Originally posted by jfz
I am working on a bike I found at the dump. It has an SIS SHIFTER/DERAILLEUR and the chain jumps when I have it on the largest rear sprocket to the next one, I believe the shifter may be loose and wanted to know if you just pry the top of the shifter off to get at the adjustment screw?
I have yet to see an adjustment IN a shimano sis shifter.The adjustment in in the rear derailer,assuming there is nothing else contributing to the problem. Try
www.parktool.com for derailer adjustment. The chain and the cassette could also be worn.