piston problem, 98' 90hp evenrude

[dansoph]

the electrode on one spark plug is mashed over.any idea why? thanks for any help dan

 

[tashasdaddy]

Re: piston problem, 98' 90hp evenrude

if your motor is a ficht, disregard this.

you should be using Champion plugs, 90* motor QL77JC4 or QL82C 60* QL78YC, people love to put other brands in these motors.

you need to take a flash light and check if the piston is damaged.

 

[dansoph]

Re: piston problem, 98' 90hp evenrude

thanks for your reply. i hope this isn't a dumb question, but how could the electrode get damaged? thanks dan

 

[Faztbullet]

Re: piston problem, 98' 90hp evenrude

I would pull the head and inspect the cylinder. This engine uses o-rings so dont worry about the a head gasket. If electrode is mashed something came thru cylinder to get on top of piston. It could have been a nut,screw or piece of piston skirt. Any strange noises before it happened or loss of power?