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  • NGK 7421 BMR6A Nickel Spark Plug
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NGK 7421 BMR6A Nickel Spark Plug
NGK 7421 BMR6A Nickel Spark Plug
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NGK 7421 BMR6A Nickel Spark Plug

NGK
ELE2203
In stock
$2.94 $2.75
Description The NGK BMR6A (Stock #7421) is a compact, resistor-type nickel spark plug designed primarily for...
$2.75
NGK 7421 BMR6A Nickel Spark Plug
Description

Description

The NGK BMR6A (Stock #7421) is a compact, resistor-type nickel spark plug designed primarily for small engines, lawn & garden equipment, and industrial applications. Built with a copper core, nickel electrode, and 0.7 mm gap, it delivers reliable ignition, efficient heat dissipation, and consistent performance in smaller displacement engines.

Key Features

  • Standard nickel spark plug for dependable everyday use
  • Copper core improves heat transfer and engine efficiency
  • 10k ohm resistor helps reduce electrical interference (RFI)
  • Removable terminal nut for compatibility with different plug wire types
  • Trivalent metal plating resists corrosion and seizure
  • Corrugated ribs prevent flashover
  • Triple sealing system helps prevent combustion leakage
  • Designed for small engine / utility equipment, not automotive use

Specifications

General

  • Part Number: BMR6A
  • Stock Number: 7421
  • Brand: NGK
  • Plug Type: Nickel
  • Heat Range: 6
  • Resistor: Yes
  • Resistor Value: 10k Ohm
  • Gap: 0.028" (0.7 mm)
  • Longevity: ~30,000 miles / typical service interval equivalent
  • Warranty: 60 Days

Shell

  • Thread Diameter: 14 mm
  • Thread Pitch: 1.25 mm
  • Seat Type: Gasket
  • Reach: 9.5 mm (3/8")
  • Hex Size: 3/4" (19 mm)
  • Terminal Type: Removable Nut
  • Overall Height: Bantam (short/compact design)

Center Electrode

  • Material: Nickel
  • Type: Standard
  • Size: 2.5 mm
  • Projection: Non-Projected

Ground Electrode

  • Material: Nickel
  • Type: Standard
  • Quantity: 1

Torque Specs

  • Cast Iron: 18–25.3 lb-ft
  • Aluminum: 18–21.6 lb-ft

Fitment Overview

Not intended for automotive or powersports vehicles

Primary Applications:

  • Commercial & Industrial Engines
    • Homelite FP250
    • Subaru-Robin EC13V
  • Lawn & Garden Equipment
    • Tanaka hedge trimmers and brush cutters
      • TBC-225, TBC-245, TBC-260, TBC2500
      • TBC-2501, TBC-270, TBC290, TBC340PF/D, TBC250PF/D

Performance Notes

  • Designed specifically for small displacement engines and handheld equipment
  • The short 9.5 mm reach and compact design make it unsuitable for most automotive engines
  • Always verify OEM plug spec and gap before installation
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Shipping

Order Processing
All orders are processed and shipped within 24 hours of purchase (excluding weekends and holidays).
Orders placed after 3:00 PM EST may ship the following business day.

Shipping Methods
Customers select their preferred shipping method and speed at checkout.
Shipping times are determined by the carrier and cannot be guaranteed by us.
Tracking information will be provided once your order has shipped.

Shipping Coverage
If your package arrives damaged, please notify the delivery driver immediately and contact the shipping carrier to file a claim.
You must report any missing or damaged items within 14 days of delivery.
After this time, we cannot be held responsible for lost or damaged items.

Returns

Return Window
You have 30 days from the date of delivery to request a return.
After 30 days, we are unable to accept returns, exchanges, or refund requests.

Eligibility
Items must be returned in their original condition—unused, unwashed, and with all tags and packaging intact.
Certain products may not be eligible for return (e.g., special-order items, customized products, or perishable goods).
Items that have been altered, installed, or modified cannot be returned.

Return Process
Contact our Customer Support team to request a Return Authorization (RMA) before sending items back.
Once your return is approved, you’ll receive instructions on where to send the product.
Customers are responsible for return shipping costs unless the item was defective or incorrect.

Refunds
Refunds are issued to the original payment method once the returned item has been received and inspected.
Please allow 5–10 business days for the refund to appear on your account.
In some cases, a restocking fee may apply (if applicable, this will be disclosed during your return authorization).

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