120 robin engine porting

[New 120 Dad]

 I had the exhaust off for changing some gears. and noticed that the exhaust port on this rodin 120 looks like it would flow bad just above the valve(there is a sharp 90 angle in there). Anybody ever DIY port these thing to give them a boost, nothing crazy just clean it up!

[Bob Vehring]

Most any engines can improve a little from a general clean up, Work on the intake will help more then the ex. Just note, Bigger is definitely not always better