On the 14 50 sprockets cant you just count the links you have then you would know where to get a 122 or a 126 ?
I got granny gear haha...
If you can't find it, grind it
went to yamaha tw200 parts list it says 14/50 122 link is stock for 2008 and 2009.
1990 model microfiche says "D1D428DS-126L".
122 for stock set-up 14/50... 120 fits perfect for the 14/47 set-up..
These set-ups are a perfect fit.. Now that doesn't mean you can't use the 122 for the 14/47, you can but will have a lot less adjustment to play with. (o; OMM.