The 75HP Mariner (1989) has 3 carbs and runs perfect once it has been in the water for a short period. To give a few more details, the engine will go weeks without being run. It will run on muffs and idles great. Put it in the water and throw the fuel to it and it runs but floods, getting only about 8 mph at full throttle. Back it back to a third throttle, it runs perfect. Bulb, hose and fuel filters as well as spark plugs have been replaced. Starts fine, idles fine. If you will run it for a few minutes, 5 - 10, at 1/3 throttle, shut it down, allow it to sit a few minutes, fire it up it will pick up and run like perfect getting around 42 mph at full throttle. Occasionally, after it runs at full trottle, it will develop the same reduced power, flooding smell issue. Once again, back off the trottle to 1/3, run it a few minutes, shut it down and it will once again run perfect possibly for the rest of the trip. It seldom develops the issue once it starts running correctly. This engine has never stranded me and it has always started fine.
I run seafoam in the fuel consistently and when this engine is running correctly, it could not be any better. When it shows out, you are limited to around 8 mph at 1/3 trottle, any more gas than that and you don't see any more performance.
I had a buddy that recently spent $500 getting a similar engine's carbs rebuilt and I don't know of a "good and reasonable" place locally to have this engine serviced. I have been putting up with this ever since I purchased the engine 4 years ago.
Any suggestions welcomed as I don't want to spend big money when it runs perfect most of the time. However I don't want to put up with this issue if it might be a cheap and easy fix. Since it has 3 carbs I hestitate to do anything more than remove the drain screws and spray cleaner into the drain hole which I have done. My thinking is something is sticking inside the carbs and when it frees up it runs perfect. Compression on the engine is 115 on all cyclinders.
Any help appreciated.
I run seafoam in the fuel consistently and when this engine is running correctly, it could not be any better. When it shows out, you are limited to around 8 mph at 1/3 trottle, any more gas than that and you don't see any more performance.
I had a buddy that recently spent $500 getting a similar engine's carbs rebuilt and I don't know of a "good and reasonable" place locally to have this engine serviced. I have been putting up with this ever since I purchased the engine 4 years ago.
Any suggestions welcomed as I don't want to spend big money when it runs perfect most of the time. However I don't want to put up with this issue if it might be a cheap and easy fix. Since it has 3 carbs I hestitate to do anything more than remove the drain screws and spray cleaner into the drain hole which I have done. My thinking is something is sticking inside the carbs and when it frees up it runs perfect. Compression on the engine is 115 on all cyclinders.
Any help appreciated.
