You can find thousands of places on the internet selling yamaha oem parts. Ebay can allso be a treasure trove of needed parts.
I used a piece of cork from a wine bottle to close off that hole till the one I ordered came in. Just used a razor knife to cut a slit in it slightly smaller than the cases and slide it in then bolted the stator cover back on.
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2006 Yamaha Blaster 200 YFS200V Parts, 2006 Yamaha Blaster 200 YFS200V OEM Parts - BikeBandit.com