NGK B8S Spark Plug 3810 - Standard Copper Core for Evinrude, Johnson, Wizard Outboard Engines 1951-1973

The NGK B8S spark plug, stock number 3810, is a standard NGK spark plug built as an OE cornerstone with decades of proven reliability behind its design. It uses a solid copper core center electrode with a nickel tip, giving it superior heat dissipation, strong conductivity, and a broad heat range for consistent combustion. The ground electrode uses a standard configuration in nickel, and the whole plug is treated with corrosion-resistant plating so it threads in and comes back out easily, even after seasons of exposure to a marine or outdoor environment. Electrically, it is rated at 1 Ohm resistance.

The NGK B8S (3810) is fitted to a specific range of outboard engines and small equipment: Evinrude outboards (1951-1973), Johnson outboards (1957-1973), Sears outboards, and Wizard outboards (1966-1971), as well as Craftsman (Sears) and Pioneer chainsaws, Pioneer generators, and International farm engines. Always check your engine or equipment's original maintenance manual to confirm this is the correct plug before installing, since the wrong plug can reduce performance, hurt fuel economy, or damage the engine.

Specifications

• Brand: NGK
• Manufacturer Part Number: 3810
• NGK Catalog Part Number: B8S
• Resistance: 1 Ohm
• Ground Electrode Configuration: Standard
• Ground Electrode Core Material: Nickel
• Center Electrode Core Material: Copper
• Center Electrode Tip Material: Nickel
• Thread Size: 14 millimeters
• Weight: 0.15 pounds
• UPC: 087295138106

Fitment

• Outboard - Evinrude, 1951-1973
• Outboard - Johnson, 1957-1973
• Outboard - Sears
• Outboard - Wizard, 1966-1971
• Chainsaw - Craftsman (Sears)
• Chainsaw - Pioneer
• Generator - Pioneer
• Farm engine - International

Frequently Asked Questions

What engines does the NGK B8S spark plug (stock number 3810) fit? The NGK B8S spark plug, stock number 3810, fits outboard engines including Evinrude (1951-1973), Johnson (1957-1973), Sears, and Wizard (1966-1971), plus Craftsman (Sears) and Pioneer chainsaws, Pioneer generators, and International farm engines.

What is the electrical resistance of this spark plug? 1 Ohm - the NGK B8S (3810) is a standard, low-resistance design rated at 1 Ohm.

What is the center electrode made from? Copper. The NGK B8S spark plug (3810) has a solid copper core center electrode with a nickel tip for improved heat dissipation and conductivity.

Is the ground electrode standard or a projected design? Standard. The NGK B8S (3810) uses a standard ground electrode configuration made of nickel.

Does the NGK B8S have corrosion-resistant plating? Yes, the NGK B8S (3810) is treated with corrosion-resistant plating so it threads in and out easily even after repeated installs and removals.

Will the NGK B8S fit a chainsaw or generator? Yes - beyond outboard engines, the NGK B8S (3810) fits Craftsman (Sears) and Pioneer chainsaws as well as Pioneer generators.

Does the NGK B8S fit farm equipment? Yes, the NGK B8S spark plug (3810) is listed to fit International farm engines.

How do I know this is the correct plug for my engine? Check your engine or equipment's original maintenance manual for the specified plug type before installing the NGK B8S (3810); using the wrong plug can reduce performance, hurt fuel economy, or damage the engine.

What is the UPC for this spark plug? 087295138106 is the UPC for the NGK B8S spark plug, stock number 3810.

How much does the NGK B8S spark plug weigh? 0.15 pounds - a single NGK B8S plug (3810) is light enough that shipping weight is minimal.

Is this a genuine NGK part or an aftermarket copy? The NGK B8S (3810) is a genuine NGK standard spark plug built to original-equipment specifications, not an aftermarket copy.

What thread size does the NGK B8S use? 14 millimeters is the thread size for the NGK B8S spark plug, stock number 3810.