If you guy's want a little trick for the Ninja here you go:

Get two reamers (5.0010mm and 4.1810mm) and a few NovaRossi R5/R7 rods:

NovaRossi Crank pin= 4.9950mm
NovaRossi rod bottom= 4.9975mm
clearance= 0.0025mm
NovaRossi wrist pin= 4.0000mm
NovaRossi rod top= 4.0025mm
clearance= 0.0025mm

Ninja crank pin= 5.0000mm
Bottom of rod= 5.0150mm
clearance = 0.015mm
Ninja pin= 4.1800mm
Ninja rod top= 4.2000mm
clearance= 0.02mm

Ream the R5/R7 rods by hand since the top and botom ends are smaller bores and you are all set.

The R5/R7 rods are 0.01mm wider on the bottom and 0.01mm narrower on the top which will not affect anything since the bottom of the Nova rod does not go past the end of the Ninja crank pin and will not hit the backplate.

The clearance numbers don't look that different till you notice they are a decimal place more on the Ninja (10x more). Use the two above reamers by hand and you will have a more perfectly clearanced rod for the Ninja that is bushed on both ends.

I used four sets of precision Deltronics sizing bars (they come in 0.0005mm increments) and checked two Ninjas and two 321P's.... clearance numbers were the same for each brand. Hand reaming will result in a slightly larger hole than the reamer size you select.... that is why smaller reamers than you would expect were selected for the reaming process.