Can I salvage this piston?

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97 GTX / Shuttle Craft
#1
Hey guys,

Any Chance of salvaging this piston? I was thinking of filling in the missing metal with JB weld and then finishing it off with a light sanding...
 

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97 GTX / Shuttle Craft
#3
Just what I thought, thanks. The rings have snapped in half as well, I'm thinking JB on that too.
 

mikidymac

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#4
I think you will make more horsepower by just replacing the entire piston and rings with a solid slug made from either JB weld or Epoxy Putty.
 
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#8
AKnarrowback, here’s the problem: Too much horse power. I’d hit the throttle and the grips would literally shoot out of my hands and I would somersault backwards off the jet ski. Just looking to fix this excess horse power issue, but I think once all the piston cavities are filled in, and the rings are JB welded back on it will fix the problem.
 

AKnarrowback

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#9
Filling in the cavities is going to raise the compression and get you more power, in theory.

I try to use a mix of silly putty with a handful of aluminum powder mixed in. It gives me the proper ratio at lower rpm's but compresses at higher rpm's giving me a variable compression system. The best of both worlds without the mess and headache of exhaust valves. I'm toying around with an ether fogging system, it involves a roll of duct tape, 12v solenoids, body armor, good medical insurance and a guaranteed 2 million views on you tube.


Er...... Scratch that last idea.... The wife said no..........
 
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#14
I'm making progress, thanks to everyone who's chimed in, it's been very helpful. I took heed of Aknarrowback's tip, and while I was fresh out of silly putty, plumbers putty seems to have done the trick to fill in all those gouges:

20190312_202311185_iOS.jpg
Here it is almost finished with the application process. I used green masking tape to hold the broken rings back together, I think it'll allow for proper expansion, and maybe provide some better sealing for extra compression. I'm a little worried about the tape scoring the cylinder walls, but sometimes you just gotta gamble, right?
 
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#15
The engine has 2 Cylinders & Pistons. Just leave it out and use the other one that's still in the engine. Most Seadoo Engines have 2 cylinder models so you when this happens you have a back up.....won't go as fast but hey.....in fact I would leave the head off, it will keep the engine cooler for you
 

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