Athena 45mm, 65cc, cylinder kit for the Yamaha dt50mx and rd50. Aluminum with nikasil plating. Single ring piston. This cylinder is fast right out of the box but there is plenty of meat left for porting.
This is only for the air-cooled dt50mx and rd50. It will not fit a dt50lc or dt50u. Might fit other models of Yamaha but not guarantee on that.
This cylinder is used on one of the shop bikes and it is a blast to ride.
Comes with cylinder, piston, ring, pin/clips, and full gasket set.