NGK Spark Plug - DPR7EA-9
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The NGK DPR7EA-9 is a standard resistor spark plug used in select motorcycles, ATVs, scooters, utility engines, and powersports applications where the manufacturer specifies the DPR7EA-9 / NGK 5129 plug profile. It uses copper-core nickel construction, a built-in resistor, a projected insulator nose, and a 12 mm gasket-seat body for dependable ignition service in compatible engines.
This plug should be installed only where the engine service manual, equipment label, or factory application chart specifically calls for NGK DPR7EA-9, NGK 5129, or an approved equivalent.
Key Features
- Genuine NGK standard spark plug.
- NGK part number: DPR7EA-9.
- NGK stock number: 5129.
- Copper-core nickel construction for standard service applications.
- Built-in resistor to help reduce ignition-related RFI noise.
- Projected insulator nose design.
- Thread diameter: 12 mm.
- Thread reach: 19 mm / 3/4 in.
- Hex size: 18 mm.
- Seat style: flat / gasket seat.
- Heat range: 7.
- Factory preset gap reference: 0.036 in. / 0.9 mm.
- Terminal style: threaded stud / removable terminal nut, depending on ignition cap requirement.
- Powersports distributor catalog formatting may appear as 41-DPR7EA9.
Application Compatibility
Common application context includes select engines where the factory plug chart calls for NGK DPR7EA-9 / 5129, including:
- Select Yamaha Royal Star / Royal Star Tour Classic / Venture XVZ1300 applications where specified.
- Select Yamaha cruiser and powersports applications where specified.
- Select Honda ATV and cruiser motorcycle applications where specified.
- Select Kawasaki, Suzuki, Harley-Davidson, KYMCO, and Triumph powersports applications where the manufacturer lists the DPR7EA-9 plug profile.
- Select utility-engine or specialty small-engine applications where the service chart confirms DPR7EA-9 / 5129.
Use this spark plug only where the manufacturer's application chart lists DPR7EA-9, 5129, or an approved equivalent.
Fitment Notice
Confirm fitment by exact year, make, model, engine size, serial number, service manual, and spark plug chart before ordering. Spark plugs with the same thread diameter can still differ in reach, heat range, seat style, terminal type, resistor design, projection, and required gap. Installing the wrong plug can cause hard starting, misfire, poor idle, overheating, thread damage, piston contact, or ignition-system issues.
When This Part Needs Replacement
Replace spark plugs during scheduled tune-up service or whenever the plug is worn, fouled, fuel-soaked, oil-contaminated, cracked, corroded, damaged, or causing hard starting, rough idle, hesitation, misfire, weak acceleration, or poor throttle response. Powersports engines that idle frequently, operate in wet or dusty conditions, or sit in seasonal storage should have plugs inspected regularly.
Installation Notes
Check the plug number and required gap before installation. Install into clean, undamaged cylinder head threads and tighten to the engine manufacturer's torque specification for the exact engine. Because this is a gasket-seat plug, confirm the sealing washer is present and seated correctly.
Avoid adding anti-seize unless the engine or spark plug manufacturer specifically calls for it, as thread lubricant can change clamping load and increase the risk of over-tightening in aluminum cylinder heads. Confirm whether the ignition lead requires the removable terminal nut installed or removed before fitting the spark plug cap.
Alternate/Superseded Part Numbers
- NGK DPR7EA-9 — spark plug part number
- NGK 5129 — NGK stock number
- DPR7EA9 — alternate catalog formatting
- 41-DPR7EA9 — powersports distributor catalog formatting
- Honda 98069-57911 — cross-reference; verify by model and plug chart
- Honda 98069-57916 — cross-reference; verify by model and plug chart
- Honda 98069-57916-00 — cross-reference; verify by model and plug chart
- Yamaha 94701-00262 — cross-reference; verify by model and plug chart
- Yamaha 94703-00262 — cross-reference; verify by model and plug chart
- Suzuki 09482-00331-111 — cross-reference; verify by model and plug chart
- Denso X22EPR-U9 / X22EPRU9 — cross-reference; verify by application
- Champion RA6HC / RA8YC — cross-reference; verify by application
Parts Desk Insight
The DPR7EA-9 is a 12 mm, 19 mm reach resistor plug with a projected firing end and 0.9 mm preset gap. It should be matched by exact plug number and application chart, not just by motorcycle, ATV, or engine family. Correct reach, seat style, terminal setup, heat range, and gap are all important for reliable ignition and cylinder-head safety.
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
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.
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