Nissan 4hp 4stroke dies when cover on

Nissan 4 stroke

Recruit
Joined
Sep 16, 2010
Messages
1
Hello, I just bought a nissan model # NSF4A. Its a 4 stroke 4hp. It seemed to run well when I bought it but when it is ran for 10-15 minutes it boggs down and dies. But when working on it I found that it runs with the cover off with no problems.

On a side not it idles a little rough and seem like it wants to die at time and pops if I open the throttle too much. But there is a nice range in the middle where it is running well.

Any ideas? I have worked as a diesel mechanic but this is my first outboard.

Any help would be greatly appreciated.

Thanks
 

pvanv

Admiral
Joined
Apr 20, 2008
Messages
6,500
Re: Nissan 4hp 4stroke dies when cover on

Go through the carb.
 

philsboat

Cadet
Joined
May 5, 2010
Messages
17
Re: Nissan 4hp 4stroke dies when cover on

Make sure the engine compartment has an air supply.Every piston stroke pulls in a volume equal to the displacement.

Phil
 
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