I tried rebuilding my W-1 last year....the problem I ran into was that some of the brass screws inside the carb would not come out. Give it a try. It is not hard. Use a good cleaner and let it soak. I use a carb cleaner from Yamaha...it is spendy, but works like a dream. lay the parts out on a clean white rag, away from dogs, kids or wife. Take your time. All you will have to do is buy a rebuilt and send in your core if you fail...

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