Spark plugs in 100HP 4Cyl. 2Strk

[fgz]

Is there a good spark plug analysis chart for Merc or any 2stroke outboard engines?
What should they look like?

Thanks

 

[fgz]

Re: Spark plugs in 100HP 4Cyl. 2Strk

Is there a good spark plug analysis chart for Merc or any 2stroke outboard engines?
What should they look like?

Thanks

 

[Chris1956]

Re: Spark plugs in 100HP 4Cyl. 2Strk

There are lots of charts and pictures. What you want to see is all plugs look the same, with no water drops. Lite to medium brown ask and maybe some oil on the plugs. Blacker plugs are usually OK as well.

White/green color is overheat or lean mixture. Oil fouled is bad. Very clean like new plugs, are Steam cleaned due to water infiltration.

 

[fgz]

Re: Spark plugs in 100HP 4Cyl. 2Strk

Thank You for the help!