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  1. Yamaha Pw50 with 62,5cc big bore kit with 21mm carb sometimes bog down

    Mechanics Corner
    Hello from Greece, I purchased a Yamaha PW50 1992 model for my nephew , and i made some upgrades. I have put a 60cc big bore kit (44mm piston) modified to 45mm piston, so now the bike is 62,5 cc. I have purchased the PW BIG BORE CAR KIT with 21mm carb, Aluminum intake manifold and Boyesen power...