Hi,
I’m new to boating and purchased an Invader II (17.2ft) with 140 hp Johnson motor.
The motor has only 500hrs and can get to above 40mph. I’m having two problems:
1- The Tach doesn’t work except in high speed (over 4000 rpm)! I have installed the digital tiny tach on the spark plug wire for now but it would be nice if I can fix the boat tach.
2- The serious problem I have is idling. Most of the time, when I put it in gear (forward or backward), it dies. I have to give it throttle right away to keep it running which is not a good scenario. It is idling too low (500 - 600 in neutral). The idling adjustment screw is adjusted all the way (clockwise). I have new fuel lines, new gas, new spark plugs (all having a spark) and the carburetor is in a good shape. I found two things while investigating after last outing:
1- The idling adjustment link was stuck (dried up grease). It's fixed now but still I don’t thing it was the reason as it was stuck at the max idling adjustment!
2- I took the air cover to expose the carburetors and removed the Idling Air Bleed Orifices (Jets). They weren't too bad and I cleaned them anyway. The carburetors looked clean and in sync. The idling orifices size was #25 while Johnson website shows them as #14 (three times the opening)! Now, I'm wondering if It is running too lean causing my problem! Any insights?
I’m worried of replacing them with the manufacturer’s #14 in case the idling was adjusted to size #25 (As I understand, idle adjustment is a big job that involves timing adjustment at high rpm while on water).
Thank you for your help!
Imad
I’m new to boating and purchased an Invader II (17.2ft) with 140 hp Johnson motor.
The motor has only 500hrs and can get to above 40mph. I’m having two problems:
1- The Tach doesn’t work except in high speed (over 4000 rpm)! I have installed the digital tiny tach on the spark plug wire for now but it would be nice if I can fix the boat tach.
2- The serious problem I have is idling. Most of the time, when I put it in gear (forward or backward), it dies. I have to give it throttle right away to keep it running which is not a good scenario. It is idling too low (500 - 600 in neutral). The idling adjustment screw is adjusted all the way (clockwise). I have new fuel lines, new gas, new spark plugs (all having a spark) and the carburetor is in a good shape. I found two things while investigating after last outing:
1- The idling adjustment link was stuck (dried up grease). It's fixed now but still I don’t thing it was the reason as it was stuck at the max idling adjustment!
2- I took the air cover to expose the carburetors and removed the Idling Air Bleed Orifices (Jets). They weren't too bad and I cleaned them anyway. The carburetors looked clean and in sync. The idling orifices size was #25 while Johnson website shows them as #14 (three times the opening)! Now, I'm wondering if It is running too lean causing my problem! Any insights?
I’m worried of replacing them with the manufacturer’s #14 in case the idling was adjusted to size #25 (As I understand, idle adjustment is a big job that involves timing adjustment at high rpm while on water).
Thank you for your help!
Imad
