top cyl fouling on 35 hp evinrude

[mrcrw009]

i have a 1976 35 hp evinrude and the top cyl is fouling and not running on it at all because when i pull the plug wire it does nothing and when i pull the bottom it dies instantly. So the compression is 120 psi on both cyl, the spark will jump an easy 1/4 inch on both cyl, the point gap is exactly .020 on both sets, swapped coils and spark plugs with no change. the spark plug comes out really clean so im prretty sure the gas is just cleaning it off. What is the purpose of the oil recirculation hose going from the intake to the top of the intake side of cyl. I took it lose and ran it thinking it might be flooding it out but nothing changed.

 

[Daviet]

Re: top cyl fouling on 35 hp evinrude

Does your fuel pump mount to the upper exhaust cover, is it leaking through the diaphram and flooding the upper cylinder.
The hose drains oil from the upper crank seal.

 

[mrcrw009]

Re: top cyl fouling on 35 hp evinrude

yes it does mount up there and i'm going to go check right now because i have a fishing trip in the morning so i want to get it figured out.

 

[mrcrw009]

Re: top cyl fouling on 35 hp evinrude

yep your right the gasket is torn right there on the diaphram and letting gas in there. thank you for your help now i just need to find a fuel pump or gasket.

 

[Daviet]

Re: top cyl fouling on 35 hp evinrude

Keep us informed on the outcome with a new pump.

 

[mrcrw009]

Re: top cyl fouling on 35 hp evinrude

well i fixed the pump with some permatex gasket maker for a quick fix and that fixed the problem. it is running great but it started making this noise that im not sure what it is. it sounds like metal contacting metal inside the engine itself, so it doesn't sound good. and its not constant it just happens randomly every 30 or 40 sec prob. the only thing i can think of is a crankshaft bearing roller sticking or something i don't know, its always something.