Waterman18 Posted March 14, 2020 Report Share Posted March 14, 2020 I have a 22 pathfinder with a Yamaha 250 show and jackplate , last two trips only at the end ,on the way back in when I punched it and jacked and trimmed it up a little it overheated.It’s turning about 5500 rpm and doing 50 mph Had boat for three years never had the issue before, could actually jack it up higher and no problem. It runs fine the whole day wondering why now when I accelerate and trim it does it? Quote Link to comment Share on other sites More sharing options...
FINCHASER Posted March 14, 2020 Report Share Posted March 14, 2020 Whens the last time the water pump and cooling system components (pressure control valve, thermostat etc) were checked? Have you checked the screens on the intake to make sure theres no blockage? Are you sure that "trimming" had anything to do with it? Maybe run it the same way without trimming and see if it OH's 1 Quote Link to comment Share on other sites More sharing options...
fishmanjj Posted March 14, 2020 Report Share Posted March 14, 2020 I agree with FINCHASER ......only I ask....how many hours ? How many sand bars ? 1 Quote Link to comment Share on other sites More sharing options...
FROZEN Posted March 14, 2020 Report Share Posted March 14, 2020 Do you have the ability to read water pressure? Did the overheat alarm sound and did the motor shut itself down? Quote Link to comment Share on other sites More sharing options...
Waterman18 Posted March 14, 2020 Author Report Share Posted March 14, 2020 Water pump replaced 100 or so hours ago, oil 50 hours. water pressure ga not working so can’t check. My alarm doesn’t work but motor does shut down. Checked pee hole and water was pretty hot so I am assuming it was overheated. Started back up fine , ran it trimmed down 1/4 mile no problem. I’ll remove screen and see if any debris is there. I’ve been able to jack this up and get up to 5800 and 54 mph with no problem before. I’m gonna take it back out Monday and some more testing. Quote Link to comment Share on other sites More sharing options...
HoneyB Posted March 14, 2020 Report Share Posted March 14, 2020 You are a brave man going to run your motor knowing it is running hot without a warning beeper. You are obviously starving for water. If the screen is clean you either need an impeller or you have thermostat issues. Personally I would be taking it to the shop not to run test. If it ran hot it will run hot again. Quote Link to comment Share on other sites More sharing options...
Waterman18 Posted March 15, 2020 Author Report Share Posted March 15, 2020 I ran 50 miles around the bay both trips running fine. Only did it whenI was coming in when I opened it up and jacked up a little. Seems like the nose cone is coming out of water somewhat but what’s confusing is that I’ve had it higher many times before with no issue. Quote Link to comment Share on other sites More sharing options...
Mad Beach Hewes Posted March 15, 2020 Report Share Posted March 15, 2020 Mine will do that as well when running full speed with the Jack plate up to high. I believe the tunnel creates an air pocket and the low water pick up does not get enough water. Do a search on the internet pretty common problem. Mine did it with only 25 hours several times. Alarm will sound way before anything happens. Mine never overheated. Quote Link to comment Share on other sites More sharing options...
Waterman18 Posted March 15, 2020 Author Report Share Posted March 15, 2020 A quick search found this topic in a previous post. Quote Link to comment Share on other sites More sharing options...
HoneyB Posted March 15, 2020 Report Share Posted March 15, 2020 If the op has run the boat for three years I would guess he is running the jack plate where he has in the past without issue. I could be wrong. I know one should not assume anything. Quote Link to comment Share on other sites More sharing options...
Bamaskeet Posted March 15, 2020 Report Share Posted March 15, 2020 Have you mounted a new transducer lately, which might disrupt water flow? Quote Link to comment Share on other sites More sharing options...
Headhunter Posted March 15, 2020 Report Share Posted March 15, 2020 had that with my 200SHO a couple of years ago. Changed the stats, fixed. I now change out the stats when I do the water pump. Quote Link to comment Share on other sites More sharing options...
smooth move Posted March 15, 2020 Report Share Posted March 15, 2020 does it have a poppet valve? could be hanging up or not opening soon enough. Quote Link to comment Share on other sites More sharing options...
jh141 Posted March 17, 2020 Report Share Posted March 17, 2020 No poppet on the four strokes. I like Headhunter had to replace my thermostats. Took them out and boiled some water on the grill side burner. One would open ok the other only half way. That caused overheat problems at trim and jack plate settings that were fine before. If I run full throttle and the jack plate is 4 inches up or higher it does not take long, maybe less that 5 minutes for it to go into limp mode and drop the rpm to under 2500. If your water pump has been replaced then check both thermostats. If they test good then you may just need to keep the jack plate below that setting at full throttle. I have found that my best speed and or efficiency comes when my jack plate is below 3 inches. I only run my motor up past 3.5 inches when i need to get through a shallow spot or find myself in a tight spot. Hope this Helps. Quote Link to comment Share on other sites More sharing options...
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