NGK Spark Plug CMR6H 3365

Product Information

Excessively rich air-fuel mixtures can cause the plug tip temperatures to decrease and carbon deposits to accumulate, possibly causing fouling and misfires. One of the most misunderstood aspects of spark plugs – is the heat range. One misconception is that the heat range is related to the spark temperature or intensity. Another common misconception is that the spark plug is designed as a heat sink to “remove” heat from the combustion chamber. These ideas are both false. The spark plug is heated during combustion and must dissipate that heat to the cylinder head at a certain rate to avoid overheating the ceramic firing end. The spark plug heat range only indicates the rate that the spark plug dissipates its firing end heat to the engine. A colder heat range spark plug may be necessary due to the increased cylinder temperature as boost pressure (manifold pressure) and subsequent cylinder pressure and temperature increase. NGK is the brand leader in the UK spark plug market and are the world's biggest supplier to many major car manufacturers. Each and every one of their products are designed to meet the most rigorous standards and are the professionals' choice because of their quality and technical excellence. Their plugs can be found in use by teams in F1, WRC and MotoGP. Put simply, NGK genuine spark plugs are the workhorse at the heart of smooth-running engines around the world.

As the air temperature or humidity increases, the air density decreases, requiring a leaner air-fuel mixture. If the air-fuel mixture is too rich, decreased performance and/or carbon fouling can result. Stihl: BG56, BG66, BG86, SH56, SH86, BR200, BR500, BR550, BR600, BR700, BT131, FC56, FC70, FC90, FC95, FC100, FC110, FS25, FS40 (Ø10mm Plug engine only), FS50, FS56, FS65, FS70, FS56 (Ø10mm Plug engine only), FS87, FS89, FS90, FS91, FS94, FS100, FS110, FS111, FR130, FS130, FS131, FS240, FS260, FS310, FS311, FS360, FS410, FS460, FS460 C-EM, FR410, FR460, FR480, MS150, MS150 C-E, MS170, MS171, MS180, MS181, MS181 C, MS192 C-E, MS193C, MS193T, MS201, MS211, MS211 C, MS231, MS241, MS251, MS241 C-M, MS362, HT100, 101, 130, 131, KM56, KM90, KM94, KM100, KM111, KM110, KM130, KM131, HL90, HL91, HL94, HL95, HL100, HS81, HS86, HS46, HS46 C-E, HS46, HS56, HS56 C-E, HS81, HS82, HS86, HS87, HT56, HT100, HT101, HT102, HT103, HT130, HT131, HT132, HT133, MS 201 T, MS 201 TC, SH56, SH200, SR200 Advancing ignition timing by 10° will cause the spark plug tip temperature to increase by approximately 70° to 100°C. Spark plugs have been around as long as internal combustion engines have and are often a misunderstood component. This basic guide is designed to assist the technician, hobbyist or race technician in understanding, using and troubleshooting spark plugs. Conversely, if the engine is to be operated at low speeds or at low temperatures for long periods, a hotter heat range might be needed to prevent fouling.

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The spark plug firing end temperature must be kept low enough to prevent pre-ignition, but high enough to prevent fouling. This is called “thermal performance,” and is determined by the heat range selected. A hotter heat range spark plug has an insulator design with a longer heat flow path to the metal shell of the plug. As a result, more heat stays in the ceramic firing end and less is dissipated to the engine. A colder heat range spark plug has an insulator design with a shorter heat flow path to the metal shell of the plug. As a result, less heat stays in the ceramic firing end and more is dissipated to the engine. For a spark plug to function properly, it must have a tip temperature high enough to burn off carbon deposits (self-cleaning) and avoid fouling, while remaining low enough to avoid overheating the ceramic firing end and pre-ignition. Illustrations may differ slightly from original product and are not assembled, but in boxes for shipment. For the best performance from your STIHL tool, we recommend that you always use the STIHL NGK spark plug.

The primary function of the spark plug is to ignite the air-fuel mixture within the combustion chamber under any operating condition. The NGK Standard Spark Plug is constructed from durable material that is corrosion and abrasion resistant. The spark plug insulators are made of 99 percent pure alumina silicate, allowing for longer insulator noses for reduced fouling. This spark plug features a triple gasket sealing process that eliminates fuel leakage. It also includes a solid copper core that provides superior heat dissipation and conductivity. This spark plug has resistor that is produced with a glass and carbon mixture, which is fired to ensure superior performance and durability. It has corrugated ribs that prevent flashover and cold rolled threads to inhibit damage to the cylinder head. The union nut (1) of a STIHL spark plug is fixed in place. This ensures there is no spark gap which could impair performance or potentially ignite gasoline fumes.This spark plug has a resistor that is produced with a glass and carbon mixture, which is fired to ensure superior performance and durability. It has corrugated ribs that prevent flashover and cold rolled threads to inhibit damage to the cylinder head. Features & Benefits: Carbon fouling occurs when the spark plug firing end does not reach the self-cleaning temperature of approximately 450°C (842°F). Carbon deposits will begin to burn off from the insulator nose when the self-cleaning temperature is reached. When the heat range is too cold for the engine speed, the firing end temperature will stay below 450°C and carbon deposits will accumulate on the insulator nose. This is called carbon fouling. When enough carbon accumulates, the spark will travel the path of least resistance over the insulator nose to the metal shell instead of jumping across the gap. This usually results in a misfire and further fouling. SKU: PLCMR6HX Category: Spark Plugs Tags: 0000-400-7009, 0000-400-7011, 100, 101, 110, 130, 131, 168652-4, 31916-Z0H-003, 3365, 345FR, 439, 526XP, 531008615, 545, 545FX, 545FXT, 545RX, 545RXT, 550XP, 550XPG, 555, 556, 560XP, 560XPG, 562XP, 562XPG, 574519601, 6778, 90119, A425000040, BG56, BG66, BG86, Bosh, BR200, BR500, BR550, BR600, BR700, BT131, Champion, CMR6H, CMR6H-SLDCAP, CS2252, CS2253, CS2258, CS2260, CS2260WH, FC100, FC110, FC56, FC70, FC90, FC95, FR130, FR410, FR460, FR480, FS, FS100, FS110, FS111, FS130, FS131, FS240, FS25, FS260, FS310, FS311, FS360, FS40, fs410, FS460, FS460 C-EM, FS50, FS56, FS65, FS70, FS87, FS89, FS90, FS91, FS94, GX25, HL100, HL90, HL91, HL94, HL95, Honda, HQT-3, HS46, HS46 C-E, HS56, HS56 C-E, HS81, HS82, HS86, HS87, HT100, HT101, HT102, HT103, HT130, HT131, HT132, HT133, HT56, Husqvarna, Jonsered, KM100, KM110, KM111, KM130, KM131, KM56, KM90, KM94, Makita, MS 201 T, MS 201 TC, MS150, MS150 C-E, MS170, MS171, MS180, MS181, MS181 C, MS192 C-E, MS193C, MS193T, MS201, MS211, MS211 C, MS231, MS241, MS241 C-M, MS251, MS362, NGK, Plug, RZ7C, SH200, SH56, SH86, Shindaiwa, Spark, SR200, Stihl, T2600, T435, T540XP, USR4AC Related products Pre-ignition occurs when the air-fuel mixture is ignited by a hot object/area in the combustion chamber before the timed spark event occurs.

The NGK Standard Spark Plug is constructed from durable material that is corrosion and abrasion-resistant. The spark plug insulators are made of 99 per cent pure alumina silicate, providing longer insulator noses for reduced fouling. Husqvarna: 345FR, 439, 526XP, 545, 545FX, 545FXT, 545RX, 545RXT, 550XP, 550XPG, 555, 556, 560XP, 560XPG, 562XP, 562XPG, T435, T540XP, T540XP 11

NGK 12 Spark Plug CMR6H x1

Image are for illustration purposes only and may not reflect dealer inventory or unit specifications. Interference suppression resistance (2) is tuned to STIHL machines for the optimal spark and efficiency. This protects the machine’s ignition module from early failure. Air (atmospheric) pressure and cylinder pressure decrease as altitude increases. As a result, spark plug tip temperature will also decrease.

Some types of fuel additives in lower quality fuels can cause spark plug deposits that can lead to misfires, pre-ignition, etc. Fouling can occur more easily if the air-fuel mixture is not adjusted to compensate for the altitude. Higher altitude = less air = less fuel.https://www.ngkntk.com/newsroom/feature/emea/2020-1/counterfeit-spark-plugs-the-ignition-villains-that-could-ruin-your-engine/