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it could be bad reed valves or might need a carb rebuild. im haveing the same problems wiht my ski and i took the carb apart to check the diaphrams and jets then i took out the reed valves and 3 out of 8 were lifted so i orderd new ones. you might wanna start with all your fule line hoses and make sure there not clooged and also check your fule filter for dirt aswell. if all that's good then start with your reed valves take them out and check them out"they should all be flat on housing and not bent up or cracked/chiped ect. if those are good then check the next thing your carb.... good luck and let me know....

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Q: 1992 Yamaha pw50 was running great then quit acts like fuel problem could it be stuck or bad reed valves?
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