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Hello all, new to the forum here. Im having some trouble that I hope someone here can add some info.
I have a 1998 Johnson 20hp and I am having issue with it overheating and cant seem to find the problem. I take my boat out and can run it for around 5-10 minutes fine. After that the motor starts to stutter whenever I get past 30%-40% throttle, as if its getting and cutting the power very quickly. I narrowed down the problem by cutting the wire to the overheating sensor which resulted it in running normal (I only ran it 20-30 seconds just to verify the problem). The tell tale is flowing normal and since then I have removed the head and exhaust covers and cant find anythings that would be blocking the flow of water. It has a new impeller, water pump, power pack, all new gaskets, stator, temp sensor, thermostat (tested since and works). So I'm at a road block as to what could be the problem.
I have a 1998 Johnson 20hp and I am having issue with it overheating and cant seem to find the problem. I take my boat out and can run it for around 5-10 minutes fine. After that the motor starts to stutter whenever I get past 30%-40% throttle, as if its getting and cutting the power very quickly. I narrowed down the problem by cutting the wire to the overheating sensor which resulted it in running normal (I only ran it 20-30 seconds just to verify the problem). The tell tale is flowing normal and since then I have removed the head and exhaust covers and cant find anythings that would be blocking the flow of water. It has a new impeller, water pump, power pack, all new gaskets, stator, temp sensor, thermostat (tested since and works). So I'm at a road block as to what could be the problem.
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