" I have a 1975 Johnson 70 HP
" I have a 1975 Johnson 70 HP that all of the sudden will not run full speed. One day I took it out to the lake and it started and ran full speed to a spot and I fished for about 25 minutes. Went to change positions and it would not run full speed. The throwtle was wide open but the boat was running very slow. Don't really know where to begin on checking for a problem. Did check fuel filter and lower unit oil. I am replacing the spark plugs but do not know what else to check. Help would be greatly appreciated.
Also, is the fuel mixture for this engine 50:1 ratio. I thought this might be the problem. Too much oil? "
" I have a 1975 Johnson 70 HP that all of the sudden will not run full speed. One day I took it out to the lake and it started and ran full speed to a spot and I fished for about 25 minutes. Went to change positions and it would not run full speed. The throwtle was wide open but the boat was running very slow. Don't really know where to begin on checking for a problem. Did check fuel filter and lower unit oil. I am replacing the spark plugs but do not know what else to check. Help would be greatly appreciated.
Also, is the fuel mixture for this engine 50:1 ratio. I thought this might be the problem. Too much oil? "