I am in the process of understanding why my spark plugs are fouled and read the sticky from Don Moyer on preseason trouble shooting. In that post he talks about the problem of internal collapse of the exhaust hose creating back pressure in the exhaust system, thereby fouling the spark plugs.
Today I removed the exhaust hose running from the water lift muffler to the exhaust through hull fitting. First I inspected it for cracks or other malformation, the I ran water through it in both directions and the I did a tap test listening at one end for a different sound. I used the plastic handle of a small screwdriver as a mallet. I found no cracks or deformations, the water ran freely in both directions, and the tap test produced a uniform sound for the entire length and circumference of the hose. So, is this and adequate test of the hose's integrity?
Also, I checked the coil per Mr Moyers sticky, did a compression test on each cylinder and installed new spark plugs. I'm now installing the electronic ignition upgrade.
My last step is to drain the carburetor and that is a problem, none of the carb diagrams indicate where the main carb plug is located. I could assume that it is located at the bottom most point on the carb, but I cannot see there and don't trust what I am feeling. Can someone point me to a pictorial/graphic diagram that identifies the main carb plug?
I'm doing all of this as the last time I was sailing, I had an engine shut down and my trouble shooting led me to suspect an ignition issue.
Your help is appreciated
John
Today I removed the exhaust hose running from the water lift muffler to the exhaust through hull fitting. First I inspected it for cracks or other malformation, the I ran water through it in both directions and the I did a tap test listening at one end for a different sound. I used the plastic handle of a small screwdriver as a mallet. I found no cracks or deformations, the water ran freely in both directions, and the tap test produced a uniform sound for the entire length and circumference of the hose. So, is this and adequate test of the hose's integrity?
Also, I checked the coil per Mr Moyers sticky, did a compression test on each cylinder and installed new spark plugs. I'm now installing the electronic ignition upgrade.
My last step is to drain the carburetor and that is a problem, none of the carb diagrams indicate where the main carb plug is located. I could assume that it is located at the bottom most point on the carb, but I cannot see there and don't trust what I am feeling. Can someone point me to a pictorial/graphic diagram that identifies the main carb plug?
I'm doing all of this as the last time I was sailing, I had an engine shut down and my trouble shooting led me to suspect an ignition issue.
Your help is appreciated
John
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