NGK BPR4ES Spark Plug (6578)

The NGK BPR4ES (stock #6578) is a 14 mm replacement spark plug trusted for reliable starts and a consistent spark. Its hotter heat range, projected tip and built-in resistor make it a popular choice for small engines, generators and equipment that runs at lower speeds and loads, where a hotter plug helps resist fouling.

Features

• Hotter heat range to help burn off deposits in lower-load engines
• Projected insulator tip for improved ignitability and anti-fouling
• Built-in resistor to suppress electrical noise
• Trivalent metal plating for excellent anti-corrosion and anti-seizing properties
• Copper core for efficient heat transfer

Specifications

• Brand: NGK
• Part number: BPR4ES
• Stock number: 6578
• Thread diameter: 14 mm
• Thread reach: 19 mm (3/4")
• Hex size: 13/16" (20.6 mm)
• Heat range: 4
• Resistor: Yes

Fitment

Always confirm the correct spark plug for your engine using your owner's manual or the part number on your existing plug. Check and set the electrode gap to your equipment manufacturer's specification before installing.