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Author Topic:   Fouled Spark plug 1991 90 Force outboard

6992WHALER posted 08-20-2012 10:36 PM ET (US)
I put the 1966 Sakonnet in the water yesterday for the first time since May. It had been out of commission with a failed drain tube. The 1991 90 Force Outboard only had 4 hours on it this spring after being winterized before I pulled it out for the repair.
Yesterday the engine ran rough and would max out at only 23 MPH. I guessed it was running on only two cylinders.
I did not do anything to the engine when I stopped using it in May so it was possible that it was a fuel issue or residual winterizing oil problem.
I stopped at the local auto parts store to grab plugs. After 30 minutes of the two kids searching the shelves, I gave up and left empty handed.
I went back to the boat latter that day and a friend of mine was there I told him what I suspected and he said did you feel for the cold cylinder. I said no, I had never even thought about that. So he had me pop off the cowling and he put his hand by each plug and he said the middle cylinder is cold.
We pulled the plug cleaned it up and reinstalled it. The engine fired up and ran great.
In this situation that sure was a simple way to figure out the dead cylinder.

skred posted 08-21-2012 03:13 PM ET (US)
I had a 1991 Force 90 on my '92 Montauk and ran it for the 4+ years I owned it without a single hitch. I did-however - change the plugs every 2 years. As far as I know the now-owner of that boat is still running it with the Force 90, 12 years later. Despite prejudices, that motor was bulletproof. Regular, detailed maintenance is the secret.
newt posted 08-21-2012 04:35 PM ET (US)
Great idea to feel for the cold cylinder. Also, don't you wish all outboard motor fixes were as simple as a new spark plug?
6992WHALER posted 08-21-2012 05:34 PM ET (US)
I agree with the change the plugs every 2 years or less idea.
I like to change them in the spring after I have run the engine enough to burn out the winterizing oil. They were on the list for replacing this summer but I figured with the boat going in on August 20 that the plugs would wait until next summer.
I have three new plugs in the truck, I will stick them in next time I am on the boat.
I also agree, my 1991 90 Force has payed for itself many times. Only stranded me once when the starter failed. (Ya I could have pulled started it, maybe?)
6992WHALER posted 08-21-2012 05:38 PM ET (US)
I must like making up words, payed sounds like paid
Binkster posted 08-21-2012 08:01 PM ET (US)
I kove Chrysler/Force outboards. Very simple to work on and won't let you down if maintained. I had a '69 Chrysler 105 Chrysler race engine on my 14' Desilva class F race boat. It would run over 70 at 6000rpm. I would like to find a 70hp fresh water low hour Force for my 15 footer.
I think they got a bad reputation as most were sold on Bayliners with no boating experience and weren't maintained. There cheap to buy too becuase of that reputation.
I think payed is a word, in the South, I heard Southerners drag out paid so it sounds like payed.
rich

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Author	Topic: Fouled Spark plug 1991 90 Force outboard
6992WHALER	posted 08-20-2012 10:36 PM ET (US) I put the 1966 Sakonnet in the water yesterday for the first time since May. It had been out of commission with a failed drain tube. The 1991 90 Force Outboard only had 4 hours on it this spring after being winterized before I pulled it out for the repair. Yesterday the engine ran rough and would max out at only 23 MPH. I guessed it was running on only two cylinders. I did not do anything to the engine when I stopped using it in May so it was possible that it was a fuel issue or residual winterizing oil problem. I stopped at the local auto parts store to grab plugs. After 30 minutes of the two kids searching the shelves, I gave up and left empty handed. I went back to the boat latter that day and a friend of mine was there I told him what I suspected and he said did you feel for the cold cylinder. I said no, I had never even thought about that. So he had me pop off the cowling and he put his hand by each plug and he said the middle cylinder is cold. We pulled the plug cleaned it up and reinstalled it. The engine fired up and ran great. In this situation that sure was a simple way to figure out the dead cylinder.
skred	posted 08-21-2012 03:13 PM ET (US) I had a 1991 Force 90 on my '92 Montauk and ran it for the 4+ years I owned it without a single hitch. I did-however - change the plugs every 2 years. As far as I know the now-owner of that boat is still running it with the Force 90, 12 years later. Despite prejudices, that motor was bulletproof. Regular, detailed maintenance is the secret.
newt	posted 08-21-2012 04:35 PM ET (US) Great idea to feel for the cold cylinder. Also, don't you wish all outboard motor fixes were as simple as a new spark plug?
6992WHALER	posted 08-21-2012 05:34 PM ET (US) I agree with the change the plugs every 2 years or less idea. I like to change them in the spring after I have run the engine enough to burn out the winterizing oil. They were on the list for replacing this summer but I figured with the boat going in on August 20 that the plugs would wait until next summer. I have three new plugs in the truck, I will stick them in next time I am on the boat. I also agree, my 1991 90 Force has payed for itself many times. Only stranded me once when the starter failed. (Ya I could have pulled started it, maybe?)
6992WHALER	posted 08-21-2012 05:38 PM ET (US) I must like making up words, payed sounds like paid
Binkster	posted 08-21-2012 08:01 PM ET (US) I kove Chrysler/Force outboards. Very simple to work on and won't let you down if maintained. I had a '69 Chrysler 105 Chrysler race engine on my 14' Desilva class F race boat. It would run over 70 at 6000rpm. I would like to find a 70hp fresh water low hour Force for my 15 footer. I think they got a bad reputation as most were sold on Bayliners with no boating experience and weren't maintained. There cheap to buy too becuase of that reputation. I think payed is a word, in the South, I heard Southerners drag out paid so it sounds like payed. rich