Re: Milky fuel & moisture in newly rebuilt carbs, Johnson still fails under load
Yes I do, Pete. I feel sick at my stomach....
All this done, and you hint/suggest that the timer base is not moving.
All I can say is YES. The timer base is supposed to move as you advance the throttle.
I am sorry that this wasn't suggested to be checked earlier.
The carbs opening along with the timing advance is all mechanically controlled. If you disconnect the throttle cable where it connects to the lever, with the engine off, you can operate the whole linkage by hand. You will see, as you move the throttle lever, the linkage is connected to the timer base under the flywheel. The timer base should move smoothly thru it's complete range until it hits the WOT stop bumper which is under the front edge of the flywheel, kinda situated to the starboard of center.
What is your timing spec at idle? 4-6 degrees ATDC. What is your WOT timing spec? 18 degrees BTDC.
So the timer base rotates a total of 22-24 degrees as it travels thru it's range. That timing advance is all mechanical.
It is held down with two very large headed pan head screws front and back and two small clips that holds the wires. It rides on a nylon bushing that is usually greased lightly, so the timer base will turn freely. The only way to get to it for re-greasing or to otherwise free it up is to pull the flywheel.
Alot of times the stator has melted, the goo has run down onto the timer base, and it is stuck because of that.
Reach up under the flywheel from the starboard side and see if you can move it by hand. Maybe you will see something obvious that you can fix to get it moving freely again. If not, pull flywheel and free it up.
Stuck timer base will cause the engine to kill when throttle is applied.
Yes I do, Pete. I feel sick at my stomach....
All this done, and you hint/suggest that the timer base is not moving.
All I can say is YES. The timer base is supposed to move as you advance the throttle.
I am sorry that this wasn't suggested to be checked earlier.
The carbs opening along with the timing advance is all mechanically controlled. If you disconnect the throttle cable where it connects to the lever, with the engine off, you can operate the whole linkage by hand. You will see, as you move the throttle lever, the linkage is connected to the timer base under the flywheel. The timer base should move smoothly thru it's complete range until it hits the WOT stop bumper which is under the front edge of the flywheel, kinda situated to the starboard of center.
What is your timing spec at idle? 4-6 degrees ATDC. What is your WOT timing spec? 18 degrees BTDC.
So the timer base rotates a total of 22-24 degrees as it travels thru it's range. That timing advance is all mechanical.
It is held down with two very large headed pan head screws front and back and two small clips that holds the wires. It rides on a nylon bushing that is usually greased lightly, so the timer base will turn freely. The only way to get to it for re-greasing or to otherwise free it up is to pull the flywheel.
Alot of times the stator has melted, the goo has run down onto the timer base, and it is stuck because of that.
Reach up under the flywheel from the starboard side and see if you can move it by hand. Maybe you will see something obvious that you can fix to get it moving freely again. If not, pull flywheel and free it up.
Stuck timer base will cause the engine to kill when throttle is applied.
