NGK spark plug cr4hsb code: 47.558.15 – Osculati

NGK CR4HSB Osculati spark plug (code 47.558.15)

The NGK CR4HSB spark plug offered by Osculati (supplier code 47.558.15) is a spare part designed for the regular maintenance of engines, with a practical approach focused on reliability in nautical use. In a technical sheet or maintenance plan, the spark plug is often an underestimated component: in reality, it directly affects the smooth operation and quality of ignition, especially when the engine operates under typical navigation conditions (humidity, salt spray, prolonged stops).

This version CR4HSB is indicated as the standard spark plug fitted on various brands of outboard and engines: Mariner, Yamaha, Suzuki, Mercury, Tohatsu, Selva and Honda. For a correct choice, it is always advisable to verify the spark plug code provided by the engine manufacturer or the workshop manual, comparing it with the code on the installed spark plug.

Product features and details

Identification and codes

• Spark plug model: NGK CR4HSB
• Osculati Code: 47.558.15
• Supplier: Osculati S.r.l.

These references are useful for quick reorders, spare parts management on board, and to avoid mistakes when making repeated purchases or preparing a seasonal maintenance kit.

Information on original equipment (OE)

According to available information, the spark plug is indicated as standard fitted on engines of various brands: Mariner, Yamaha, Suzuki, Mercury, Tohatsu, Selva and Honda. This data is particularly useful when looking for a “factory equivalent” spare part and wanting to maintain the same type of spark plug already specified by the manufacturer.

Typical applications in the nautical field

The NGK CR4HSB spark plug is a spare part used in maintenance and restoration contexts on outboard and similar engines, where correct ignition is essential for smooth operation. In particular, it can be considered in these situations:

• Scheduled maintenance before the season or after storage periods.
• Preventive replacement when you want to restart with a component in good condition, reducing the risk of issues related to wear or deposits.
• Diagnostic interventions on irregular operation: the spark plug is one of the first elements to check in case of difficult starting or uneven running.
• Onboard spare parts kit: a compact and useful component to keep on board as a spare, especially during navigation or transfers.

Since the mentioned engines include various brands, verifying the exact code remains the key step: the same engine family may have variants and different codes depending on model and year.

Practical advantages for maintenance and spare parts management

Simple choice thanks to code and number

The presence of a unique code (CR4HSB) and the Osculati code 47.558.15 makes the supply of the spare part more streamlined, especially when managing multiple engines or placing recurring orders. In a professional context (workshop, storage, maintenance), this helps reduce time and the possibility of errors.

Spare part oriented to real use on board

In boating, maintenance often takes place in confined spaces and within limited time frames. A correct spark plug, replaced methodically, helps keep the engine in conditions consistent with its intended use. Without going into unavailable specifications, it is useful to remember that a spark plug in good condition promotes smoother ignition and more orderly management of routine interventions.

Installation indication on multiple brands

The fact that it is indicated as factory-installed on Mariner, Yamaha, Suzuki, Mercury, Tohatsu, Selva and Honda is an informative advantage: it helps to orient oneself when working on widespread engines and wanting to maintain a configuration consistent with the original. Even in this case, confirmation through the manual or existing spark plug remains the best practice.

Usage and operational notes

Check before purchase

To avoid incompatibilities, always check:

• the abbreviation shown on the currently installed spark plug;
• the engine manual or the manufacturer's instructions;
• any technical notes from the workshop or maintainer.

If your current spark plug bears the code CR4HSB, this product is the most direct choice. If instead you are starting from a different code, it is preferable not to proceed by “trial and error” and confirm the match with official sources.

Good practices when replacing

During the replacement of a spark plug, some general precautions help to work in an orderly manner:

• operate with the engine off and in safe conditions;
• clean the area around the spark plug seat to limit dirt ingress;
• check the condition of the removed spark plug (deposits, wear, any abnormal signs) as useful information for maintenance;
• tighten according to the instructions of the engine or spark plug manufacturer (if available).

and rewiring, when it is necessary to maintain the same type of connector.

For those who sail regularly, it can be useful to organize a small stock of spare parts subject to replacement. The spark plug is an element well suited to be kept as a spare, provided it is stored properly and clearly identified (for example by reporting CR4HSB and 47.558.15 on the container or in the onboard spare parts list).

Note: this sheet exclusively describes the available information (code, number and installation indication on certain brands). For any compatibility doubts about your specific engine model, it is advisable to check with the manual, workshop, or specialized spare parts dealer.

FAQ – Frequently Asked Questions

What is the Osculati code for this NGK spark plug?

The Osculati product code associated with this spark plug is 47.558.15.

What is the spark plug code/model?

The model code is NGK CR4HSB.

On which engine brands is it indicated as factory-installed?

It is listed as standard on Mariner, Yamaha, Suzuki, Mercury, Tohatsu, Selva, and Honda.

Are Champion matches available for this model?

In the available information, the entry “Champion Matches” is not indicated (marked as “-”). For cross replacements, it is advisable to consult official tables.

How do I check if it is the right spark plug for my engine?

Check the code on the spark plug currently installed or consult the engine manual. If the required code is CR4HSB, this product is the correct one.