BarnYard Customs. Velocity stacks Hello my name is Matt and I've started designing and producing a couple custom parts for the Yamaha xs650s. The first part i have available are these velocity stacks (this specific part is not designed by me) that will fit all years of the xs650 carbs. They are machined out of aluminum and include brass screens and set screws. They are available in polished and machined finish. The priced for polished is $85 and machined finished is $80. Shipping will be free on all of my items. Thanks for looking and stay tuned for some new parts that will be listed very very soon. You can contact me through here or e-mail me at Barnyardcustoms@yahoo.com My next part should be listed in the mid this week.