Race Ported Zenoah 28.5cc 4 Bolt 36mm Top End With Lightened Piston

This is a brand new race ported 28.5cc G290RC 4 bolt top end. This kit comes with a hand ported G290RC cylinder, piston, ring, wrist pin, c-clips, spark plug, needle bearing and base gasket. The following port work has been done:

1. Resurface all ports for better gas/air mixture

2. Modify transfer ports for better flow

3. Enlarge and reshape exhaust port

4. Exhaust timing raised to our specs

5. Rebevel all porting and factory bevels to prevent damage to the top end

6. Lighten Piston