I'm having a problem with spark plug fouling.
My first indication of a problem was the engine would start running roughly after about 30 minutes or so. I checked and cleaned the spark plugs at that time. They were some what black, but not grossly. A little research told me the fouling could be caused by exhaust back pressure, which could be caused by a collapsed exhaust hose. I replaced the hose and cut up the old one finding no damage (after 40+ years of use). Everything ran just fine.
Last year I replaced the carburetor as the old one started leaking gasoline. At that time I replaced the spark plugs gapped at .035. The new carburetor did not have an adjustable main port and soon there after I experienced the stalling and shut down. So I ordered an adjustable main port for the carburetor and cleaned the spark plugs. I think I have the carb set just right easy going, not too rich.
This past Monday I was motoring down the ICW, had gone about 8 miles and the stalling happened again. When the engine died, I put out the jib and sailed the remaining 12 miles back to the marina, which was quite nice. As I entered the marina I attempted to start the engine to no avail, so everything else was by sail.
Yesterday I put in new spark plugs and the engine started on the first go.
So now I have new plugs, new adjustable main port and an almost new carburetor, not to mention an almost new exhaust hose.
Anybody have a good idea of what is going on and how to proceed from here?
My first indication of a problem was the engine would start running roughly after about 30 minutes or so. I checked and cleaned the spark plugs at that time. They were some what black, but not grossly. A little research told me the fouling could be caused by exhaust back pressure, which could be caused by a collapsed exhaust hose. I replaced the hose and cut up the old one finding no damage (after 40+ years of use). Everything ran just fine.
Last year I replaced the carburetor as the old one started leaking gasoline. At that time I replaced the spark plugs gapped at .035. The new carburetor did not have an adjustable main port and soon there after I experienced the stalling and shut down. So I ordered an adjustable main port for the carburetor and cleaned the spark plugs. I think I have the carb set just right easy going, not too rich.
This past Monday I was motoring down the ICW, had gone about 8 miles and the stalling happened again. When the engine died, I put out the jib and sailed the remaining 12 miles back to the marina, which was quite nice. As I entered the marina I attempted to start the engine to no avail, so everything else was by sail.
Yesterday I put in new spark plugs and the engine started on the first go.
So now I have new plugs, new adjustable main port and an almost new carburetor, not to mention an almost new exhaust hose.
Anybody have a good idea of what is going on and how to proceed from here?
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