Speedster overheating

[Gary pope]

Overheating
I have a 95 sea doo speedster in which I just got done taking her out for the first time since I got her. Here's what I know. It started up fine in the driveway before we took her out. Got her out in the middle of the lake and I noticed there to be a buzzer going off. I now assume it was a overheating buzzer going off because after we hit her home she started up fine with no knocking. While out in the middle of the lake when It was overheating, I'm assuming, I did notice when I got it to start that it was making a knocking noise and sounded real rough. I guess my question is, where should I begin to start to look?

 

[Lumps]

it is possible that your cooling loop is clogged. when I got my previous one it was plugged. if I remember correctly there is a clear piece of tube at the very end of the loop. I can't remember but I think you are not supposed to run the hose without the engine running on the seadoo style engines. The way I found out mine was plugged was the green antifreeze didn't show in the clear tube like it was supposed to at the end of the season.

 

[Gary pope]

If you're talking about the clear hose going from the bottom of the exhaust elbow to the back of the boat, I don't think it's plugged then because I also found out that that hose had a hole in it and water was entering the engine compartment so I had to fix that too

 

[Gary pope]

Besides if I recall when the buzzer started going off in the motors quit I thought the motors and they didn't seem all that hot you could touch the exhaust and keep your hand there for a second or two

 

[Gary pope]

I also found out the hard way that my scupper valve at the back of the boat is bad. I noticed that there was water backing up at our feet...where can I get one of these?

 

[Lumps]

Are both of you engines effected at the same time? The cooling is independent so unless both are plugged maybe it's something else. When mine was plugged it was before the clear section. Right where the tube exited the engine.

A lot of the parts on these boats are generic parts still sold by the company that made them originally. You should be able to find one on Amazon for instance. Before you try to replace it though check for junk and leaves etc. I don't know what else can go wrong with these unless it's physically broken or missing the ball etc

 

[Gary pope]

Lol. We'll all I know is while cruising across the lake it wide open throttle I started noticing the buzzer going off, at which point shortly there after the engines decreased power I'd say about 50% and would barely run so I brought her back home let it sit for a couple hours and it fired right up purred like a kitten. I had a guy tell me that maybe both of the water temperature sensors that are on top of the head between the spark plugs could be bad because like I said when I was floating in the lake the motors weren't all that hot they were cool to the touch so I don't think it's actually overheating due to lack of water. I've tried to find these temperature sensors and I can't seem to find one. Another question is, is there a way that I can hook up a temperature gauge to each motor to monitor the temperature?

 

[Gary pope]

Isn't there a way of testing the sensors off of the motor?

 

[Lumps]

this is from the 98 speedster manual:

Monitoring beeper continuously
sounds
• Restricted jet pump water intake. • Check/clean.
• Cooling system restriction. • Check/flush, refer to section
02-03.
• Grounded temperature sensor or
sensor wire.
• Check/repair/replace.

Temperature
sensor activates
monitoring
beeper when
temperature
exceeds 96-99°C
(205-210°F).

but I was not able to find the resistance the sensor should have normally.

 

[Lumps]

I found this on the pwc portion of the site (don't know how to give the proper quotes):

"Good reply Greg. Here is a little more information to help out.To check the temp. sensor un plug it, and see if it still beeps. The sensor is designed to make contact inside the switch when it reaches 205*f. If its bad replace it. if you ground the connector on the temp switch it will also cause the beeper to beep.

Karl "

 

[Gary pope]

I just got done taking the heads off to check fir possible clogging. Everything is fine, no clogging. I hooked up the hose to each side, turned the hose on and water was easily making it through each motor because it was exiting through the transom ok. So now where should I look to?

 

[Lumps]

Here's what I was thinking. If the sensor is supposed to conduct at 96 degrees c. That is a hair less then boiling. If you stick the end in a pot and let it boil if it starts connecting with your multimeter before it boils you know it's too soon. I don't know what the sensor looks like or if you could do this without ruining it or not

 

[JoshuaDuncanCT]

There's a Telltale sign whether the motor is actually overheating if you can hold your hand on the exhaust at idle with the water running then the motor is not overheating and it's the sensor if you cannot hold your hand on the exhaust manifold directly against the head there is a clog in the pump filter

 

[Gary pope]

Is it possible if the sensors are bad then it will somehow think it's overheating and go into a limp mode, like its running on only half cylinders?

 

[Gary pope]

Ok here's what I just found out. I went out and noticed that tgere was puddles of oil under each motor after I cleaned the bilge. So I went to take parts off of the motors and found out that the idiot that I bought it from just slid the oil lines on and didn't secure them at all so I'm hoping that is the reason for my overheating problem. I won't know until I get them put back together and take it fof a test drive... to be continued.