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Here's a simple formula i found on the web for computing displacement or cylinder volume(cc): bore(mm) x bore(mm) x 0.0007854 x stroke(mm) ex. vixion is 57 x 57 x 0.0007854 x 58.7 = 149.78858202 cc

shaving 1mm off the stock 54mm cylinder top would raise the compression ratio from 10.9:1 to 12.9:1. shaving 0.5mm will raise the compression ratio from 10.9:1 to 11.8:1.

I used steel saw blade too and a triangular file. I just made the modification yesterday and hope to give you info soon ! So far i noticed that the engine ran smoother, quieter and looks like the power band became wider ! By the way, the photo is a vixion 150 cc block also newly installed with a...

photo of my cylinder head with singh grooves