Specifications, Mechanical

Pistons (engine capacities)





Piston running clearance (example)
Measured cylinder diameter 83.015 mm
Measured piston diameter 82.995 mm
The piston running clearance is 0.020 mm
The piston running clearance must be 1.010 - 0.030 mm





Piston rings
Axial clearance
Upper compression ring 0.030 - 0.070 mm
Lower compression ring 0.030 - 0.070 mm
Oil control ring assembly 0.038 - 0.142 mm
Compression ring dimension
Upper 1200 -0.010/-0.030 mm
Lower 1500 -0.010/-0.030 mm
Dimension, three piece oil ring
Spring 1510 +/- 0.020 mm
Rail 0.460 +/- 0.011 mm
Piston pin
Diameter (mm) 21.000 +0/-0.004
Length (mm) 60.000 +0/-0.200

Crank mechanism





Crankshaft
Main bearing journal radial runout maximum 0.040 mm
Axial play (Measured in the engine with the intermediate section tightened); 0.08 - 0.19 mm
Main bearing journal radial runout 0.020 - 0.043 mm





Big end journals
Diameter, standard 50.000 +0/-0.016
Bearing recess width 26.0 +/- 0.1 mm
Maximum out-of-round 0.004 mm
Maximum taper 0.004 mm
The variation in diameter for each bearing journal must not exceed 0.008 mm.
Main bearing journals
Diameter, standard 65.000 +0.003/-0.016
Axle bearing width 26.0 +0/- 0.4 mm
Maximum out-of-round 0.004 mm
Maximum taper 0.004 mm
The variation in diameter for each bearing journal must not exceed 0.008 mm.





Diameter, bearing recesses
Big end (mm) 53.000 -0/+0.03
Small end (mm) 12.000 +0.11/+0.005
Maximum ovality in the bearing recesses 0.006
Length big end-small end (mm) 139.5