Motor shuts off at higher RPM. Gives warning alarm. Runs fine otherwise.

[amxfc3s]

I just purchased a 1990 70HP Evinrude motor and having an issue with it. It starts right up and runs fine at low RPM's but will shut off and give a constant warning/alarm tone when at higher RPM's (>3000 RPM). I believe the constant alarm tone is fuel related. When this happens, I shut the motor off, turn the power off, then turn the power back on and it fires right back up and runs fine again. So far I have changed the fuel line from the tank to the motor, the primer bulb, and the fuel filter. Does anyone have any other ideas? Thanks!

 

[emdsapmgr]

Re: Motor shuts off at higher RPM. Gives warning alarm. Runs fine otherwise.

Your owner's manual will indicate that a constant horn is an overheat warning-not fuel. Possible the engine is getting so hot that you are getting an overheat lockup.