc CLeaner...spary throughly and then run the heck out of it to clean it out.
 
M

MELL

Recruit
Joined
Jul 15, 2003
Messages
2
Re: 95' 120HP FORCE FOULING #1 PLUG

Thank you both for the quick replies! I will try both ways and let you know how it turned out.
 
9

9675hpforce

Petty Officer 3rd Class
Joined
Jan 26, 2003
Messages
98
Re: 95' 120HP FORCE FOULING #1 PLUG

i switched to autolight plugs they seem to have more electrod and less fouling over the champions. Dont follow the manual
 
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