9-25-11 Rebuild Engine #2. 8hrs. Honed 64MM cylinders. Checked tolerances on piston clearances to .0015 and set timing with dial indicator to 2 degrees below TDC using the method described in the Yamaha manual. This timing setting was recommended by Spec II. Note the ported racing reeds

9-25 Modify ProX Pistons: 1hr: I used ProX RZ pistons. There is a tab on the piston that needs to be trimmed off so you run them on RD's  Got to HVCcylce to read the procedure. I cut my tab off using a dremmel tool and a cut off wheel