I found this, it shows how to replace the diaphragms on our bikes, it is also the cheapest I have found replacements, 60 bucks for 4


If you do, you will need a whole new diaphragm assembly part$$$





I know guys that do stuff their own way and get away with it. There is a guy on here that adjusts his valves by jamming zip ties between the valves and seats to hold them open, hay, if it works, its your bike, enjoy
Like I say, it their bike, do as you will
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