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Below is everything you need to do a top end rebuild on your MC28. Please select the correct kit for your bike.

There are different kits depending on the piston supplied and the pistons are sized to match the cylinder. The cylinders have a letter stamped on them. A cylinder = B piston  B cylinder = no mark piston, C cylinder = D piston. The largest cylinder bore is A and the smallest is C. However, note that this is only for when cylinders are new or in good condition, so if the cylinder is worn, the corresponding piston will be a looser so a bigger piston might be advised. If the cross hatch honing of the cylinder is very feint then we suggest using the next size up piston. The differences in sizes are tiny (11 microns between largest and smallest) and for the most part not an issue so it is not a problem if a smaller piston is used in a larger cylinder or the other way round.

 

Cylinder A = 54.008mm – 54.011mm        use         Piston B = 53.966mm – 53.969mm

Cylinder B = 54.004mm – 54.008mm        use         Piston # = 53.962mm – 53.965mm

Cylinder C = 54.000mm – 54.004mm        use         Piston D = 53.958mm – 53.961mm

 

Piston to bore clearance = 0.039mm - 0.045mm

 

Show: 

Top End Rebuild Kit MC21/28, Cyl A Assy.

Top End Rebuild Kit MC21/28, Cyl A Assy.

Below is everything you need to do a top end rebuild on your MC21/28. One kit includes all…

Model
NHPS-0001A
Quantity
8
Top End Rebuild Kit MC21/28, Cyl B Assy.

Top End Rebuild Kit MC21/28, Cyl B Assy.

Below is everything you need to do a top end rebuild on your MC21/28. One kit includes all…

Model
NHPS-0001B
Quantity
12
Top End Rebuild Kit MC21/28, Cyl C Assy.

Top End Rebuild Kit MC21/28, Cyl C Assy.

Below is everything you need to do a top end rebuild on your MC21/28. One kit includes all…

Model
NHPS-0001C
Quantity
8
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