701 cooling

[Nickdean22]

At the end of last season I picked up a 93 SN superjet with a 61x in it. (I put about 6 tanks of gas through it without any problems or overheating that I know of.) From what I have researched no other skis cooling seems to be similar (all go from pump to exhuast) and I just want to make sure it wont cause any problems.

Basically it goes like this

Pump --> head --> exhuast --> to pisser.
(Has the tiny line from head to end of pipe)

 

[Mike W]

I’m assuming you have a stock exhaust?

Even though you’re not having cooling issues, your routing is wrong. Should go from the pump - exhaust manifold - out the head - expansion chamber - then you can t for a pisser in the line from the head to the expansion chamber.

 

[mikidymac]

Exactly how I did my 91’ SN to 61X.
Pump to lower exhaust manifold underneath.
Then upper manifold to a tee, the tee goes to a new pisser then up to the head.
The little 1/8 fitting in the front of the head goes to the little fitting on the exhaust.

 

[Nickdean22]

I’m assuming you have a stock exhaust?

Even though you’re not having cooling issues, your routing is wrong. Should go from the pump - exhaust manifold - out the head - expansion chamber - then you can t for a pisser in the line from the head to the expansion chamber.

Yes Its still stock exhuast.
now the expansion chamber right now seems to have 2 hoses side by side that t together and ultimately go to some quick connect on the gas tank. My question is which one do I connect to on the expansion chamber.

 

[Nickdean22]

Here's what I'm talking about on the expansion chamber.

 

[mikidymac]

No that’s wrong.

The one with nothing on it should just have a capped flush hose for when you need to flush the salt water out.
The other one should go up to the head and a tee that goes to a pisser.

The one from the pump actually connects under the pipe and isn’t in your picture.

#18 Goes to the head.
#20 goes to the Tee
#21 is the pisser
#23 is from the pump.

 

[Nickdean22]

No that’s wrong.

The one with nothing on it should just have a capped flush hose for when you need to flush the salt water out.
The other one should go up to the head and a tee that goes to a pisser.

The one from the pump actually connects under the pipe and isn’t in your picture.

#18 Goes to the head.
#20 goes to the Tee
#21 is the pisser
#23 is from the pump.

I just took the hose off before i took the picture to see it. It was connected along with the other port to a T going to a quick connect fitting of some sort (in picture onto of tank). I'm going to have to re route the cooling before this season.

 

[Nickdean22]

I do have a dumb question. From the head to the expansion chamber, once the water gets to the port on the expansion chamber where does it go. (I assume into the exhuast) but does it have to travel up and around the chamber until it gets up top to enter the exhuast or what?

Also would there have been a reason the person who put the engine in ran the cooling backwards and with no expansion chamber cooling like this other than just not knowing the proper way?

And finally will re routing the cooling back to stock help with performance or anything like that?

Thanks for all of the help and dealing with a noob.

 

[Mike W]

Once the water exits the head into the chamber, the water goes through the exhaust, to the waterbox and out the exhaust pipe.

There are no performance gains putting it back to stock, it will just be cooling properly. One thing you can do is to install a 3/8” T fitting in the line going from the head, to the exhaust and run a line to a pisser to dump the excess water overboard. That will dry out the exhaust and give you a little better performance.

 

[Nickdean22]

Once the water exits the head into the chamber, the water goes through the exhaust, to the waterbox and out the exhaust pipe.

There are no performance gains putting it back to stock, it will just be cooling properly. One thing you can do is to install a 3/8” T fitting in the line going from the head, to the exhaust and run a line to a pisser to dump the excess water overboard. That will dry out the exhaust and give you a little better performance.

Alright thanks for all the information. Also for the 2 fittings on the exhuast chamber. (In a picture above) Can I just keep the existing t and have the line from the head go to both fittings on the expansion chamber (then just add another T for the pisser) I dont see any problems with doing that as I dont need to be able to flush it.

 

[Mike W]

Alright thanks for all the information. Also for the 2 fittings on the exhuast chamber. (In a picture above) Can I just keep the existing t and have the line from the head go to both fittings on the expansion chamber (then just add another T for the pisser) I dont see any problems with doing that as I dont need to be able to flush it.

I wouldn’t do that personally. Keep the flush kit just in case you need to run it out of the water. Or cap it off if you’re dead set on not having it.

 

[Nickdean22]

I wouldn’t do that personally. Keep the flush kit just in case you need to run it out of the water. Or cap it off if you’re dead set on not having it.

Alright do you have any idea what type of connector it is on top of the tank? (What I'll end up using for running out of water/seal it off when not in use.) Ur help is greatly appreciated. It's my first ski so I'm still learning what everything is technically called.

 

[Mike W]

Alright do you have any idea what type of connector it is on top of the tank? (What I'll end up using for running out of water/seal it off when not in use.) Ur help is greatly appreciated. It's my first ski so I'm still learning what everything is technically called.

No worries. Glad to help.

That connection on your tank is the flush kit. Just connect it back to the top fitting on the chamber or you can remove it, cut it down to about 12” and then connect it. That will clean up your engine bay a little. In the picture below is how it’s supposed to be.

 

[Nickdean22]

No worries. Glad to help.

That connection on your tank is the flush kit. Just connect it back to the top fitting on the chamber or you can remove it, cut it down to about 12” and then connect it. That will clean up your engine bay a little. In the picture below is how it’s supposed to be.

View attachment 391270

I definitely need to clean up the engine bay a little bit, didnt bother when I got it. Was to busy riding it (rode till early November in 50 degree weather then winterized it) I kinda like the location being on the tank and out of the way of the plugs so I'll see if I can tuck the line hidden away from sight. I'll have to find the female end for that connector. (Cpc brand not a standard garden hose w/ threads)