Slow to get up to speed - 115 Johnson

[john3357]

I have a 1984 Johnson 115 outboard. The boat excelerates very slowly and does not have the speed it once had (I'd say 5 to 7 mph slower). Any clues what may be causing it?

 

[racerone]

Broken piston rings ??-------Start with a compression test on that motor.

 

[emdsapmgr]

After you check compression: It may not be firing on all 4 cyls. Water in the fuel. Restriction in the carb fuel passages. Weak fuel pump. It's either a fuel or spark issue. Easy/simple to check spark first.

 

[boobie]

Do a cylinder drop test on it to see if it's running on all four.

 

[jakedaawg]

After compression test, I would check for a waterlogged boat. If the boat is moored,or left uncovered, and has a floor, the foam may be full of water. Its something I find up here where boats seem to last for ever.