This is a BRAND NEW NOS YAMAHA CARBURETOR TOP RUBBER BOOT. Yamaha part #510-26329-00. It is listed to fit the following Yamaha models;

YZ125
YZ250

YZ360
YZ400
YZ465
YZ490
250MX
360MX
400MX
IT250
IT400
IT465
IT490

It may fit other models as well. This cap could be used on any other motorcycles using this size Mikuni, Kehein, ect., ROUND SLIDE carburetor. The bottom opening is 1 1/2" and the height is 3 1/2".

If you have any questions, message Jim through the ebay "ask a seller a question". 

FREE SHIPPING!!! in the U.S. for USPS 1st Class Mail Shipping. International bidders pay 14.99 for USPS 1st Class Mail International Shipping.

Thanks for looking!!