1996 mercury 9.9 outboard, stalls when decelerating

[woodchop]

I am re-posting this from another site...

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

 

[Texasmark]

I am re-posting this from another site...

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

Whatever your other problems are, your 90 psig on compression checks are 30# below the Merc Manuals specks for 2 stroke compression of "If compassion is less than 120 PSIG, expect problems". With that disparity, I'm amazed that it runs at all!!!!!!

 

[flyingscott]

Whatever your other problems are, your 90 psig on compression checks are 30# below the Merc Manuals specks for 2 stroke compression of "If compassion is less than 120 PSIG, expect problems". With that disparity, I'm amazed that it runs at all!!!!!!

Are you positive your looper 2 strk compression is appropriate for a crossflow?

 

[racerone]

I think the 9.9 might be / is a looper.----And it will run at 90 PSI.-----Remove bypass covers and inspect pistons / rings.----Easy and no parts needed to do that.

 

[flyingscott]

I think the 9.9 might be / is a looper.----And it will run at 90 PSI.-----Remove bypass covers and inspect pistons / rings.----Easy and no parts needed to do that.

Pretty sure its a crossflow.