balikbayan
New member
"Hi Everyone,
I have had prob
"Hi Everyone,
I have had problems with my Tohatsu 9.9 for a while. Lately it has run great when idling and not running at all when I rev it up a little with the gear in. It sounds like a fuel problem, but today it ran quite good when I reved it up too. When I took away the thermostat it ran even better. What is the thermostat doing in the cooling system? As far as I can see it only open up an extra cooling pipe through the cylinder head, am I right? I got much better flow of water from the engine too with the thermostat away from the engine. I do believe that it is time to change the impeller.
I had the carburettor away today and looked inside it if I could see if there where any dirt in there, but it was very clean and nice. I opened up the fuel pump too. The membrane seemed to have a very small "pocket" in the rear part of it. Should there be that kind of thing. It looked like it had became a little too big. I ran the engine for a while after I had mounted the carburettor and it ran good then too, but it felt like it was trying to die for me once or twice, but I pumped on the hand pump on the fuel hose about 5 times and then it ran great again.
Is the hand pump on the hose supposed to be hard when driving the engine or will it be soft? I have had outboard engines too long time to ask that, but I have not felt at the hand pump when driving the engine before.
Thank you for your time to read this thread and the answers I do hope you will give me."
I have had prob
"Hi Everyone,
I have had problems with my Tohatsu 9.9 for a while. Lately it has run great when idling and not running at all when I rev it up a little with the gear in. It sounds like a fuel problem, but today it ran quite good when I reved it up too. When I took away the thermostat it ran even better. What is the thermostat doing in the cooling system? As far as I can see it only open up an extra cooling pipe through the cylinder head, am I right? I got much better flow of water from the engine too with the thermostat away from the engine. I do believe that it is time to change the impeller.
I had the carburettor away today and looked inside it if I could see if there where any dirt in there, but it was very clean and nice. I opened up the fuel pump too. The membrane seemed to have a very small "pocket" in the rear part of it. Should there be that kind of thing. It looked like it had became a little too big. I ran the engine for a while after I had mounted the carburettor and it ran good then too, but it felt like it was trying to die for me once or twice, but I pumped on the hand pump on the fuel hose about 5 times and then it ran great again.
Is the hand pump on the hose supposed to be hard when driving the engine or will it be soft? I have had outboard engines too long time to ask that, but I have not felt at the hand pump when driving the engine before.
Thank you for your time to read this thread and the answers I do hope you will give me."