Spark Plug Reading

[scatgo]

Can Someone tell me why those spark plugs with about 10 hours look the way they do?

 

[racerone]

The one on the bottom has an --" expensive look " to it.------What motor and what is the motor doing ?

 

[scatgo]

1980 johnson 35hp. The motor runs pretty damm good as long as you stay on it. If i let it idle for a while a few times it will start to bog down off the line and if I keep it at wot for a while it clears up and runs great and then I could go back to letting it idle again.

 

[Vic.S]

Carb flooding slightly ?

Idle mixture set too rich?

Choke not opening properly?

 

[jakedaawg]

Choke. Or too much prop

 

[scatgo]

I was thinking I am to rich but anybody know what the float bowl height should be? Choke is good. Can always work on the idle mixture but there is a special tool to set float height that I cant get my hands on.

 

[scatgo]

Prop is good according to shop manual specs.

 

[F_R]

Death rattle on the bottom one. Something terrible is going on in there. My first thought is water getting into cylinder. Second thought is a melting piston.

 

[scatgo]

Death rattle on the bottom one. Something terrible is going on in there. My first thought is water getting into cylinder. Second thought is a melting piston.

Can you be more specific when you say death rattle?

 

[scatgo]

I stuck a bore scope into my spark plug holes a while back. These are the pictures. The pictures are not that good but ill do it again next chance i get.

 

[scatgo]

Is the head gasket the only gasket that would let water into the cylinder?

 

[boobie]

Exhaust cover gaskets could be leaking.

 

[Faztbullet]

Check the cooling system especially the t-stat as plug are not reaching temp

 

[racerone]

Post #2 says ---Expensive.------Remove the cylinder head.----You will likely find scored cylinder and motor needs to be rebuilt !

 

[F_R]

Can you be more specific when you say death rattle?

Don't take the word rattle literally. I simply meant that it is about to self destruct, die, blow up, or however you want to word it.