Power valve tester?


what shortstop said

take the cover off the servo assembly, and once the servo opens due to the lowered idle, then mark the cable spool and hsouing with a paint pen or scratch marks to indicate the opened position
.
when you pull the powervalves, or adjust the cable lenghts, the servo will inevitable rotate. With the marks, you can just rotate it back by hand or with a pliers to the opened position without needing to restart your engine again and getting the idle down

and the next time you check adjustment. you jsut need to rotate to the open position

ramb
 


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