# 338M0204737 Mercury MerCruiser 8M0135348 Spark Plugs | Genuine Quicksilver OEM Part

🔧 Product Description

  

Genuine Quicksilver NGK LKAR7C-9 Spark Plug - Part Number: 33-8M0204737

  

A genuine Quicksilver-supplied NGK LKAR7C-9 spark plug used on new-generation Mercury V6 and V8 FourStroke outboards. This spark plug replaces the earlier 33-8M0135348 reference and is designed for correct ignition performance in modern high-output Mercury outboard engines.

  

⚙️ Key Features

  

• Genuine Quicksilver OEM spark plug

• Correct Mercury part number 33-8M0204737

• NGK LKAR7C-9 spark plug specification

• Supersedes earlier 33-8M0135348 spark plug reference

• Used on selected Mercury V6, V8, Verado, Pro XS, Racing and high-output FourStroke applications

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 33-8M0204737 → Supersedes 33-8M0135348

• 8M0204737 → Supersedes 8M0135348

• 8M0135348 earlier OEM spark plug reference

  

OEM / Related Numbers:

  

• 33-8M0204737

• 8M0204737

• 338M0204737

• 33-8M0135348

• 8M0135348

• LKAR7C-9

• NGK LKAR7C-9

• 93961

  

Aftermarket / Verified Equivalents:

  

• NGK: LKAR7C-9

• No additional aftermarket equivalent

  

🚤 Compatibility

  

Commonly used on:

  

• Mercury V6 and V8 FourStroke outboard ignition systems

  

Typically suits:

  

• Engine models:

• Mercury 175HP 3.4L V6 FourStroke - serial 2B529482 and up

• Mercury 175HP 3.4L V6 Pro XS FourStroke - serial 2B529482 and up

• Mercury 175HP 3.4L V6 SeaPro FourStroke - serial 2B529482 and up

• Mercury 200HP 3.4L V6 FourStroke - serial 2B529482 and up

• Mercury 200HP 3.4L V6 Pro XS FourStroke - serial 2B529482 and up

• Mercury 200HP 3.4L V6 SeaPro FourStroke - serial 2B529482 and up

• Mercury 225HP 3.4L V6 FourStroke - serial 2B529482 and up

• Mercury 225HP 4.6L V8 FourStroke - serial 2B529482 and up

• Mercury 225HP 4.6L V8 Verado FourStroke - serial 2B529482 and up

• Mercury 250HP 4.6L V8 FourStroke - serial 2B529482 and up

• Mercury 250HP 4.6L V8 Pro XS FourStroke - serial 2B529482 and up

• Mercury 250HP 4.6L V8 SeaPro FourStroke - serial 2B529482 and up

• Mercury 250HP 4.6L V8 Verado FourStroke - serial 2B529482 and up

• Mercury 300HP 4.6L V8 FourStroke - serial 2B529482 and up

• Mercury 300HP 4.6L V8 Pro XS FourStroke - serial 2B529482 and up

• Mercury 300HP 4.6L V8 SeaPro FourStroke - serial 2B529482 and up

• Mercury 300HP 4.6L V8 Verado FourStroke - serial 2B529482 and up

• Mercury Racing 300R V8 FourStroke applications using LKAR7C-9

• Mercury Racing 400R / 450R V8 FourStroke applications where 33-8M0204737 is specified

  

• HP Range: commonly 175HP - 450HP where specified

• Engine Type: Mercury V6 / V8 FourStroke outboard

• System Type: Ignition / spark plug

  

🔌 Function

  

The spark plug ignites the compressed fuel-air mixture in the combustion chamber, supporting clean combustion, reliable starting and smooth engine operation.

  

Common signs of failure:

  

• Hard starting

• Misfire under load

• Rough idle

• Reduced fuel economy

• Fouled, worn or incorrectly gapped spark plug electrode

  

📦 Condition

  

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 25.9 AUD
- **Vendor:** Quicksilver
- **Tags:** Quicksilver Marine Parts | Oils Service Kits & Engine Components

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 25.90 AUD | In stock |

## Images

- 338M0204737 Mercury MerCruiser 8M0135348 Spark Plugs | Genuine Quicksilver OEM Part

---

> Source: [Sawley's Auto and Marine](www.sawleysautoandmarine.com.au/products/338m0204737-mercury-mercruiser-8m0135348-spark-plugs-genuine-quicksilver-oem-part)
> Updated: 2026-05-17