Original Honda PCX 125 Head Gasket Cylinder (12251-KZR-601) | 2012-2020

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The Head Gasket Cylinder (12251-KZR-601) is the original Honda replacement part for Honda PCX 125 (2012-2020). Engineered to withstand extreme combustion pressures and high-temperature coolant flow, this original gasket is critical for preventing head failure and maintaining factory compression levels.

Vetted by our Lead Engineer. Leveraging 30 years of mechanical pedigree, every part is inspected for material density and exact tolerances to ensure a 'Right-First-Time' fit.

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Guaranteed fitment for Honda PCX125 or free returns.

Product Compatibility

Compatibility charts are for reference only. Please compare part numbers and manufacturers' details. Contact us before ordering if unsure to avoid delays or refund charges.

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Part Number
  • 12251-KZR-601
Alternative Part Number

_

  • 12251-KWN-901, 12252-KWN-900, 12251-K12-901, 12251-K40-F01, 12252-K40-F00
Model
  • PCX125
Year
  • 2012
  • 2013
  • 2014
  • 2015
  • 2016
  • 2017
  • 2018
  • 2019
  • 2020
MFG
  • Honda

Product Overview

This high-quality Original Head Gasket Cylinder is designed to meet or exceed factory performance standards and is suitable for Honda PCX125 (2012-2020) models.

The Head Gasket Cylinder sits between the cylinder head and the cylinder barrel, forming a critical seal that contains combustion pressure and isolates the oil and coolant passages crossing the joint. When the gasket fails from age, overheating, or head disturbance during servicing, compression is lost, oil or coolant leaks appear, and combustion gases can cross-contaminate the oil or coolant passages, leading to overheating and engine damage. This original replacement is manufactured to original factory specifications, restoring reliable performance to your Honda scooter.

- Brand New Original Head Gasket Cylinder
- Part Number: 12251-KZR-601
- Alternative Part Numbers: 12251-KWN-901, 12252-KWN-900, 12251-K12-901, 12251-K40-F01, 12252-K40-F00
- Original replacement for Honda PCX125 (2012-2020)
- Restores a reliable combustion, oil, and coolant seal at the cylinder head joint
- Helps prevent compression loss, oil or coolant leaks, and cross-contamination
- Direct fit, no modification required
- Recommended for replacement whenever the cylinder head is removed or during engine top-end overhaul
- London: Express same-day delivery (2-3 hours)
- Rest of UK: Same-day dispatch on orders before 1 PM (3-4 business days delivery).
- Up to 75% off for B2B Trade Accounts. Independent UK garages, apply now.

• Honda PCX125 owners with head gasket failure, compression loss, or oil and coolant leaks at the head joint
• Replacing the Head Gasket Cylinder during engine top-end overhaul or cylinder head service
• Mechanics and workshops carrying out Honda cylinder head and top-end servicing
• Riders wanting to restore the original head sealing and combustion integrity of their Honda scooters
• Anyone looking for a guaranteed original replacement for their Honda scooters

Complete Part Guide

The cylinder head gasket on your Honda PCX125 2012-2020 acts as the high-pressure seal between the engine block and the head, containing combustion gases and liquid coolant. If this component fails, you will likely experience overheating, white exhaust smoke, or loss of power due to compression leaks. This original Honda replacement (12251-KZR-601) provides the precise thickness and material composition required for the 2012-2020 liquid-cooled system. In stock at Part Hive's London warehouse, confirm your order before 1 PM for guaranteed same-day UK dispatch.

Coolant disappearing from the reservoir or bubbles in the radiator are classic signs that a 2012-2020 Honda PCX-125 has a breached 12251-KZR-601 gasket. During a teardown, we frequently observe that many overheating issues stem from using single-layer aftermarket gaskets that cannot handle the thermal expansion of the Honda head. It is a major mistake to reuse old head bolts or ignore the mating surface flatness when installing a new seal. This original Honda Head Gasket is manufactured to the exact thickness and material specification needed to restore a permanent, gas-tight seal, replacing blown, leaking, or inferior aftermarket gaskets.

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