I have a 9.5hp johnson from 1960s maybe 70s. The boat sat for awhile in a garage. I have no idea how long but enough that there was a nest inside the engine compartment. I cleaned out the nest and started the engine. First pull was totally amazed. Brought the boat out on the lake ran fine that whole day.
Second time out the engine got fresh gas and oil properly mixed. The engine would go great then slow down go great slow down. I couldn' tmake sense of this as it worked great the first time i took it out. Then I started thinking well the gastank probably has a bunch junk in the tank. *(water debri etc)* so I cleaned the tank out completely. New gas and oil. Third time out the engine ran fantastic. One pull to start. The engine ran really strong and then slowly started to lose power. Then I shut it off thinking the worst. Gave it a few minutes while I fished and let the engine cool. I went to start it and I couldn't for the life of me get it going. I saw gas and oil in the water so I know it was getting proper fuel. Could this be a clogged inline filter, fowled plug, bad carb?
TLDR: engine lost power and wouldn't start again.
Second time out the engine got fresh gas and oil properly mixed. The engine would go great then slow down go great slow down. I couldn' tmake sense of this as it worked great the first time i took it out. Then I started thinking well the gastank probably has a bunch junk in the tank. *(water debri etc)* so I cleaned the tank out completely. New gas and oil. Third time out the engine ran fantastic. One pull to start. The engine ran really strong and then slowly started to lose power. Then I shut it off thinking the worst. Gave it a few minutes while I fished and let the engine cool. I went to start it and I couldn't for the life of me get it going. I saw gas and oil in the water so I know it was getting proper fuel. Could this be a clogged inline filter, fowled plug, bad carb?
TLDR: engine lost power and wouldn't start again.