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New here, sorry to ask for help on my first post. I am having an overheating issue with my 1998 200hp Mercury outboard. It is a 200L (or V200 not sure?) with carbs and the SN is OG752293.
While running close to WOT, the RPM increased and shortly afterwards (20 seconds) it overheated. The motor was jacked and trimmed up a little higher than normal so thought that was the problem. Now it seems to maintain good water pressure & run normal temp at mid throttle but when close to WOT, at times we get the RPM increase again and then notice erratic water pressures (literally bouncing between 0 and 20psi) and overheating. Running in a tank, the water pressure at idle is good (2-5 psi) and the head temps are good (150F). Water pump, poppet and t-stats were replaced last year and we ran with no problems till now.
-My prop guy had to put some cup in the prop and advised it is pretty worn. Can a prop issue create a cavitation condition and cause the water pump to lose prime?
-What are the symptoms of poppet issues?
-Can poppet issues cause erratic water pressure?
While running close to WOT, the RPM increased and shortly afterwards (20 seconds) it overheated. The motor was jacked and trimmed up a little higher than normal so thought that was the problem. Now it seems to maintain good water pressure & run normal temp at mid throttle but when close to WOT, at times we get the RPM increase again and then notice erratic water pressures (literally bouncing between 0 and 20psi) and overheating. Running in a tank, the water pressure at idle is good (2-5 psi) and the head temps are good (150F). Water pump, poppet and t-stats were replaced last year and we ran with no problems till now.
-My prop guy had to put some cup in the prop and advised it is pretty worn. Can a prop issue create a cavitation condition and cause the water pump to lose prime?
-What are the symptoms of poppet issues?
-Can poppet issues cause erratic water pressure?
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