Spudrider posted this good info awhile back (
http://tw200forum.co...2/ShowPost.aspx )
"In the interest of helping other riders, I have compiled the following information regarding the availability of countershaft sprockets for the Yamaha TW200 motorcycle. To the best of my knowledge, countershaft sprockets for the TW200 are available from six different manufacturers. If I have made any errors, or omitted any important information, please do correct me.
PBI is a company located in Oregon. They manufacture the following countershaft sprockets that fit the Yamaha TW200:
12-tooth sprocket, part #50-733-12
13-tooth sprocket, part #50-733-13
14-tooth sprocket, part #50-733-14
15-tooth sprocket, part #50-733-15 out of stock 5-2011
I have also seen reports of a 16-tooth sprocket, part #50-733-16. However, this sprocket might not be currently manufactured.
All PBI sprockets should be able to use the Yamaha sprocket bolts and retaining clip without modification.
Parts Unlimited also markets countershaft sprockets for the Yamaha TW200:
13-tooth sprocket, part #K22-2601B
14-tooth sprocket, part # K22-2675
15-tooth sprocket, part # K22-2601C
It has been reported that the Parts Unlimited sprockets require larger bolts, and larger holes must be drilled in the sprocket retaining clip.
JT Sprockets produces one model that fits the TW200:
14-tooth sprocket, part #JTF 1559.14
Sprocket Specialists produces two models that fit the TW200:
14-tooth sprocket, part #566-14
15-tooth sprocket, part #566-15
Be careful to select the correct year of manufacture for your motorcycle when ordering these sprockets. It has been reported by some TW200 owners that these sprockets are a very tight fit on the countershaft.
SunStar Sprockets makes one model that fits the Yamaha TW200:
14-tooth sprocket, part #21314
Finally, Yamaha also markets a sprocket for the TW200:
14-tooth sprocket, part #93823-14149-00
Thank you to all of the previous posters on this forum who have provided me with this information."