1996 mercury 9.9 stalls when decelerating

[woodchop]

I have a new-to-me outboard... and it's giving me fits. The motor stalls when I decelerate.
I have re-built the carb and cleaned it well.
I tried an older model carb and the issue persists with no change (still stalls when I decerate)
I have checked all of the coils (trigger, stator and port and starboard) they all appear to be within range except for the trigger coil. Per the manual, part number 98450A5 should be between 1200-1400 ohms. I am getting a reading of .731. could that be the reason for it stalling when I decelerate?
Bill

 

[AllDodge]

I have checked all of the coils (trigger, stator and port and starboard) they all appear to be within range except for the trigger coil. Per the manual, part number 98450A5 should be between 1200-1400 ohms. I am getting a reading of .731. could that be the reason for it stalling when I decelerate?
Bill

Not an OB guy but manual list it should read 1200-1400 ohms and it reads .731 ohms would be bad in my view.
Now if your meter is auto ranging it may be that or your not measuring it correctly. Does it mention that it should be done connected or disconnected from the harness?

How is the compression of the motor?

 

[woodchop]

I re-assembled the motor and ran it in a barrel. While running, I checked the stator voltage. It is steady at 85 volts and increases to 95 plus when revving. however, it still stalls when decelerating. Anyone out there have such an issue?
* I have tried another complete carb and it does the same
* I have re-built the carb that is on the unit now.
* I have checked the block for leaks and did change the O-ring that seals the output shaft
* the compression is 90 psi on both cylinders.
Bill

 

[AllDodge]

Suggestion, post your thread on iBoats forum. There are more folks there
https://forums.iboats.com/forum/mercury-mariner-outboards.27/

 

[flyingscott]

Open the low speed screw a 1/4 turn