CIS gurus rebuilding questions

[rich]

I have a 1980 euro spec "S" 928 motor with factory CIS. I'm currently rebuilding the motor. When I took off the air cleaner I curiously pushed on the Sensor plate. I thought it would spring back. it didn't.... It seems like the pivot is corroded or the spring lost tension. I have the manual on CD. It looks like a fairly simple assembly. I was thinking of pulling it apart and checking things out.

Any pit falls I should be aware of?

Anyone have a hunch why the sensor plate is sticking?

When you purchase a rebuilt CIS unit for like $ 1000.00+ What are they doing to rebuild the unit?

What parts are replaced as part of the rebuild?

BTW: I know this isn't the 928 board but CIS is CIS. Anyone with practical experience?

[RarlyL8]

The piston in the fuel head is a machine matched fit to its bore with a very tight tolerance. While the sensor plate should not stick in place it does return slowly. If you turn on the fuel pump the plate should pop shut. If it does not you need to inspect the arm bushings before pulling the fuel head. If the problem turns out to be the piston you can pull the head and soak the bore in carb cleaner. Be careful when removing the piston, do not scratch or drop it.

[pjv911]

Originally posted by RarlyL8
The piston in the fuel head is a machine matched fit to its bore with a very tight tolerance. While the sensor plate should not stick in place it does return slowly. If you turn on the fuel pump the plate should pop shut. If it does not you need to inspect the arm bushings before pulling the fuel head. If the problem turns out to be the piston you can pull the head and soak the bore in carb cleaner. Be careful when removing the piston, do not scratch or drop it.

Basically the same thing I was going to say.

Kurt Williams