Spark plugs

Marine spark plugs for boat engines

Marine spark plugs are important components in the ignition system of boat engines. They ensure the ignition of the fuel-air mixture in the engine and enable reliable starting and stable engine performance. In this category you will find spark plugs for outboards and marine engines that are used for maintenance, service and the reliable operation of boat drives.

Mercruiser spark plugs - guide & selection aid

Spark plug BR4HS from NGK
Spark plug BR4HS from NGK
article nr.04534
13,57 EUR / Piece
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
Spark plug BR7HS-10 from NGK
Spark plug BR7HS-10 from NGK
article nr.04540

Mercruiser: 33-41263M Yamaha: 94702-00271

13,14 EUR / Piece
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
Spark plug BZ7HS10 from NGK
Spark plug BZ7HS10 from NGK
article nr.04547
16,10 EUR / Piece
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
Spark plug Cr6Hsa
NGK
Spark plug Cr6Hsa
article nr.NGKCR6HSA

Suitable for the following models: DF2.5, DF6

12,42 EUR / Piece
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
Spark plug LFR6A-11 from NGK
Spark plug LFR6A-11 from NGK
article nr.04558
10,84 EUR / Piece
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
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  • Over 15 years’ experience in the marine spare parts trade
    Over 15 years’ experience in the marine spare parts trade
  • Official Mercury & MerCruiser dealer
    Official Mercury & MerCruiser dealer
  • A wide range of boat engine spare parts from A to Z
    A wide range of boat engine spare parts from A to Z
  • Spare parts for Volvo Penta, MerCruiser, Yamaha, Honda, Suzuki and more
    Spare parts for Volvo Penta, MerCruiser, Yamaha, Honda, Suzuki and more
  • Fast delivery for maintenance, servicing and repairs
    Fast delivery for maintenance, servicing and repairs
  • Order boat spare parts conveniently online 24/7
    Order boat spare parts conveniently online 24/7

Marine spark plugs for outboards and boat engines

Spark plugs are a central component of a boat engine's ignition system. They generate the electrical spark that ignites the fuel-air mixture in the cylinder and thus starts the combustion process in the engine. A functioning spark plug is crucial for a reliable engine start and stable engine performance.

Marine spark plugs are specially developed for use in boat engines and must be able to withstand high temperatures, vibrations and moisture.

Functions of a spark plug in a boat engine

The spark plug fulfills several important functions in engine operation:

  • Generation of an electrical ignition spark

  • Ignition of the fuel-air mixture in the cylinder

  • Supporting stable engine running

  • Ensuring an efficient combustion process

A correctly functioning spark plug ensures that the engine runs smoothly and can help to reduce fuel consumption and emissions.

Spark plugs for different boat engines

Marine spark plugs are used in many different boat engines, including

  • Outboard engines

  • Inboard engines

  • Jet ski engines

  • Generators and auxiliary engines

Different spark plug types are used depending on the engine manufacturer and engine series. Many well-known manufacturers of marine spark plugs include NGK, Champion and Denso.

Maintenance and replacement of marine spark plugs

Spark plugs are one of the typical maintenance and wear parts of a boat engine. Deposits, wear or incorrect electrode gaps can impair the function of the spark plug and lead to starting problems or loss of power.

Many manufacturers therefore recommend regular inspection and replacement of the spark plugs as part of engine maintenance.