Sporatic Engine Power

[Aqua Chalet]

1984 115 hp Johnson outboard TLCRD

Engine ran fine, I hit a rock and chewed up the 4 blade alum prop. Made it back to home and put old 3 blade alum prop on

Engine went from running fine on lake next day(45 minutes) to reduced power without touching throttle. Engine seemed to slowly reduce in power until I throttle back and reapply. Engine power would reduce then jump back up for a while. Next day, Engine difficult to start unless choke all the way.
Low power with throttle at 3/4 then without touching throttle the engine would power up suddenly then seconds later power down without touching throttle.
​I later discovered I was putting too much oil in gas- closer to 40: 1 ratio than 50:1.
Its a VRO fuel pump and I just plugged the oil outlet and mix the gas.
Is it possible too much oil caused this.
Engine completely rebuilt except alternator and regulator.
Fuel pump and hoses are new a year ago. Old Fuel pump still worked but leaked around gasket.

 

[flyingscott]

I doubt the pump was the problem. What kind of clamps did you use on the fuel lines sounds like air in the system.

 

[ondarvr]

Oil ratio won't do it.

Don't run it like that, if it's carburetor issue you could destroy the motor. It's either running lean from a plugged carb, or possibly a coil is failing at high RPMs. Check for spark when it's acting up, use a timing light or an inline spark test light on each plug to see if there's a problem.

 

[emdsapmgr]

Good idea to check the ignition components on the engine. They can tend to work/not work-similar to your problem. This website has some xcellent troubleshooting info for your engine: cdielectronics.com. Better than the factory manual on these early models.