I have a problems with 2001 carbureted 60hp 4 stroke Mariner (Mercury). I spent a week fighting him and only last hope for your advice. I live in Spain and there is very little knowledge of the mechanics. My case is unique for them.
I just bought this boat. The previous owner rarely used it. The boat and motor can be seen that they are almost new. The last few years the boat was no use. The seller started the engine on the old fuel, but idle was unstable. Looks like the engine was running on three cylinders. We went out and the engine is not scored more than 4000 rpm. When we returned to port, the engine worked much better. I decided that the problem was in the old fuel, plugs, fuel filter and so on and bought this boat.
First, I examined the engine and replaced the fuel hose. The old hose was good on the outside but crumble from the inside. Then put in a temporary tank with professional fluid to clean the fuel system. Started the engine for the liquid and made it work several times for 5-7 minutes. Then left for a day with the liquid in the carburetor.
The next day I removed the carburetor with this liquid inside, brought it to a mechanic. He took it apart and thoroughly cleaned and washed. After that I put the carburetor in place, as well as put new plugs, new fuel filter and connect another tank with fresh fuel to engine.
I started the engine and it seemed to me that it works much better. In neutral I can spin it to 6000 rpm with no problems. I went to sea, and gave full throttle. 4200 rpm and that's all he can.
But that's not all. Now the fun part! This problem is only on the move forward! When I switch on the reverse gear in the sea, the engine spins up to 5700 rpm.
I thought the thing the throttle cable. Tried to give it gas by hand directly on the engine, but this is an extreme position of the dampers, then there is no place.
I checked all the spark plugs - they no soot, clean and bright.
I ran out of ideas what it could be. Especially the trick with 5700 rpm in reverse and 4200 on the front gear. I would be very grateful for any advice! Sorry for bad English.
I just bought this boat. The previous owner rarely used it. The boat and motor can be seen that they are almost new. The last few years the boat was no use. The seller started the engine on the old fuel, but idle was unstable. Looks like the engine was running on three cylinders. We went out and the engine is not scored more than 4000 rpm. When we returned to port, the engine worked much better. I decided that the problem was in the old fuel, plugs, fuel filter and so on and bought this boat.
First, I examined the engine and replaced the fuel hose. The old hose was good on the outside but crumble from the inside. Then put in a temporary tank with professional fluid to clean the fuel system. Started the engine for the liquid and made it work several times for 5-7 minutes. Then left for a day with the liquid in the carburetor.
The next day I removed the carburetor with this liquid inside, brought it to a mechanic. He took it apart and thoroughly cleaned and washed. After that I put the carburetor in place, as well as put new plugs, new fuel filter and connect another tank with fresh fuel to engine.
I started the engine and it seemed to me that it works much better. In neutral I can spin it to 6000 rpm with no problems. I went to sea, and gave full throttle. 4200 rpm and that's all he can.
But that's not all. Now the fun part! This problem is only on the move forward! When I switch on the reverse gear in the sea, the engine spins up to 5700 rpm.
I thought the thing the throttle cable. Tried to give it gas by hand directly on the engine, but this is an extreme position of the dampers, then there is no place.
I checked all the spark plugs - they no soot, clean and bright.
I ran out of ideas what it could be. Especially the trick with 5700 rpm in reverse and 4200 on the front gear. I would be very grateful for any advice! Sorry for bad English.
