Cylinder Kit 58mm Bore Piston Rings Gaskets 2004-2017 Honda CBR125R FS125

This 58mm Cylinder Piston Gasket Rebuild Kit is an aftermarket top-end replacement designed to restore the cylinder and piston assembly. The kit includes all necessary components to address issues such as low compression, cylinder blow-through, or piston seizure. Modification to the crankcase surface may be required for proper fitment depending on engine type.

Compatible Models

• Honda CBR125R 2004–2017
• Honda FS125 Sonic 2001–2008

Features

• Suitable for addressing low compression, piston seizure, or cylinder failure
• Includes cylinder, piston, rings, wristpin, clips, and full top-end gasket kit
• Piston is anodized for improved heat resistance and extended service life
• Gaskets made from high-performance materials for increased reliability
• Designed for standard bore size: 58mm x 47.2mm stroke
• 13mm steel piston pin
• Compression Ratio: 11:1
• Cost-effective replacement for original components

Specifications

• Bore Diameter 58mm (STD)
• Stroke 47.2mm
• Pin Diameter 13mm

Cross-Reference OEM Part Numbers

• Cylinder 12100-KGH-900
• Cylinder Base Gasket 12191-KGH-901
• Cylinder Head Gasket 12251-KTY-D30
• Piston (Std) 13101-KGH-902
• Pin, Piston 13111-KGH-903
• Piston Ring Set (Std) 13011-KGH-305
• Circlips, Piston 13115-GN5-910
• Tensioner Gasket 14560-KGH-900
• Valve Stem Seal 12209-GB4-682

Attention

• This kit originates from the Honda Sonic 125, which shares the same engine platform as the European CBR125R and Indonesian CS1 4-stroke engines
• The cylinder surface design differs slightly between Sonic and CBR125 models
• For CBR125R installation, modification of the crankcase surface is required to eliminate any gap (modification methods include welding or using a two-component epoxy aluminium glue)
• After modification, the cylinder is compatible with both Sonic and CBR engines

Package Includes

• 1x 58mm Cylinder (12100-KGH-900)
• 1x Piston
• 1x Piston Ring Set
• 1x Wristpin
• 2x Circlips
• 1x Cylinder Base Gasket (12191-KGH-901)
• 1x Cylinder Head Gasket
• 1x Tensioner Gasket
• 2x Valve Stem Seals