Zongshen RX3 (ZS250GY-3) Engine Videos
 

The Kayo T6 dirt bike employs the same engine as the new, Zongshen RX3 (ZS250GY-3). Although the engine and transmission share the same oil, the NC250/ZS177MM engine has two oil drain plugs. The engine also has two coarse oil filters, and a fine oil filter. The following video shows how to change the oil, and service the oil filters for the NC250 engine.

https://www.youtube.com/watch?v=aCwr3O6y2Z4

In this video, the videographers remove the cylinder head from the engine in a Kayo T6 dirt bike. The videographers also removed many other items from the engine which are not necessary to remove if you only wish to work on the cylinder head. ;)

https://www.youtube.com/watch?v=0M8SY2Z7RtY

This video shows how to do a valve job on the cylinder head. In addition, the videographers ported and polished the intake, and exhaust manifolds, as well as the exhaust header.

https://www.youtube.com/watch?v=1FiPlUnvdqs

This video shows the installation of the cylinder head, and adjusting the valve lash.

https://www.youtube.com/watch?v=Xgmgwdu1NHA