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Re: gz 250 wont rev up
My girl friend has a 99 gz250 and it wouldn't go over 40MPH. cleaned the carb, still same problem. I then notice that the Valve, Piston wasn't moving when the throttle was opened up. I found that the diaphragm (13507-19E00) was damaged. replaced it and now the bike runs great. when replacing the diaphragm.
good luck
rick
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