Description

Original NGK spark plug, highly reliable technical reference for garden equipment and outdoor machinery engines. Specifically designed for 4T engines, it has a short neck and thermal grade 4. Its technical measurements are: thread diameter 14 mm, thread length 9.5 mm, 21 mm hexagonal and flat seat. Technical equivalence with reference 4133, which facilitates its direct replacement in compatible engines. A spark plug in good condition guarantees quick starting, efficient combustion and lower fuel consumption. It is recommended to check and replace periodically according to the hours of use of the equipment and whenever starting problems or loss of power are detected. Presentation: spark plug unit. NGK spark plug model BR4-LM (number 4133) for 4T short neck engines.

Features

Application

In engines that respect the characteristics of the spark plug

Includes

Spark plug unit

Presentation

Box

Spark plug type

4T

Neck

Short

Thermal degree

4

Thread diameter

14 mm

Hexagonal diameter

21 mm

Thread length

9.5 mm

Seat

Flat

Equivalence

4133

Other spare parts that might interest you

Our latest reviews on Google

4.9/5 (433 customer reviews on Google)

Frequently Asked Questions

What is this spark plug for?

Spark plug model NGK BR4-LM (4133). It is a spark plug designed for 4T engines of garden equipment. It is responsible for generating the spark that ignites the air-fuel mixture inside the combustion chamber, an essential condition for the engine to function correctly. It is equivalent to reference 4133, so you can replace your current spark plug if it matches the measurements and thermal rating.

How do I know if this spark plug is compatible with my engine?

To ensure compatibility, you must check that your engine accepts a spark plug with these measurements: 14 mm thread diameter, 9.5 mm thread length, flat seat and short neck. If your team originally mounts a spark plug with another reference, always verify that the measurements and thermal rating match before replacing it.

What does the heat rating of this spark plug mean?

This spark plug has a thermal grade of 4. The thermal grade indicates the ability of the plug to dissipate heat: a higher grade dissipates more heat and is used in engines that work at high speeds, while a lower grade retains more heat and is suitable for engines that work at lower revolutions. It is important to respect the thermal rating recommended by the manufacturer of your engine.

Does it have a long or short neck?

It has a short neck. The short neck is used in engines whose combustion chamber is designed to accommodate the spark plug thread at a shallow depth. If you install a spark plug with the wrong collar, you can damage the piston or prevent it from sparking properly.

How often should a spark plug be changed?

As a general rule, spark plugs in garden equipment engines should be replaced at least once per season or every 50-100 hours of use, although it depends on the type of equipment and the quality of the fuel. Change it sooner if you notice starting problems, loss of power, increased consumption, white smoke or if you see worn, deformed electrodes or black deposits that are not easily cleaned.

What is the technical equivalence of this spark plug?

Its technical equivalence is 4133. If your original spark plug has this reference or a compatible equivalent, you can replace it with this model without problem. Before changing it, write down the reference of the current spark plug to always have the correct replacement on hand.

Contact us and we’ll help you find your spare part.

Our headquarters are in Madrid, but we have a network of more than 150 workshops across Spain, Italy, and Portugal.

Technical Services