1990 Evinrude 120

E

e.cook

Recruit
Joined
Apr 23, 2010
Messages
3
Having problems. Help would be appreciated.
Motor will run fine about 30mph 4000rpm try to go above and it misses and dies if I let off soon enough it will stay running about 4000.
Changed plugs, wires, rebuilt carbs drained fuel, replaced fuel filter, and lines.
 
J

jonesg

Admiral
Joined
Feb 22, 2008
Messages
7,174
Re: 1990 Evinrude 120

I would check the link and sync.
Make sure the throttle plates match up when its WOT ( full open).

It could also be starving for fuel at WOT, have you tried pumping the primer or choke when it starts to quit?
 
E

e.cook

Recruit
Joined
Apr 23, 2010
Messages
3
Re: 1990 Evinrude 120

Have not tried pumping the ball or choke while doing it. Does this motor have a fuel pump, what kind of pressure should I have.
 
J

jonesg

Admiral
Joined
Feb 22, 2008
Messages
7,174
Re: 1990 Evinrude 120

One sign of leaking head gasket is a steam cleaned piston and spark plug that looks brand new compared to the others.

A compression test will show it.

You mentioned a fuel filter, if its external to the engine bypass it for now, it could be impeding fuel flow. The only external filter recommended is a water seperator.

Hitting the choke or pumping the bulb will show whether its starving for fuel at 4K rpm.
 
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