Evinrude top cylinder dead

[packfan1967]

I have a 48 hp evinrude with a dead top cylinder. Here is what I've done so far:<br />Plugs are good, plug wires are good, cleaned carbs but did not take apart, both coils are good, emptied and cleaned gas tank and lines. <br />Motor fires right up and the bottom cylinder runs fine.<br />Any thoughts?

 

[Fouled Plug]

Re: Evinrude top cylinder dead

What's the compression readings on this beast?

 

[Brew]

Re: Evinrude top cylinder dead

Assuming you have decent compression, I'd check the high speed jet on the carb feeding the dead cylinder. If something is blocking it, you'd lose the cylinder it was feeding.<br /><br />Good luck.

 

[Solittle]

Re: Evinrude top cylinder dead

What do you mean by the top cylinder is dead? Do you have fuel or spark?

 

[Rouse5369]

Re: Evinrude top cylinder dead

check the compression on top cylinder versus the other one,i had this on my johnson 115 last week ,i had a hole in the piston

 

[jdkzrt]

Re: Evinrude top cylinder dead

Rouse; have you found the reason for the piston burndown? (plugged main jet???)