Copper is the most common, followed by silver and platinum. Due to the high prices for the precious metals, the spark plugs are also correspondingly more expensive than their copper counterparts. Komatsu Zenoah G2500TS, Komatsu Zenoah G3300/E/EZ, Komatsu Zenoah G3700/800, Komatsu Zenoah G4200/500, Komatsu Zenoah G5000/300, Komatsu Zenoah G6200

The usual threads are M10, M12 and M14 Classical vehicles usually have an M14 thread. 4-stroke and modern 2-stroke with injection use the smaller plugs with M10 or M12. Shibaura B24, Shibaura B24DU, Shibaura B30, Shibaura B31, Shibaura B31DU, Shibaura B35, Shibaura B35DU Stihl BR340/L, Stihl BR350, Stihl BR380, Stihl BR400, Stihl BR430, Stihl SR340, Stihl SR400, Stihl SR430, Stihl SR450 Spark plugs are a key part of maintaining a petrol power tool, especially STIHL chainsaws, and you may think that one spark plug is much the same as another. A standard NGK spark plug and NGK spark plugs sold by STIHL may have the same part number stamped on them, but the STIHL NGK spark plug has some key differences. The heat value is decisive for the thermal fatigue strength of the spark plug and its self-cleaning effect. A distinction is therefore made between so-called cold and hot spark plugs.For the best performance from your STIHL tool, we recommend that you always use the STIHL NGK spark plug. https://www.ngkntk.com/newsroom/feature/emea/2020-1/counterfeit-spark-plugs-the-ignition-villains-that-could-ruin-your-engine/ The temperature resistance is achieved by differently designed insulators. A cold candle can give off a lot of temperature via the cylinder head, but with a cold candle exactly this is strongly prevented. The heat value has nothing to do with the strength or performance of a spark plug. A cold spark plug in a cold (weak) engine will oil or soot and can therefore break without damaging the engine itself. A hot spark plug in a racing engine burns up and damages the engine ,usually severely. Stihl BG75, Stihl BR106, Stihl BR320/L, Stihl BR380, Stihl BR400, Stihl BR420, Stihl SR320, Stihl SR400, Stihl SR420

High quality NGK spark plug which is designed using the latest technology to give optimum performance over the Lawnmowers entire rev. range 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. Husqvarna 165RX, Husqvarna 240F/L/R/RBD/RJ, Husqvarna 241R, Husqvarna 244GX, Husqvarna 245R/RX, Husqvarna 250R/RX, Husqvarna 252RX, Husqvarna 265RXStihl FS48, Stihl FS52, Stihl FS62, Stihl FS66, Stihl FS75, Stihl FS80, Stihl FS81, Stihl FS85, Stihl FS86 Komatsu Zenoah G415AVS, Komatsu Zenoah G455AVS, Komatsu Zenoah G500AVS, Komatsu Zenoah G561AVS, Komatsu Zenoah G621AVS 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. Jonsered GC2125, Jonsered GC2236, Jonsered GR2026, Jonsered GR2032/6, Jonsered GR2126, Jonsered GT2125

Jonsered CS2135/7/8/9, Jonsered CS2141/5/7, Jonsered CS2150/2/3/5/6/9, Jonsered CS2163/5, Jonsered CS2171, Jonsered CS2186, Jonsered CS2255 Husqvarna 36, Husqvarna 40, Husqvarna 41, Husqvarna 42, Husqvarna 45, Husqvarna 50, Husqvarna 51, Husqvarna 55, Husqvarna 61, Husqvarna 66The material is ultimately almost only interesting for wear, only the extremely thin iridium electrodes (Ø=0.6mm) have a higher ignition voltage, the spread of the flame front in the combustion chamber improves.