After riding it for 70,000 miles, the engine in my Zongshen ZS200GY-2 finally wore out. I recently replaced the original Zongshen engine with a 1992, Yamaha XT225 engine. I transferred the Zongshen kick starter into the Yamaha engine, and it fit perfectly. If you are interested, you can read about my engine swap at the following thread.
Project Phoenix: The YamaZong Rises from the Ashes - ChinaRiders Forums
I can put together a kick starter kit with Zongshen parts. As I understand it, your TW200 bikes need the following parts.
Kick Axle Assembly
Kick Crank Assembly
28T Idler Gear
Finally, you will also need a Kick Shaft Oil Seal
If anyone is interested, I can obtain these parts from China, and sell you a kick starter kit for a very reasonable price. These Zongshen parts are manufactured to a Yamaha standard of quality.
I believe the original Yamaha kits had a retail price of $163.99, and were marked up as high as $250. If enough people are interested, I believe I can sell you a complete kit for approximately half the retail price of the original Yamaha kit. Please let me know what you think.