Overheating and Loud

It got louder because it sounds like there wasn't any water flowing through the exhaust system. Since it happened over a short period of time, I'd start by checking to see if you sucked something up into the raw water strainer. If clear then go to the raw water pump and see if the impeller is ok. You haven't been running this boat dry even for short brief times have you? Without water, it doesn't take much to burn up a impeller!

did set the idle without water after carb rebuild....will check...I sure hope that is the problem...don't want major problems...just got the boat

Will check impeller tonight, thought it was like a car motor, forgot about the raw water pick up.

WakeSlayer wrote: I could be off here, but do gekkos even have strainers? No one used to back in the day except CC. Realizing that "the day" may have been over by 1999, but still....

I think we may still be living in "the day". MC still doesnt install a strainer as standard equipment.

hey i would now check your impeller, take the water pump off and open it up, we had this problem and the impeller got melted and was hooped, so check that cause if there isnt enough impeller left it wont suck enough water and overheat and will be loud

well we took the water pump off in the winter time and it has no markings to show which way to put it back on and we put it on the wrong way lol, ya we know not to do that again, we put markings on it now though

took the front cover off the water pump and the impeller looks fine...all the rubber is there, I'll admit that it got hot when I set the carb running it dry, would it still look fine but not pump properly, the rubber getting too soft? Tried to take it out of its housing, do you need a special puller. Also took off the raw water intake at the pump and was able to blow threw it no problem. Going to hook up to garden hose this wkend and start seeing it it pumps. Took off thermostat housing...thermostat looks rusty, it also is one piece and couldn't get it out of the housing. My thinking is that even with a fbar thermostat it should still pump enough water not to give loud exhaust. Looked in the exhaust last night also, both side seem to be the same. When manifods pack it in do they cause a heating problem or just leak? Have no dealers in this area to even talk to....

hey, hook it up to water, disconnect to top water pump hose and see if water pumps through the pump

Don't use the garden hose to check flow through the pump. The pressure from the hose will give you a false indication of water flow. Stick the suction hose on the RWP into a bucket of water so it has to suck up the water. You shouldn't need a puller to get the impeller out. The rubber won't get soft but rather hard after overheating. Get a new impeller. You should not be able to blow through the pump.

Put a new impeller in, the one I took out looked perfect, however, the rubber had spun on the brass. Took the boat out and it would run anywhere from 160 up to 185. Should the temp stay exactly at say 170 or if a slight fluctuation normal? Wide open 4900rpm quiet exhaust!