FREE SHIPPING ON ORDERS OVER $199

1 1

Champion Spark Plugs

Spark Plug 304

Spark Plug 304

SKU:CHA-RS9YC

$3.99 USD

$3.99 USD

Sale Sold out

Shipping calculated at checkout.

19 in stock

Quantity

Earn 3 Boat Points Learn More
Free Shipping on orders over $199 Learn More

Champion RS9YC Copper Plus Marine Spark Plug

Champion marine spark plugs are quality OEM replacements. The Champion RS9YC Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. These marine spark plugs are designed to resist overheating under heavy engine loads.

Built to ISO and SAE standards for proven performance.

Champion Spark Plug # 304

Features

Copper Plus for dependable performance
Copper core electrode allows for accurate control of heat range for longer life
Patented TinTac and ULTRASEAL coated shell for maximum corrosion resistance
Patented SAC-9 semiconductor for maximum EMI & RFI suppression.

View full details

Blog posts

Best Fiberglass Cutting Tools for Clean Edges: WBT vs WBT2

Buyer's Guides Tools & Techniques

11 September 2026

Best Fiberglass Cutting Tools for Clean Edges...

11 September 2026

Best Fiberglass Cutting Tools for Clean Edges...

Kevlar Fabric for Boats: A Fabricator's Guide to Choosing the Right Aramid Cloth

Boat Building & Projects Buyer's Guides Carbon Fiber & Kevlar

21 August 2026

Kevlar Fabric for Boats: A Fabricator's Guide...

21 August 2026

Kevlar Fabric for Boats: A Fabricator's Guide...

Resin Mixing Mistakes That Ruin Your Composite Project (And How to Avoid Them)

Repair & Maintenance Resin & Epoxy Systems Tools & Techniques

18 August 2026

Resin Mixing Mistakes That Ruin Your Composit...

18 August 2026

Resin Mixing Mistakes That Ruin Your Composit...