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I believe this is the piston I have. .50 Piston 1UY-11636-01 http://www.ebay.com/itm/New-NOS-87-05-Yamaha-Warrior-Wolverine-2ND-Over-Size-50-Piston-1UY-11636-01-/360865226580 Should I order another one like this or get it bored and honed for the next size bigger? I'm thinking about this kit...

Thanks. I'm taking the head and cylinder to work today to mic everything so I'm 100% sure on size before ordering new piston.

Thanks for the quick reply. Yeah, I'm pretty sure its all stock. I bought it off my sister and she owned it for 20 plus years and it sat in her garage most of it's life.

These are what I'm putting on my 87 warrior. http://www.ebay.com/itm/27W-Round-LED-Work-Light-Spot-Headlight-12V-24V-4x4-Offroad-Truck-Boat-ATV-4WD-/281814204671?hash=item419d6f80ff&vxp=mtr

New to site, but have been reading and looking over all the excellent information shared here.:tup: What I have is (I believe all original) 1987 warrior I'm rebuilding. Few Questions: Does this look like the original piston? Why would there be three head gaskets? Before a little elbow...