Porting Head Honda Karisma / Supra X 125
Daily porting tutorial for upgrading valve sizes. Porting sizes are done in a simple way. The port section on the seat and the port section towards the intake are reamed using the valve size benchmark, subtracting 3-3.5mm from the valve size (e.g., a valve size of 25 is reamed to 22 or 21.5), and the section near the valve bushing is subtracted by 0.5-1mm.
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