i bought a dna 50 about 6 weeks ago off ebay and it was all good, but now its lost loads of power especially going up hills its down to 15mph, i've changed the valve and rubber pipe on top of the engine block, also cleaned out the carb, but now i'm scratching my head.....thanks
i had a speedfight that went the same and it was piston and piston rings
mark langford
January 2010
Tell me this one thing what type of exhaust pipe does it have....standard or an aftermarket expansion chamber?i would lay bets you reply with it has an aftermarket expansion chamber/race exhaust on it.i await your reply eagerly.:)
adam bike doctor
January 2010
sounds like the piston rings mate not 100% but thats what it sounds like to me
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