Description
Quicksilver NGK BPR6EFS Standard Spark Plug, 1-Pack (816336Q)
Restore clean starts and reliable performance with the OEM-specified NGK BPR6EFS marine spark plug. This Quicksilver 816336Q plug arrives pre-gapped to engine manufacturer specs and uses a copper core and trivalent anti-corrosion plating for strong spark energy, heat dissipation, and easier removal in harsh marine environments.
Applications
- Fits 1998–2001 MerCruiser 3.0L, 4.3L, 5.0L, 5.7L & 7.4L engines
- Use only where NGK BPR6EFS is specified by your engine’s owner’s/service manual
- Not a universal substitute—verify part number before installation
Shipping & Returns
Fast shipping from Wisconsin with reliable carriers. Need help verifying compatibility by engine model/serial? We’re happy to assist. Returns are easy—see our Return Policy.
Key Facts
- Brand: Quicksilver
- Part #: 816336Q (Supersedes 816336)
- Plug Type: NGK BPR6EFS
- Core: Copper core for improved heat dissipation
- Coating: Trivalent metal plating for marine corrosion resistance and anti-seizing
- Gap: Pre-gapped to engine manufacturer specification (verify before install)
- Terminal: Removable terminal
- UPC: 087295176184
- Store Category: Parts > Spark Plugs
- Prop 65: No
What’s Included
- 1 × NGK BPR6EFS standard spark plug (Quicksilver P/N 816336Q)
Service Notes
- Replace all plugs at the same time for even ignition performance
- Check and adjust gap to spec before install; use a wire-type gap tool
- Thread in by hand first; torque to the value in your service manual—do not over-tighten
- Plated threads typically do not require anti-seize; follow NGK/engine manual guidance
- Inspect boots and leads for wear; correct any misfire sources before running