GTS runnin' REAL HOT. Help!

[IDoSeaDoo]

So I feel that my poor little 587 is cooking itself. The only mods I've done is put on a west coast pipe and add a K&N flame arrestor. I rejetted it with 65low and 152high with pop-off in the mid 30's. I put stock cooling inlet nipples on the exhaust manifold and pulled off the main inlet hose and main outlet hose and made sure both are passing water. I get a full stream from both, so I don't think it's a clog. I plugged the stinger inlet on the pipe and ran the hoses like the stock diagram (to the pee holes in the back). Both spurt water, though one a little stronger than the other.

The plugs look like I'm running rich, though the PTO is a bit darker than the MAG. Weird as it's a single carb system... Anyway, the real problem I'm worried about it that it's overheating. When I take it for a good cruise at 60-100% throttle, upon stopping and opening the hood, the engine will click and tick like an overheated exhaust on a car. One time I even heard the overheat buzzer kick on. I have no clue why this would be as I seem to be getting good water flow through the motor. The exhaust pipe runs cool, but the sides of the engine you can barely touch. The head may be a bit cooler (I think). It never sizzles when I spit on it, so I guess it's not above boiling, but I'm still concerned... I almost feel like I"m running a 657 setup on a 587 cooling system... How can I lower my engine temps? Any suggestions on the plug color differences?

 

[IDoSeaDoo]

Well, I ran the GTS all weekend and it starts/runs fine, before and after warm up. I'm starting to think that there may NOT be a problem. However, the one thing that still puzzles me is the ticking sound when I shut it off after running it. Is that normal for 587? My 787 doesn't do it, but also gets damn hot to where you can barely touch the jugs...

 

[LouDoo]

I'll bet the ticking sound is coming from the west coast pipe.

Lou

 

[IDoSeaDoo]

Hmmm.... I'll def. check next time, but I recall the pipe being just warm to the touch. I THINK the rest of it is always cooler than the engine.

 

[Seadoobuddy]

I know there is a joke here about her getting hot touching jugs but i won't say it.

 

[IDoSeaDoo]

I know there is a joke here about her getting hot touching jugs but i won't say it.

lol where is the "Like" button?

 

[Sportster-2001-951C-Stock]

I didn't realize those engines ran so hot you couldn't keep your hand on them, I don't think my 951 runs quite that hot.

 

[IDoSeaDoo]

So I'm back to working on the GTS again. It gave up a crank last year, probably because of this damn overheating issue. So now I have it back together, but it's still running HOT. I did a lot of research on this cooling system, and found that my west coast pipe had a crack inside. It was dumping a little bit of water into the exhaust stream, but I don't think that's the primary cause of why it was running so hot. Did you guys know that those engines had a water discharge fitting right at the bottom of the exhaust manifold (before it even gets to the motor)? That fitting is actually larger than the orifice diameter of the main outlet fitting that screws into the exhaust thru-hull pipe. So half of the cooling water is discharged before it even has a chance to cool the engine. Then the water that DOES go to cool the motor is restricted by that stupid tiny orifice. Also, a TON of water gets sent to the exhaust stream when it branches off of the main feed line, way more than I think is necessary. So by design, you have a cool-to-the-touch exhaust pipe and an engine reaching temps of 150-180degF ON THE OUTSIDE. WTF were they smoking up there in Austria back in the 90's?? Running at idle on the hose, this engine heats up to 110 on one side and 130 on the other. My 787 stays cool while on the hose... On the lake last weekend, you couldn't touch it after a mid-throttle run. The whole engine bay was hot...

Oh and that's another thing, my MAG cylinder runs 20F hotter for some reason. I pressure tested the engine TWICE and found no leaks, plugs are the same, compression on the MAG is a tad lower (5-10psi). It's a single carb unit, so I really can't figure out why it's doing this... I took it back to bare bone stock, but opened the high needle 1 turn so it could actually spool up to the rev limiter and not back-fire at WOT (on trailer). If anyone has any clue to why they put a discharge fitting on the intake mani or why it's running so hot, PLEASE drop me a bone. I'm pretty much out of ideas at this point.

 

[RodInEscondido]

I am not experienced enough to know what the mods would do for cooling, but in my research and popping the top on several 580s (89, 90, 91, 94) I have discovered:

The orifices in the various fittings are noted to be specific and different for almost each of them. If used in salt water they will get crudded up.

I have found enough sand build-up in the cooling jackets (as well as small water leak evidence in the head seals) that I will probably mark it as a scheduled maintenance item to pop the head, clean out the water jacket and replace the seals; just gotta figure out what is the maintenance interval.

Hope this helps

Rod

 

[IDoSeaDoo]

Hey guys. I know this is an old thread, but here's a related question:

How hot should a 2-stroke seadoo engine run? I'm pretty sure seadoo designed them to all run at about the same temp (given the same lake temp), regardless of HP. Yesterday I went to the lake and the water temps are probably in the low 50's. After running it for an hour, and letting it sit a few min, I could barely hold my hand on the engine. This sucker runs HOT. I've brought it back to stock, and there are no clogged fittings anywhere. Everything seems to be flowing well. How long should I be able to hold my hand on it when it's fully warmed up?

 

[AdamXP800]

They get a lot hotter after shutting them off. Feel the engine temp while running



96 XP800!
Keep the 2 strokes alive!

 

[Seadoobuddy]

They get a lot hotter after getting them off. Feel the jugs temp while running

maybe that's the joke .....mentioned above.....OK, Ok so I changed it a bit.

 

[Krispy]

Hey guys. I know this is an old thread, but here's a related question:

How hot should a 2-stroke seadoo engine run? I'm pretty sure seadoo designed them to all run at about the same temp (given the same lake temp), regardless of HP. Yesterday I went to the lake and the water temps are probably in the low 50's. After running it for an hour, and letting it sit a few min, I could barely hold my hand on the engine. This sucker runs HOT. I've brought it back to stock, and there are no clogged fittings anywhere. Everything seems to be flowing well. How long should I be able to hold my hand on it when it's fully warmed up?

Here is a thread I made a while back about monitoring engine temp on the 787, I would be interested to see how your temps compare with mine. I have been very pleased with my TTO temp gauge under the spark plug. Gives me a nice piece of mind.

Have a look.

http://www.seadooforum.com/showthre...787-Discussion-with-temperature-data-included

 

[IDoSeaDoo]

Yea, I believe this puppy gets hotter than 166, but I'm checking with a hand-held infrared thermometer. I believe I saw them at 180F last year, but I'll have to check again this year. What were the ambient air and water temps when you were checking yours?