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Comprehensive Online Parts Manual - MC16 | MC21 | MC28
MC21/MC28 Crank Specifications.
NSR250 cranks are generally regarded as non-rebuildable, but a limited supply of bearings has recently become available. Check out our Classifieds Forum for details!
For crank service specifications, refer to the illustrations below.

Crankshaft journal runout:

 
Standard
Service limit
A.
0.05mm
0.10mm
B.
0.03mm
0.08mm
C.
0.05mm
0.10mm

Con-rod axial clearance.

X. Y. Service limit: 0.05mm

Click for larger image...

Con-rod lateral play.

Standard:
Service limit:
0.55mm - 0.75mm
0.85mm
Use the correct rotor puller attachment or a suitable spacer when removing flywheel to avoid damage to the crank.
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