56.5 mm Cylinder Piston and Gasket Kit for Honda CB125S / CL125S / XL125 / TL125

New aftermarket top-end kit with a 56.5 mm bore, 15 mm piston pin and 48 mm overall pin length. Source-listed displacement is 124 cc. Aluminium and steel construction. References are for application comparison; these are not genuine vehicle-manufacturer parts.

Part references

Cylinder: 12100-383-030; base gasket: 12191-330-306; head gasket: 12251-437-P00; piston: 13101-383-030; piston pin: 13111-440-000; ring set: 13011-383-621; circlips: 94601-15000

Listed applications and restrictions

• Fit for Honda CB 125 S (1976-1985)
• Fit for Honda CT 125 (1979-1983)
• Fit for Honda CL 125 S (1973-1974)
• Fit for Honda SL 125 (1971-1974)
• Fit for Honda TL 125 (1973-1988)
• Fit for Honda XL 125 (1976-1978)
• Fit for Honda XL 125 S (1979-1987)
• In 1976, Honda implemented significant modifications to the 125s cylinder head assembly, transitioning from a single-unit design to a two-piece configuration.
• While retaining the cylinder's fundamental architecture, engineers enlarged the bore diameter from 56mm to 56.5mm, resulting in increased displacement from 122cc to 124cc.
• This revised 56.5mm cylinder assembly, introduced with the 1976 model year updates, maintains complete compatibility with earlier 125s motorcycles despite these technical enhancements.

Included components

• 1x 56.5mm Cylinder
• 1x Piston
• 1x Piston Ring Set
• 1x 15mm Wristpin
• 1x Circlip(2)
• 1x Cylinder Base Gasket
• 1x Cylinder Head Gasket
• 2x Valve Stem Seals

Match the listed references, application and product photos to your original part before ordering.