
Aftermarket Honda PCX 125 Spark Plug MR8K9 (31918-K97-T00) | 2018-2020
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Discover the ultimate upgrade for your motorcycle.
Designed with precision engineering, this offers unmatched performance and durability.
Engineered for efficient combustion, this Honda aftermarket Spark Plug (31918-K97-T00, MR8K9) for Honda PCX 125 (2018-2020) eliminates ignition lag and restores smooth engine response. Its high-conductivity core is built to withstand intense thermal stress, ensuring reliable starts and consistent power delivery for your daily commute.
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.
Guaranteed fitment for Honda PCX125 or free returns.
Delivery Information
Orders placed before 12:00pm (UK time) are usually dispatched the same working day. Orders placed after this time will be dispatched on the next working day.
In the rare event of a stock shortage, we will notify you promptly and issue a full refund within one working day if the item cannot be supplied.
Once dispatched, tracking information will be provided via email, provided valid contact details are supplied at checkout.
While we aim to meet all estimated delivery times, delays may occasionally occur due to circumstances beyond our control, such as courier issues, weather conditions, or operational disruptions. Should this happen, we will keep you informed.
Delivery Areas
We currently deliver to:
• United Kingdom
• Republic of Ireland
• Isle of Man
• Jersey & Channel Islands
• Most European destinations
If you are unsure whether we deliver to your location, please contact us prior to placing your order.
Verified UK Entity #15361806 operating from our NW10 London Logistics Hub. Skip the wait with express workshop pickup.

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.
- 31918-K97-T00
_
- PCX125
- 2018
- 2019
- 2020
- Honda
- 125
- A
- PCX125
- NEW
Product Overview
This high-quality Aftermarket Spark Plug MR8K9 (31918-K97-T00) is designed to meet or exceed factory performance standards and is suitable for Honda PCX 125 (2018–2020) models.
The spark plug generates the electrical spark required to ignite the air-fuel mixture inside the engine, supporting smooth combustion, efficient fuel delivery, and reliable everyday performance. Over time, the electrode can wear down while carbon deposits build across the firing tip, weakening spark strength and leading to rough idling, hesitation under acceleration, reduced fuel economy, misfires, and difficult cold starts. This aftermarket replacement is engineered for fit and function, restoring consistent ignition performance, smoother throttle response, and dependable engine operation for your Honda PCX 125.
- Brand New Aftermarket Spark Plug MR8K9
- Part Number: 31918-K97-T00
- Compatible with Honda PCX 125 (2018-2020)
- Restores reliable ignition for smooth and efficient engine performance
- Helps maintain consistent fuel economy, throttle response, and cold-start reliability
- Reduces misfires, rough idling, and hesitation under acceleration
- Engineered for fit and function to match factory ignition specifications
- Direct fit replacement, no modification required
- Recommended replacement during scheduled servicing and routine ignition maintenance
- 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 a worn, fouled, or misfiring spark plug affecting engine performance
• Replacing the Spark Plug MR8K9 (31918-K97-T00) during scheduled servicing or routine maintenance
• Mechanics and workshops carrying out Honda PCX125 engine and ignition system servicing
• Riders wanting to restore smooth ignition performance, fuel efficiency, and reliable cold starts
• Anyone looking for a high-quality aftermarket replacement for their Honda PCX125 ignition system
Complete Part Guide
The spark plug functions as the critical ignition trigger for the Honda PCX125 2018-2020, converting electrical energy into the spark needed for combustion. A fouled or corroded plug results in stuttering acceleration, increased emissions, and frustrating starting issues especially in cold weather. This premium Honda aftermarket spark plug replacement MR8K9 (31918-K97-T00) provides the heat range and durability required for heavy London use. Directly shipped from Part Hive's London warehouse, we provide same-day UK dispatch for all orders before 1 PM.
We frequently see 2018-2020 Honda PCX-125s coming in with erratic idle or sluggish pull-away from lights, often traced to a worn spark plug. Once the electrode erodes or carbon builds up, combustion becomes inconsistent, leading to hesitation and misfires. In damp conditions, degraded plugs can make starting less reliable. This performance-grade, Honda aftermarket MR8K9 (31918-K97-T00) spark plug is the correct specification for these models, with the proper reach and thread pitch to protect the cylinder head. Built to handle the thermal stress of city traffic, fitting a fresh plug helps restore dependable ignition and smoother throttle response during daily commuting.
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