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I have 1986 115hp Yamaha. I took my boat out the other day and it ran perfect
all day until i was idling back to the dock. I noticed it was running rough, I tried
to give it gas but it kept stalling. once I got back to the dock I checked for spark and all cylinders checked out fine. I checked the compression and found out they all had 120psi in all cylinders except the bottom port cylinder had 100psi. Also when I was changing the plugs I noticed that the top starboard plug was dry.(the other three cylinders were normal-even the low compression one).Are these two problems related? any detailed info on the low compression cylinder and the dry cylinder would helpful.
Thanks.
all day until i was idling back to the dock. I noticed it was running rough, I tried
to give it gas but it kept stalling. once I got back to the dock I checked for spark and all cylinders checked out fine. I checked the compression and found out they all had 120psi in all cylinders except the bottom port cylinder had 100psi. Also when I was changing the plugs I noticed that the top starboard plug was dry.(the other three cylinders were normal-even the low compression one).Are these two problems related? any detailed info on the low compression cylinder and the dry cylinder would helpful.
Thanks.
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