difficulty in SC with Zingshen

Hello all,
I am new to the community of Chinese bikes. I bought a Zongshen 200cc Sierra from another person and have ridden it for about 3 months. Well the it seems that the push rod crapped out on me and broke off a tip and the ball bearing froze to the other tip. I called around for assistance but nobody would like to help. One bike repair quoted 500 to start but later said would be better if I did the work. No idea what I am doing. Like I said, I really would like my China Bike to be a good experience but so far not so great. Any help would be appreciated. Thanks.:wheelchair:

The motor on the Sierra is based on the Yamaha TW200. Check with SpudRider over at www.chinarider.com. He is the expert on this model. He comes here sometimes but you'll have better luck there.