94 b1, cooked engine HELP!!!!

I am new to the blaster world. and i am thinking it is not going well. I am stand up rider and taught my friend to ride, she loves it but thought a waverunner would be better....I talked her in to trying a blaster hoping to split the difference (knowing she would hate a couch) so, friend bought a blaster, she loves it!

We Rode it for probly 10 -15 hours.....was running when it left the water, she went to ride it the next weekend and started missing, back firing etc. come to find out the rear cylindar wasn't firing. so, changed plugs....no change, check boots and wire, Trim and replease do to minor corrosion with MSD caps.....no change, find that the rear wire was broken....replaced coil, MSD boots put in new plugs.....ran great for about 2 minutes. sputtered and died....took out rear plug.....to find metal slag caked to the plug :):):):)!!!!... Obviously the ring is cooked you can see it on top of the piston....has anyone ever has this happen with their blaster.....what did you do to fix...I have not taken the head off yet. i know i have to rebuild the top, hoping not the whole thing.

Have any of you had this happen? what the crap could have caused this? The ski has a protec pipe and bolt ons that is it. I recently pulled off the oil injection for fear of failure. Running it with the same 701 mix with amsoil as i use in my superjet. any suggestions welcome...:dunno:
 

waterfreak

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you got to pull the head off to see what happened. Gray matter on the plug is a definite piston failure .
 
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