NGK Spark Plug - BP4H
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Product Information
Full details
The NGK BP4H spark plug is a high-quality, reliable component designed for automotive and small engine enthusiasts looking for consistent ignition performance. It is an ideal choice for standard internal combustion engines requiring a 14mm thread diameter, offering a durable nickel electrode and a robust gasket seat. While it provides excellent engine starting reliability and smooth operation, users should note that this specific model lacks built-in interference suppression, making it best suited for applications where electronic noise is not a primary concern.
All features
| Model Part Number | BP4H |
|---|---|
| Brand | NGK |
Extended Product Information
FAQs
Does the BP4H come pre-gapped?
While these plugs are generally close to a standard gap, you should always check the gap with a gauge to match your specific engine requirement before installation.
Can I use this in an engine that requires a resistor plug?
It is not recommended. If your engine requires a resistor plug for interference suppression, using a non-resistor plug like the BP4H could interfere with sensitive electronics or radio equipment.
What is the thread size for this plug?
The BP4H features a 14.0 mm outer thread diameter.
Is the SAE connector removable?
Yes, the SAE connector is unscrewable, allowing for compatibility with both solid-post and threaded-stud ignition wires.
What tool size do I need to install this?
You will need a 20.8 mm (often referred to as 13/16 inch) spark plug socket.
Troubleshooting
Engine fails to start or experiences misfires
Check the spark plug gap against manufacturer specifications and ensure the ignition wire is securely connected to the SAE terminal.
Excessive carbon buildup on the electrode
This may indicate a rich fuel mixture; check your carburetor or fuel injection system for proper air-fuel ratio tuning.
Engine runs rough or hesitates under load
Verify that the spark plug is tightened to the correct torque and check the ignition coil/magneto for output issues.
Pros and Cons
Pros
- Reliable ignition performance in standard engines
- High-quality nickel electrode construction
- Easy to install with standard 20.8mm tools
- Versatile unscrewable SAE connector
- Excellent seal integrity with included gasket
Cons
- Does not include interference suppression
- Not intended for high-performance electronic ignition systems
- Requires manual gap checking before installation
Setup, Compatibility & Care
To install the BP4H, ensure the engine is completely cool to prevent damage to the cylinder head threads. Use a 20.8 mm spark plug socket to tighten the plug; it is recommended to tighten it until the gasket contacts the seat, then add an additional 1/2 to 3/4 turn. Always verify the gap setting with a feeler gauge to meet your specific engine manufacturer's specifications. Periodic inspection every 3,000 to 5,000 miles (or seasonal check for small engines) is advised. Look for carbon buildup or electrode erosion; if the electrode appears rounded or pitted, it is time for a replacement.