ITEM DESCRIPTION: NOS Yamaha Piston, 3rd OS (.75mm). Yamaha Part # 401-11637-00-00.

NOTE: We purchased the entire inventory of an old Yamaha dealer that closed down many years ago. This dealer was in business from the late 1960s until the early 1990s. We have 1000s of NOS and some used parts that will soon be listed . Please DO NOT ASK if I have this or that... the parts have not been inventoried so I have no idea what's out there? Check my store periodically (I will get them as soon as I'm able).