Here's what I would do:

1. Remove the cables from both the servo pulley and the RC Valve pulleys.
   
   
2. Insert pins into the RC Valve pulleys to lock them to the back-plates.
   
   
3. Either:
   
   
   • Start the motor, and rev it lightly. At 2000rpm the servo pulley should move to "Hi". Increase the revs slowly, and at 3000rpm it should move back to "Lo",
     
     
   • or disconnect the T.P.S. and see if the servo pulley moves to "Hi". Re-connect the T.P.S. and the servo should return to "Lo".
     
     If the pulley moves, then the fault's likely to be tight cables or carbon build-up causing the Valve(s) to stick/jam.
   
   
   
4. If the servo operates correctly, extract the RC Valves and thoroughly clean them. Check the cables move freely, and lubricate/replace them as necessary.

If the servo doesn't operate under any of these tests, the the controller is probably dead. RC Valve controllers die far more often than servos do.

You can do a simple test on the servo by removing the pulley and just connecting it to +12V. The spline the pulley sits on should just spin.

There are 2 boxes under the seat on an 88. One says PGM and sits vertically on the side of the subframe and is the CDI, the other sits horizontally and is the RC Valve controller.

RC Valve control circuits fry due to poor maintenance.
_________________
Andy.
NSR-WORLD.COM

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