I would have to go along with DRD and nc cams i to do alot of porting and boring and honing, every engine has its own clearance specifcations and needs as far as air flow goes.As the old saying goes you can always cut some of but its bloody hard to cut some on.Go get some imformation of people that have experiance with that engine.I have had so called machinist stuff cylinders up before especially,2 strokes with there sleeve fittings,and it is not easy to repair.Sure have a go but get the right imfo first good luck greg b |