Engine stop

[Mazda2010]

Hi everybody again another problem to fix. I was on water yesterday trying the boat after fixing a leak in my tuned pipe on port side after maybe 10 minute engine on starboard was running a little bit rough so i stall it and never manage to start it back. At beginning it didnt turn at all and was stalling my other engine when i try to start it. When i try to start it while port side is stop it turn but make weird noise and it look like thers no fire. Do you think its only a fouled plug, water in engine or worse need top end job. I will fix it for sure but looking for some advice.

 

[Dr Honda]

I would start with plugs... but you can't rule out anything. The only way to know if you need a top-end, is to check the compression. 150 psi is perfect... and anything able 135 should run OK.

 

[Mazda2010]

Ok so i pulled out the plug and found out some melt metal on one of the plug. Engine turn and start with new plug but knock as crazy so ive turn it off right away. I will probably need to open to see what cause melt metal on plug but before i will check compression to see if its top end or something else can it be the rave valve hit the piston ???

Heres some pics of the plugs ive pull from the engine.