Race Ported Zenoah 25.4cc 4 Bolt G270RC Top End

This is a brand new race ported 25.4cc G270RC 4 bolt top end. This kit comes with a hand ported G270RC cylinder, piston, ring, wrist pin, c-clips, spark plug, 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 exhaust port

4. Raise exaust timing

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