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Just to be correct the thread above post 32 line #2. When the control collar is up it holds the spill port closed longer and we get high RPM. When the control collar is down the spill port is open longer and all the fuel spills out and we get a no fuel or shut down.Study exactly what happens when one pulls on the engine shutoff handle of the cable to the thingamahjig which moves the whatisit.
You might not want to just yank on the cable to stop it.
One is operating a valve within a complicated mechanism.
maybe see post 32 in here
I have said it before,
This is only my opinion!
I think the piston sticks in its bore and when the lobe goes down, the button falls off.
The problem is then compounded by the lobe coming up and (now that the button isn't where its supposed to be) it pushes the piston farther up, which is why some get stuck in the "up" position.
That also pushes the piston into a potentially "non-lapped" section of the head which damages the finish on the piston/cyl walls.
Cleaning the plunger and bore with B12 Chemtool, then lapping the piston with clean diesel and holding the plunger in an electric drill has worked for me. I noted milky yellow diesel after 30 seconds of lapping.
Never use any abrasive.
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