Original Yamaha NMAX 125 Exhaust Valve x2 Set (BK6-E2121-00) | 2020–2025

Sale price£33.50 GBP

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


These valves take a proper beating from heat and stress every time the engine runs. This original Yamaha NMAX 125 exhaust valve x2 set (BK6-E2121-00) is made to original Yamaha spec, so it holds up where it matters. It fits exactly as it should and performs reliably under pressure. Swap out worn valves early, and you’ll avoid bigger problems down the line.

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.

Order in the next -- hours -- mins for guaranteed 1 PM Same-Day Dispatch from our London NW10 Hub.
Protect your shift — Back on the road tomorrow.

Guaranteed fitment for Yamaha GPD125-A NMAX or free returns.

Product Compatibility

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Part Number
  • BK6-E2121-00
Alternative Part Number

_

  • B3F-E2121-00
Model
  • GPD125-A NMAX
Year
  • 2020
  • 2021
  • 2022
  • 2023
  • 2024
  • 2025
MFG
  • Yamaha

Product Overview

This high-quality Original Exhaust Valve x2 Set is designed to meet or exceed factory performance standards and is suitable for Yamaha NMAX 125 (2020-2025), YZF-R125 (2019-2025), MT-125 (2020-2025), Tricity 125 (2021-2025), and XMAX 125 (2021-2025) models.

The Exhaust Valve x2 Set provides two precision-ground exhaust poppet valves for the cylinder head, sealing the exhaust port during compression and combustion strokes before opening to expel burnt gases. When exhaust valves wear, develop pitting, burning, or recession beyond their service limit, compression drops, the engine loses power, develops a rough idle, and fuel consumption increases. This original replacement is manufactured to original factory specifications, restoring reliable performance to your Yamaha motorcycles and scooters.

• Brand New Original Exhaust Valve x2 Set
• Part Number: BK6-E2121-00
• Alternative Part Number(s): B3F-E2121-00
• Original replacement for Yamaha NMAX 125 (2020-2025), YZF-R125 (2019-2025), MT-125 (2020-2025), Tricity 125 (2021-2025), and XMAX 125 (2021-2025)
• Provides a complete twin-valve exhaust renewal in a single kit
• Restores correct exhaust port sealing and engine compression
• Restores full power output, smooth idle, and fuel efficiency
• Direct fit, no modification required
• Recommended for replacement during engine top-end 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, YZF-R125, MT-125, Tricity 125, and XMAX 125 owners with low compression, rough idle, or power loss caused by worn or burned exhaust valves
• Replacing the Exhaust Valve x2 Set during engine top-end overhaul or valve service
• Mechanics and workshops carrying out Yamaha engine cylinder head servicing
• Riders wanting to restore the original engine compression and performance of their Yamaha motorcycles and scooters
• Anyone looking for a guaranteed original replacement for their Yamaha NMAX 125, YZF-R125, MT-125, Tricity 125, or XMAX 125

Complete Part Guide

The exhaust valve is where all that engine heat is pushed out, so everything needs to work properly. The original Yamaha NMAX125 exhaust valve x2 set (BK6-E2121-00) controls how exhaust gases are released, keeping the flow smooth and temperatures stable. It’s an important part of how the engine stays balanced under load. Built to Yamaha spec, it seals properly, handles heat well, and performs reliably. Available from Part Hive's London warehouse, order before 1 PM for same-day UK dispatch.

Operating under extreme thermal load, exhaust valves are highly prone to wear and burning over time. This typically results in compromised sealing and reduced engine efficiency. In workshop inspections, it’s a frequent issue on higher-mileage NMAX-125 scooters. Riders may notice performance loss, though the root cause isn’t always clear. We install the correct original Yamaha exhaust valves set and it restores optimal sealing, enhances heat tolerance, and ensures a precise factory-spec fit within the cylinder head.

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