2004 Johnson 25hp 2 stroke sputtering or bogging

Jcrummer

Recruit
Joined
Dec 5, 2024
Messages
1
I recently purchased a 2004 Johnson 25hp 2 stroke. It runs fine 80% of the time but will occasionally start to sputter or bog when I try to accelerate. Sometimes when it happens I can let down on the throttle and idle for 30 seconds or so and it’ll be fine. Other times, the issue never resolves itself. I’m new to owning a boat, just trying to figure out what could be causing this. Any help or input is much appreciated. I will attach a video for reference. Thanks in advance.
 

Attachments

  • IMG_3037.mov
    27.1 MB · Views: 0
  • IMG_3037.mov
    27.1 MB · Views: 0

racerone

Supreme Mariner
Joined
Dec 28, 2013
Messages
37,972
Hook up a timing light one cylinder at a time.----Might help pinpoint which cylinder is the issue.-----Might be as simple as a bad sparkplug.----Or bad sparkplug wire.---Or loose connection / broken wire.
 

saltchuckmatt

Commander
Joined
Jul 19, 2019
Messages
2,738
Try squeezing the primer ball on the gas line when it bogs down. Fuel pump could be the issue or dirty carb.

Post results.
 
Top