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Any ideas?

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Come on guys. I'll pull the heads and take some pictures for you if that helps anyone who can read a piston. Although the plugs were gapped at .030 gapped at .025 now. Seems to have good compression because it starts up perfect and runs fine for a couple seconds. Just curious about where the waters going if its not coming out the pisser from the exhaust manifold.
 
You are on right track, although weak j-pump venturi pressure from too much wear ring tolerance could be culprit.
Your BR8ES *plugs should be gapped .022 for your 657X engine.
 
Did you read the procedure in the manual? Does it tell you pinch any lines while flushing? If so, the garden hose will never reach the same pressure as the jet pump does. I'm not certain if that pertains to your ski or not but I know it does for a 787 powered ski.
 
Good pointer. But my problem is the same on the water too. Changed out fuel lines like I've said but can't get one dang stripped allen head out of the carb or I'd pull it and change the line in between them and clean out the filter and jets. Like I said also the thing ran fine a week ago and I took it home greased up the zerks on the driveshaft, changed plugs, and tightened a loose connection on battery neg terminal. Put her on the water and she'd idle and just die. I wouldn't even really say it bogged down at all just cut out after a couple beeps from the heat sensor. May pull the internal heat sensor out and clean it to while I'm at it. After all of this I've felt the engine and its never been hot enough to not be able to hold my hand on the top or sides of the block. So its very weird and could be just about anything... I'm just praying it aint electrical. Thats about the worst problem on any engine for me. Computers should never been put in em in my opinion haha.
 
First of if you want it to survive you need to get the carbs off and go thru it. Do you ride in fresh or salt water, I can't tell where you're located other than the US of A . That doesn't give us much to go on. Have you blown compressed air thru the pisser line, just a few psi. You need to verify all the cooling lines are clear.
 
Fresh water is all its ever seen so there is no need to backwash after every ride but its a river so it can be muddy sometimes. Whats the best way to remove a stuck allen bolt? Wish the dang things had hex heads on em. Makes life much easier.
 
Going to oreillys after work to pick up a compression gauge on loan a tool to save me from pulling head off engine. Hopefully that rules out a major problem. Though the previous owner did have an "amateur" mechanic rebuild the top end last summer so I'm in high hopes it reads over 100 and is pretty even.
 
47.jpg
left plug is from pto cylinder right plug is mag. Mag cylinder has liquid in the threads and and pto plug has more on the electrode. Brand new plugs.
 
Also something else that may be of importance the first time with temp sense on it just shut off the second time with temp sense off block it gave me two beeps then shut off. Were these designed with some kind of limp mode when a fault is detected? Sighhhhh
 
Water flow restriction? Blow air thru the cooling lines. The fittings could have corrosion or blockages. You really need to just dig into it and do one thing/fitting at a time. Remove then and look at them. It's a pain in the ass but it's troubleshooting the problem. Could also be the temp sensor is bad. There is a procedure in the service manual on testing it if I remember correctly.
 
Its not water system blockage both pissers are working fine now I had to clamp the one hose with some channel locks and all is well.
 
But you said the temp sensor wouldn't kill the engine so it has to be something fuel delivery as long as the cylinder compression checks out tomorrow. Anyone know how to remove stripped allen bolt from a delicate piece like a carb?
 
So, when you run the ski on the hose you run the flow backwards. It goes directly into the cylinders to cool them. When you run it off the pump in the river/lake the flow is different and the cylinders are cooled from the pump, there could be a restriction in the pump, the line from the pump, corrosion in the inlet of the head. If I remember, you said in the water the pissers didn't flow much, right? If you're not pushing the water thru fast enough it will/can over heat.
 
Its not that it doesn't flow fast enough in water its more like I couldn't get the thing passed idle to really notice if it picked up when i put more water through it. It runs on the hose like it runs on the water starts up idles fine for a few seconds and then shuts off and sometimes gives the engine heat sensor beep. I think my problem is either fuel delivery via the dual carbs or it could also be electrical through the magneto. After I got the ski (when it did run fine) i washed it down and did some cleaning of oil off the block and such but i didn't spray anything internal directly with the hose for I have washed car engines before and had them run like utter crap for a couple days because water found its way into places it shouldn't have been. But i don't know anymore I'm just lost. If I could get the damn carb off I could probably solve it.
 
Guys if you would please watch and listen to the first video. To me it sounds like the motor and exhaust are very sound and run really smooth but it just dies out of nowhere. No bogging or anything. If i feed it throttle it dies almost instantly. Whats your best guess? Carbs? If so if anybody has dealt with a stuck allen bolt how the heck did you get it off?
 
When at last resort, drill a small hole exactly in center, go 1/32" larger until you get almost to the drill size for tapping the enitial screw, but use a left hand twist drill and it probly will unthread the barrel you made. If not,
you can use an awl to pick out the threads from the base.
 
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