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8. CYLINDER/PISTON MXU 250R/300R
SPECIFICATIONS Unit: mm (in)
Item Standard Service Limit
I.D. 72.70572.715 72.8 (2.912)
(2.90822.9086)
Warpage 0.05 (0.002)
Cylinder
Cylindricity 0.05 (0.002)
True roundness 0.05 (0.002)
Top 0.0150.055 0.09 (0.0036)
Ring-to-groove (0.00060.0022)
clearance 0.0150.055
Second 0.09 (0.0036)
(0.00060.0022)
Top 0.150.3 (0.0060.012) 0.5 (0.02)
Piston, Ring end gap Second 0.30.45 (0.0120.018) 0.65 (0.026)
Piston ring Oil ring 0.20.7 (0.0080.028) 0.9 (0.036)
Piston O.D. 72.6772.69 72.6 (2.904)
(2.90682.9076)
Piston O.D. measuring position 10mm from bottom of skirt
. 0.010.04
Piston-to-cylinder clearance 0.1 (0.004)
(0.00040.0016)
Piston pin hole I.D. 17.00217.008 17.04 (0.6816)
(0.680080.68032)
Piston pin O.D 16.99417 16.96 (0.6784)
(0.679760.68)
Piston-to-piston pin clearance 0.0020.014 0.02 (0.0008)
(0.000080.00056
Connecting rod small end I.D. bore 17.01617.034 17.06 (0.6824)
(0.680640.68136)
8-3