Original Yamaha NMAX 125 Valve Stem Seal x4 Set (54P-E2119-00) | 2015-2025

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Designed with precision engineering, this offers unmatched performance and durability.


If you're noticing smoke, oil loss, or a drop in performance, worn valve seals are often the cause. This original Yamaha NMAX 125 valve stem seal x4 set (54P-E2119-00) keeps oil where it should be, out of the combustion chamber. Once replaced, the engine runs cleaner, smoother, and more efficiently.

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
  • 54P-E2119-00
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 Seal Valve Stem x4 Set is designed to meet or exceed factory performance standards and is suitable for Yamaha NMAX 125 (2015-2025), XMAX 300 (2017-2025), YZF-R125 (2019-2025), MT-125 (2020-2025), Tricity 125 (2021-2025), and XSR125 (2021-2025) models.

The Seal Valve Stem x4 Set provides four precision elastomeric seals, one fitted to each valve guide where the valve stem passes through the cylinder head. These seals prevent engine oil from being drawn down the valve stem into the combustion chamber during intake strokes. When the seals harden, crack, or deteriorate with age and heat, oil seeps past the valve stems causing blue exhaust smoke on start-up and under deceleration, increased oil consumption, and fouled spark plugs. This original replacement is manufactured to original factory specifications, restoring reliable performance to your Yamaha motorcycles and scooters.

• Brand New Original Seal Valve Stem x4 Set
• Part Number: 54P-E2119-00
• Original replacement for Yamaha NMAX 125 (2015-2025), XMAX 300 (2017-2025), YZF-R125 (2019-2025), MT-125 (2020-2025), Tricity 125 (2021-2025), and XSR125 (2021-2025)
• Enables a complete cylinder head valve stem seal renewal in a single kit
• Prevents oil from entering the combustion chamber via the valve stems
• Restores oil-tight valve stem sealing and reduces oil consumption
• Direct fit, no modification required
• Recommended for replacement during cylinder head overhaul or valve service
• 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, YZF-R125, MT-125, Tricity 125, and XSR125 owners with blue exhaust smoke, increased oil consumption, or fouled spark plugs caused by worn valve stem seals
• Replacing the Seal Valve Stem x4 Set during cylinder head overhaul or valve stem seal replacement service
• Mechanics and workshops carrying out Yamaha engine cylinder head servicing
• Riders wanting to restore the original valve stem sealing and engine oil control of their Yamaha motorcycles and scooters
• Anyone looking for a guaranteed original replacement for their Yamaha NMAX 125, XMAX 300, YZF-R125, MT-125, Tricity 125, or XSR125

Complete Part Guide

Smoke during engine start-up is often caused by oil leaking past worn valve seals, and this original Yamaha NMAX125 Valve Stem Seal x4 Set (54P-E2119-00) for 2015-2025 models is built to eliminate such issues. As seals degrade, oil seeps into the combustion chamber overnight, leading to visible smoke on ignition. This set restores proper sealing and oil control, preventing leakage and ensuring clean start-ups. Manufactured to Yamaha's original standards, it offers accurate fitment and dependable performance. Available now from Part Hive's London warehouse, order before 1 PM for same-day UK dispatch.

Clean combustion relies on controlled oil flow, and that’s why we check valve‑stem seals so closely when engines start running richer or losing efficiency. This original Yamaha seal valve stem x4 set is designed to maintain that control, keeping oil out of the combustion chamber. As the seals wear, oil can seep into the fuel‑air mix, fouling plugs, increasing smoke, and dulling throttle response. We see this regularly during workshop diagnostics and full‑strip rebuilds, especially on higher‑mileage NMAX‑125 units. While the issue may not be immediately obvious, it has a direct impact on how the engine runs. We replace it to restores clean combustion, ensures secure sealing, and supports balanced engine performance.

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