6235 - Race Ported 28.5cc 4 Bolt Top End

<p>(Our porting is not shown in picture)<br />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:</p> <p><br />1. Resurface all ports for better gas/air mixture<br />2. Modify transfer ports for better flow<br />3. Enlarge and reshape exhaust port<br />4. Exhaust timing raised to our specs<br />5. Re bevel all porting and factory bevels to prevent damage to the top end</p>