Original Yamaha NMAX 125 Decompression Assembly (B6H-E2280-10) | 2021-2025

Sale price£21.95 GBP

Running a Workshop or Delivery Fleet? Unlock Up to 75% Trade Discount.

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


If starting feels heavy or inconsistent, the decompression system may not be doing its job. This original Yamaha NMAX 125 decompression assembly (B6H-E2280-10) reduces internal engine load during start-up, making ignition smoother and helping protect key components from excess strain.

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

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.

Trademark Disclaimer: All trademarks, brand names, and logos remain the property of their respective owners and are used solely for identification and compatibility purposes. We are an independent retailer and are not affiliated with any authorized dealer or distributor.

Part Number
  • B6H-E2280-10
Alternative Part Number

_

Model
  • GPD125-A NMAX
Year
  • 2021
  • 2022
  • 2023
  • 2024
  • 2025
MFG
  • Yamaha

Product Overview

This high-quality Original Decompression Assy is designed to meet or exceed factory performance standards and is suitable for Yamaha NMAX 125 (2021-2025) models.

The Decompression Assy mounts on the camshaft and automatically releases a small amount of cylinder compression during cranking, allowing the starter motor to spin the engine easily for smooth, consistent starts. When the mechanism seizes, its spring weakens, or its weights wear, cranking speed drops, starting becomes laboured or intermittent, and the starter motor and battery are placed under greater load. This original replacement is manufactured to original factory specifications, restoring reliable performance to your Yamaha scooter.

- Brand New Original Decompression Assy
- Part Number: B6H-E2280-10
- Original replacement for Yamaha NMAX 125 (2021-2025)
- Restores easy, consistent cold and hot starting
- Helps reduce starter motor and battery load during cranking
- Direct fit, no modification required
- Recommended for replacement during cam chain service, engine top-end overhaul, or when starting issues are diagnosed
- 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 owners with hard starting, slow cranking, or a seized decompression mechanism
• Replacing the Decompression Assy during cam chain service or engine top-end overhaul
• Mechanics and workshops carrying out Yamaha starting and top-end engine servicing
• Riders wanting to restore the original starting reliability and cranking ease of their Yamaha scooters
• Anyone looking for a guaranteed original replacement for their Yamaha scooters

Complete Part Guide

If the engine feels heavy to crank or struggles on start-up, the decompression system is often the cause. The original Yamaha NMAX125 Decompression Assembly (B6H-E2280-10) for 2021-2025 models reduces initial compression during ignition, allowing the engine to turn over smoothly without excessive load on the starter. This ensures consistent, effortless starts and protects key starting components. Manufactured to the original Yamaha specification for precise timing and reliable durability. Available now from Part Hive's London hub, enjoy same-day UK dispatch on all orders completed before 1 PM.

We've seen Yamaha NMAX-125 starters fail earlier than expected, and in some cases, the root cause is a faulty decompression system. If compression isn't relieved properly, the starter takes all the load. Over time, that wears it out. We replace it with the original Yamaha decompression assembly, and it takes that pressure off; everything works as it should again.

Get the Right Parts for Your Ride with Part Hive

Finding the perfect part for your motorcycle is easy with Part Hive. Here’s how we make it simple for you:

Wide Selection

From brakes and suspension to mirrors and body fairings, we stock parts for all major motorcycle brands and models.

Easy Fit

Use our filters or search tools to quickly locate parts compatible with your make, model, and year.

Trusted Quality

All our parts are sourced from reliable manufacturers, including high-quality aftermarket options.

Fast Delivery

Order online and get your parts delivered quickly, so you can get back on the road without delay.

Part Hive FAQ

Your Guide to Smooth Rides