Hi I have a 25 hp Evinrude Big twin that I have been working on . thanks to all for all the advise so far. I have it set up in my test tank, and after running it for 15 minutes I see some black sluge floating on top of the water. I am not sure if this is from the fuel mix, or perhaps the lower end. I am running 24;1 which might be a bit rich. [It smokes quite a lot ] Any advise on a different mix? perhaps 32:1? Has any one noticed this type of sluge in there test tank? maybe I should just takes it out and run it? [it has been sitting for a few years] any thoughts would be greatly appreciated. Thanks Todd
