Original Yamaha NMAX 125 Cylinder Head Valve Cotter (5TL-E2118-00) | 2015-2025

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Discover the ultimate upgrade for your motorcycle.
Designed with precision engineering, this offers unmatched performance and durability.


It might be a small part, but it does an important job. This original Yamaha NMAX 125 cylinder head valve cotter (5TL-E2118-00) keeps the valve assembly securely in place, so everything in the valve train works as it should. Built to Yamaha’s standards, it fits properly and holds up over time. If the cotter's worn, it can affect how stable the valves are. Replacing it keeps everything secure and running right.

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 Yamaha GPD125-A NMAX or free returns.

Product Compatibility

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Part Number
  • 5TL-E2118-00
Alternative Part Number

_

Model
  • GPD125-A NMAX
Year
  • 2015
  • 2016
  • 2017
  • 2018
  • 2019
  • 2020
  • 2021
  • 2022
  • 2023
  • 2024
  • 2025
MFG
  • Yamaha

Product Overview

This high-quality Original Cylinder Head Cotter Valve is designed to meet or exceed factory performance standards and is suitable for Yamaha NMAX 125 (2015-2025), XMAX 300 (2017-2025), and Tricity 125 (2015-2024) models.

The Cylinder Head Cotter Valve is a split tapered retaining clip that seats in the groove of the valve stem and locks the valve spring retainer collar in place, holding the valve spring under correct compression load. If the cotter deforms, fatigues, or dislodges, the retainer releases, the valve spring collapses, and the valve can drop into the combustion chamber, causing catastrophic cylinder head and piston damage. This original replacement is manufactured to original factory specifications, restoring reliable valve train retention to your Yamaha motorbikes.

- Brand New Original Cylinder Head Cotter Valve
- Part Number: 5TL-E2118-00
- Original replacement for Yamaha NMAX 125 (2015-2025), XMAX 300 (2017-2025), and Tricity 125 (2015-2024)
- Securely retains the valve spring retainer on the valve stem, preventing catastrophic valve drop
- Protects the cylinder head and piston from valve failure damage
- Direct fit, no modification required
- Recommended for replacement during cylinder head overhaul, valve service, or any top-end rebuild
- 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.

• Yamaha NMAX 125, XMAX 300, and Tricity 125 owners replacing valve cotters during cylinder head or valve service
• Replacing the Cylinder Head Cotter Valve during engine top-end overhaul or valve spring service
• Mechanics and workshops carrying out Yamaha scooter engine cylinder head servicing
• Riders wanting to restore the original valve train retention and engine reliability of their Yamaha motorbikes
• Anyone looking for a guaranteed original replacement for their Yamaha NMAX 125, XMAX 300, or Tricity 125 scooter

Complete Part Guide

Some components are there to prevent problems before they happen, and the valve cotter is one of the most critical small parts in the top end. The original Yamaha NMAX125 Cylinder Head Valve Cotter (5TL-E2118-00) for 2015-2025 models keeps the valve spring and retainer firmly secured, preventing movement that could lead to serious engine issues. It's a key part of maintaining safe and stable operation. Built to Yamaha's original standard, it delivers secure retention, accurate fitment, and dependable performance. In stock at Part Hive's London warehouse, order before 1 PM for same-day UK dispatch.

Sometimes during a rebuild, something just doesn't sit quite right in the valve assembly. More often than not, it comes down to worn or slightly deformed cotters not gripping the valve stem properly. We see it more than you'd expect, especially on engines that have been apart before. It's a small part, so it's easy to overlook, but it plays a big role. We fit the correct original Yamaha NMAX-125 cylinder head valve cotters, and it brings everything back, proper hold, secure fit, and a stable valve setup.

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