bobgritz
Petty Officer 2nd Class
- Joined
- Sep 22, 2009
- Messages
- 185
The Patient: 1998 Johnson 25HP Model J25RECB
The Symptoms: The motor 'misses' or 'coughs' at both slow and high speeds (under load or not). In other words, as your motoring at say 3/4 speed, you can feel the motor essentially cutting out momentarily. It's almost unnoticeable to a casual boater but it's irritating as &%$# to anyone with any decent mechanical sensibility. Please excuse the following, and as weak as this next illustration/explanation is, it's kinda like ... miss ... miss miss ... miss ... miss ... miss miss ... etc. You probably know what I'm talkin' 'bout!
The location of the fuel adjustment screw is obvious and I've made the traditional 1 1/2 turn adjustment (+/-). I was wondering if there is an adjustment for the high speed jet (a non-outboard mechanic told me to tweak this)? However, according to the usual online sources, and after looking at the carb diagram, I suspect it is a fixed setting with only an 'orifice plug' guarding it which I assume is for access & cleaning purposes only.
Perhaps it's electrical but I'd prefer to start with carburetion and go from there.
Any thoughts. Thank you.
The Symptoms: The motor 'misses' or 'coughs' at both slow and high speeds (under load or not). In other words, as your motoring at say 3/4 speed, you can feel the motor essentially cutting out momentarily. It's almost unnoticeable to a casual boater but it's irritating as &%$# to anyone with any decent mechanical sensibility. Please excuse the following, and as weak as this next illustration/explanation is, it's kinda like ... miss ... miss miss ... miss ... miss ... miss miss ... etc. You probably know what I'm talkin' 'bout!
The location of the fuel adjustment screw is obvious and I've made the traditional 1 1/2 turn adjustment (+/-). I was wondering if there is an adjustment for the high speed jet (a non-outboard mechanic told me to tweak this)? However, according to the usual online sources, and after looking at the carb diagram, I suspect it is a fixed setting with only an 'orifice plug' guarding it which I assume is for access & cleaning purposes only.
Perhaps it's electrical but I'd prefer to start with carburetion and go from there.
Any thoughts. Thank you.