1992 mercury 25 cutting out.

arkansashunter

Seaman Apprentice
Joined
May 4, 2011
Messages
35
Hey. I have a 1992 mercury 25 that i just put a new switchbox on. It has mechanical timing advance.

It starts up and idles great but when i increase the throttle it dies. At first i thought cdi may have sent me the wrong switchbox but i swapped it for a mallory and it does the same thing.

The odd thing is when i removed the throttle advance linkage under the flywheel it reves just fine. What would be causing this? Before it ran just fine.

There is a picture attacted showing exactly which linkage it is.

I added a charging coil to the motor, Could that be causing this?

Thanks
 

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arkansashunter

Seaman Apprentice
Joined
May 4, 2011
Messages
35
Re: 1992 mercury 25 cutting out.

Any idea what so ever? The stator test ok, but i was told it could still be a high speed output issue. However like i said it runs great with the mechanical advance linkage disconnected.
 

arkansashunter

Seaman Apprentice
Joined
May 4, 2011
Messages
35
Re: 1992 mercury 25 cutting out.

Could this be cause due to a bad trigger? on the multimeter with the throttle at idle it reads 7.8 then when you throttle it up the reading completely drops out of range. Is this normal? this directly relats to when i disconnect the linkage and the trigger remains in the same spot the motor doesnt kill out. Does this make sense?
 
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