Super Jet Ski overheats from too much flow through cooling

Rob O Flavin

Rob O Flavin

Location
Roanoke
Got an 08 rn superjet this spring. Needed a little work to get ready. Specifically mounts and carb cleaning. New to jetskis, so I took it to marina to have work done. When I got it back, I noticed pisser hose was disconnected. I contacted marina and was told it overheated with pisser and so they disconnected and didn't overheat. Mechanic said he only ran it through hose, or flush kit because nobody knew how to ride a standup to test it. I've looked at some cooling diagrams to try and figure out how I should hook it back up. Should I? Ive rode the ski a few times and it seems to work fine, but afraid to ride too long at any given time. Anyone ever heard of this? Could it be cooled another way? Where would the water be going if not out the pisser? maybe out the back? Thanks for all input. I'm learning, but still a noob.
 
mthomps

mthomps

Location
Cleveland
The pressure of the pump sends water through the motor more rapidly. cooling it quicker because it's under a load. On a hose it's much slower. By eliminating your pisser they leave incoming water in the circut longer. You can't tune on the trailer.

Best case scenario they did you right on the carb clean and the engine is aligned. (Assuming you meant motor mounts)

Maybe that's wrong info, but that's how I see it; someone correct me if wrong. Still, I'd hook the pisser back up. If you don't know how to wrench on a superjet you're about to learn
 
M

mikesx

If the cooling jacket is packed with weeds/grass you may see plenty of water coming out but it's not cooling. My crew rides the marshes, seen cylinder cooling jackets that look like a birds nest.
 
Rob O Flavin

Rob O Flavin

Location
Roanoke
mikesx said:
If the cooling jacket is packed with weeds/grass you may see plenty of water coming out but it's not cooling. My crew rides the marshes, seen cylinder cooling jackets that look like a birds nest.
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Lol... I guess the birds get hot too! Seriously though, thanks for replying. I got a lot to learn about ski
 
Rob O Flavin

Rob O Flavin

Location
Roanoke
JC-SuperJet said:
Sloppy Mechanic...

All the Cooling Water is now going thru the Exhaust System into the Waterbox and out the Rear Exhaust Outlet.

This is too much water going into the Waterbox and will reduce performance.

Needs an Overboard Bypass (Pissser) Outlet to reduce the amount of Water going into the Waterbox.

The Stock SuperJet Engines come with a Thermo Switch that will rev down the Engine to save it in case of Over Heating. It's mounted on the Cylinder Head.

Re-connect the Bypass and go ride it. Can rev it on the SUBMERGED Trailer first to see if it overheats.

If it does, find the blockage in the Cooling System. There is only one Cooling Supply Line coming from the Pump into the Exhaust Manifold.
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I guess I need to get a hose splitter, or a T valve to replace what was removed. Am I correct when saying, it had to have been removed for him to reroute water and not have it pouring into engine bay by just simply pulling hose off of splitter? Is it a T for half inch hose? Thanks for help.
 
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