G'day mark....Well with the porting Ive done on the inlet the more imperfections the better Ive added more with the golfball thing they call them turbulators, Google How does a golfball fly and also (The Secret of Golf Balls Revealed) on youtube and you will see what Im doing with that one,its not new they have been doing it for years on race cars and bikes...I will add more about the porting Ive done on this mower later, and by no means am I a pro at porting I just have a go....here are a few pics of an inlet on a Stihl chainsaw of mine with the same thing as im trying to do, but yes true they do it a little better haha.....cheers Chris [Linked Image]
[Linked Image]