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An acquaintance called me one day after learning I had a China bike to ask me to diagnose the problem he was having on his bike -- same as yours, the bike would barely go 100 kph. I told him I was no mechnic but would come look it over. I did, jumped on the bike and found it would easily hit 120 kph with me on it. As I rode my whole 200 lbs. back in to the guy's driveway, I saw his 280-pound self waiting for me, and I had my diagnosis and treatment plan already. Diagnosis -- trying to move excess weight around with a tiny 18-hp motor. Treatment -- lose weight. Trust me, no amount of carb jetting or sprocket changing is gonna fix it if that's your problem.
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