---
product_id: 75211275
title: "Arnold Champion 3121-C5-0031 Spark Plug RC12YC for 4 Stroke Engine"
brand: "arnold"
price: "€ 18.26"
currency: EUR
in_stock: true
reviews_count: 5
url: https://www.desertcart.hr/products/75211275-arnold-champion-3121-c5-0031-spark-plug-rc12yc-for-4
store_origin: HR
region: Croatia
---

# Precision ignition boost Optimized for 4-stroke engines Compact & lightweight design Arnold Champion 3121-C5-0031 Spark Plug RC12YC for 4 Stroke Engine

**Brand:** arnold
**Price:** € 18.26
**Availability:** ✅ In Stock

## Summary

> ⚡ Spark your engine’s potential — don’t get left in the cold start line!

## Quick Answers

- **What is this?** Arnold Champion 3121-C5-0031 Spark Plug RC12YC for 4 Stroke Engine by arnold
- **How much does it cost?** € 18.26 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/75211275-arnold-champion-3121-c5-0031-spark-plug-rc12yc-for-4)

## Best For

- arnold enthusiasts

## Why This Product

- Trusted arnold brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Precision Fit:** Dimensions tailored (9 x 0.05 x 21 cm) for seamless integration with your engine setup.
- • **Fuel Your Drive:** Designed for benzin-powered engines, delivering consistent combustion efficiency.
- • **Light as a Feather:** Weighing only 50g, this spark plug adds minimal weight while maximizing performance.
- • **Ignite with Confidence:** Engineered for reliable spark delivery in 4-stroke engines, ensuring smooth startups every time.
- • **Single Power Performer:** Comes as a single unit, perfect for targeted replacements or upgrades.

## Overview

The Arnold Champion 3121-C5-0031 Spark Plug RC12YC is a lightweight, precision-engineered ignition component designed specifically for 4-stroke benzin-powered engines. With compact dimensions and reliable spark delivery, it ensures efficient combustion and smooth engine performance, making it an essential upgrade for professionals seeking dependable power.

## Description

Arnold Champion 3121-C5-0031 Spark Plug RC12YC for 4 Stroke Engine

## Features

- Spark Plug Champion RC12YC
- for four stroke engines.
- The manufacturer numbers provided serve only for comparison with other products. Unless otherwise stated, we do not deliver original parts.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Arnold |
| Part Number | 3121-C5-0031 |
| Product Dimensions | 9 x 0.05 x 21 cm; 50 g |
| Item model number | 3121-C5-0031 |
| Power Source | Benzinbetrieben |
| Item Package Quantity | 1 |
| Number of Pieces | 1 |
| Included Components | Spark plug |
| Batteries included? | No |
| Batteries Required? | No |
| Item Weight | 50 g |

## Product Details

- **Brand:** ARNOLD
- **Core material:** Copper Alloy
- **Thread size:** 14mm
- **Top material type:** Ceramic
- **Vehicle service type:** Motorcycle

## Images

![Arnold Champion 3121-C5-0031 Spark Plug RC12YC for 4 Stroke Engine - Image 1](https://m.media-amazon.com/images/I/51yugdNxz+L.jpg)
![Arnold Champion 3121-C5-0031 Spark Plug RC12YC for 4 Stroke Engine - Image 2](https://m.media-amazon.com/images/I/71ovX2R+HyL.jpg)
![Arnold Champion 3121-C5-0031 Spark Plug RC12YC for 4 Stroke Engine - Image 3](https://m.media-amazon.com/images/I/51LK1fcBCOL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ 







  
  
    Original
  

*by P***S on Reviewed in the United Kingdom on 15 March 2022*

The champion spark plug is the original used on my lawnmower and I wouldn’t used any other cheaper alternative. The spark plug has a good long lifespan and can be easily cleaned  for a better performance.

### ⭐⭐⭐⭐⭐ 







  
  
    Mower Spark Plug.
  

*by B***. on Reviewed in the United Kingdom on 15 April 2021*

Its a spark plug for my mower, and it works perfectly... it started first time...

### ⭐⭐⭐⭐⭐ 







  
  
    Works well
  

*by B***P on Reviewed in the United Kingdom on 9 April 2021*

Does as it says on the box.

---

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**Shop now:** [https://www.desertcart.hr/products/75211275-arnold-champion-3121-c5-0031-spark-plug-rc12yc-for-4](https://www.desertcart.hr/products/75211275-arnold-champion-3121-c5-0031-spark-plug-rc12yc-for-4)

---

*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-01-31*