Lets get the crankshaft/crankcase/rod bearing info all together in one place.
Crankcase Journal ID:
A = 39.000mm - 39.008mm (1.5354" - 1.5357")
B = 39.008mm - 39.016mm (1.5357" - 1.5360")
C = 39.016mm - 39.024mm (15.360" - 1.5363")
Crankshaft Journal OD:
C = 35.990mm - 35.985mm (1.4169" - 1.4167")
B = 35.995mm - 35.990mm (1.4171" - 1.4169")
A = 36.000mm - 35.995mm (1.4173" - 1.4171")
Main Bearing Shell Thickness (remember that diameter = bearing thickness x2):
Yellow = 14.986mm - 1.4990mm (0.5901" - 0.5900")
Green = 14.990mm - 14.994mm (0.5900" - 0.5903")
Brown = 14.994mm - 14.998mm (0.5903" - 0.5904")
Black = 14.998mm - 15.002mm (0.5904" - 0.5906")
Crankshaft/Crank Pin Connecting Rod OD:
C = 35.990mm - 35.985mm (1.4169" - 1.4167")
B = 35.995mm - 35.990mm (1.4171" - 1.4169")
A = 36.000mm - 35.995mm (1.4173" - 1.4171")
Connecting Rod ID
1 = 39.000mm - 39.008mm (1.5354" - 1.5357")
2 = 39.008mm - 39.016mm (1.5357" - 1.5360")
3 = 39.016mm - 39.024mm (15.360" - 1.5363")
Connecting Rod Bearing Shell Thickness (again, diameter = thickness x2):
Yellow = 14.986mm - 1.4990mm (0.5900" - 0.5901")
Green = 14.990mm - 14.994mm (0.5901" - 0.5903")
Brown = 14.994mm - 14.998mm (0.5903" - 0.5904")
Black = 14.998mm - 15.002mm (0.5904" - 0.5906")
Bearing clearance (oil clearance) for both crank and rod bearings:
Standard = 0.020mm - 0.046mm (20 - 46 microns; 0.0008" - 0.0018")
Service Limit = 0.080mm (80 microns; 0.0032")
First thing I want to note here is that crank and rod numbers are all exactly the same.
The other super notable thing is that the tolerances here are all super tight -- much tighter than on most cars. The difference between the largest and smallest bearing (yellow to black) is only 0.032mm, or 0.0012" (remember that you double the bearing thickness for diameter). The tolerances are so small that most of the "very accurate" hand tools in your average bike shop can only just barely measure the difference. Plastigage can measure it easily, but Plastigage is can be a little difficult to consistently use correctly.
Peace and grease
-fang
