{"product_id":"ngk-cmr6h-spark-plugs-3365-pack-of-10-for-chainsaws-outdoor-power-tools-copper-core-10mm","title":"NGK CMR6H Spark Plugs 3365 — Pack of 10 for Chainsaws \u0026 Outdoor Power Tools, Copper Core 10mm","description":"\u003cstrong\u003eNGK CMR6H (3365) spark plugs are OE-standard copper-core plugs built to deliver reliable ignition and heat control for a broad range of chainsaws and handheld outdoor power tools.\u003c\/strong\u003e\n\n\u003cp\u003eThese NGK 3365 \/ CMR6H plugs are manufactured to original-equipment tolerances and engineered for everyday outdoor power equipment use. They pair a solid copper core with nickel electrodes and a 5-rib alumina silicate insulator to reduce flashover, improve heat transfer and simplify installation and removal. Each pack contains ten plugs—convenient for professional crews or seasonal maintenance of multiple machines.\u003c\/p\u003e\n\n\u003ch3\u003eWhich tools and models work with the NGK CMR6H (3365)?\u003c\/h3\u003e\n\u003cp\u003eThe CMR6H is compatible with many popular chainsaw and small-engine models from major brands. It fits a range of STIHL chainsaws and accessory equipment, certain Husqvarna and RedMax engines, plus common trimmers, blowers and hedge trimmers from other manufacturers. Always cross-check thread size, reach and heat range before purchase.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSTIHL chainsaws: MS150TC, MS171, MS181, MS181C, MS201, MS201C, MS201T, MS211, MS211C, MS251, MS251C\u003c\/li\u003e\n  \u003cli\u003eREDMAX: GZ4000; Husqvarna: 545, 555, 526XP\u003c\/li\u003e\n  \u003cli\u003eOutdoor equipment: Jonsered brushcutters\/trimmers, Poulan Pro hedge trimmers, Shindaiwa trimmers\/brushcutters, STIHL blowers and sprayers\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the key technical specs and design benefits of these plugs?\u003c\/h3\u003e\n\u003cp\u003eNGK built the CMR6H to combine dependable ignition with simple serviceability. The copper core improves conductivity and expands usable heat range, while nickel electrodes and a nickel-alloy center offer robust wear resistance. Cold-rolled threads and NGK’s triple-gasket sealing minimize cylinder head damage and gas leakage during operation.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eThread diameter: 10 mm; reach: 7 mm; hex\/wrench size: 5\/8 in\u003c\/li\u003e\n  \u003cli\u003eGap: 0.028 in; resistor value approximately 10K ohm; single ground electrode\u003c\/li\u003e\n  \u003cli\u003eMaterials: 98% pure copper core, nickel center and ground electrodes, alumina silicate insulator with 5-rib design\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do these plugs affect maintenance and performance on small engines?\u003c\/h3\u003e\n\u003cp\u003eUsing OE-standard NGK plugs reduces misfires and keeps ignition consistent across varying fuel and load conditions. The solid copper core helps dissipate heat efficiently, lowering the risk of fouling in typical outdoor-use environments. Cold-rolled threads and treated porcelain simplify swapping plugs during routine service.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eReliable starts and steady idle for handheld equipment\u003c\/li\u003e\n  \u003cli\u003eImproved heat dissipation to widen safe operating range\u003c\/li\u003e\n  \u003cli\u003eDurable construction that resists thread damage and gas leakage\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should I check before installing the NGK 3365\/CMR6H plugs?\u003c\/h3\u003e\n\u003cp\u003eConfirm the plug’s thread diameter, reach and heat range match your engine’s specifications and owner’s manual recommendations. Inspect the gap and adjust if necessary to your equipment’s required setting. Use proper torque with a 5\/8-inch wrench and ensure the triple-gasket seat is clean for a tight seal.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify model compatibility and thread\/reach (10 mm thread, 7 mm reach)\u003c\/li\u003e\n  \u003cli\u003eCheck and set the 0.028 in gap as required by the engine\u003c\/li\u003e\n  \u003cli\u003eHand-start threads then torque to manufacturer spec to avoid damage\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? NGK CMR6H (3365) spark plugs are aimed at professional landscapers, equipment rental shops and homeowners who maintain multiple chainsaws or handheld machines. If you need OE-quality ignition parts that are easy to install, offer dependable starts and match common small-engine models from STIHL, Husqvarna, RedMax and others, this ten-pack supplies spare plugs for routine service and seasonal tune-ups.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are these NGK CMR6H plugs compatible with STIHL MS251?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The NGK 3365\/CMR6H is listed as compatible with STIHL MS251 and similar models—confirm thread and reach before installing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do these plugs come gapped and ready to use?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: They are produced with a 0.028 in gap, but you should check and adjust to your engine's specification before installation.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"NGK","offers":[{"title":"Default Title","offer_id":55171422912855,"sku":"B0H1T7SL4T","price":63.55,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/ngk-cmr6h-front-packaging_3f68f851-25c1-44bd-9502-a39ecb507cee.jpg?v=1790444841","url":"https:\/\/britishgarage.co.uk\/products\/ngk-cmr6h-spark-plugs-3365-pack-of-10-for-chainsaws-outdoor-power-tools-copper-core-10mm","provider":"British Garage","version":"1.0","type":"link"}