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Ya mama was built on a Yamaha XS650 platform by the guys at Pandemonium Custom Cycles. Of course they utilized many parts form their own parts line including but not limited to the 8 Ball oil tank the battery box and the tail light. The thing that jumps out at me on this bike is the leaf spring seat and does something like that need a dampener? Or does it add a new meaning to the term "gotta bounce"?
37 - Flying Piston Score
Ya Mama Bike Specifications - Pandemonium - Custom Choppers