Yamaha Spark Plug Cap Assembly - 663-82370-01-00
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Yamaha Spark Plug Cap Assembly
Keep your outboard's ignition system firing cleanly with this OEM Yamaha Spark Plug Cap Assembly (Part No. 663-82370-01-00). Designed as a direct replacement for Yamaha outboard engines, this cap assembly seals the connection between the spark plug wire and plug, protecting against moisture, vibration, and electrical interference — all common challenges in the marine environment.
A worn or cracked plug cap can cause misfires, hard starting, and rough idle. Replacing it with a genuine OEM part restores reliable ignition performance and helps protect your coil and plug wire from premature wear.
Key Features
- OEM Yamaha replacement — direct fit, no modification required
- Seals against moisture and salt spray
- Reduces electrical interference for consistent spark delivery
- Durable construction suited to marine operating conditions
Compatible Spark Plugs
Pair this cap with compatible NGK spark plugs for a complete ignition service:
Related Ignition Components
Parts Desk Insights
Best use case: Recommended when servicing spark plugs on Yamaha outboards — especially during annual tune-ups or when diagnosing misfires and rough running. Inspect the cap for cracks, carbon tracking, or a loose fit whenever plugs are changed. Replacing the cap at the same time as the plugs is a low-cost step that prevents repeat service calls.
Part No.: 663-82370-01-00 | SKU: 663-82370-01-00
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.