{"product_id":"spark-plug-stihl-zk-c-10-fs-361-0-c-em-fs-38","title":"Spark Plug STIHL ZK C 10 FS 361.0 C-EM, FS 38","description":"\u003ch1\u003eSTIHL ZK C 10 Spark Plug - Genuine OEM Replacement for STIHL 2-Stroke Engines - 0000 400 7025\u003c\/h1\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eSTIHL ZK C 10 Spark Plug\u003c\/strong\u003e (OEM part number \u003cstrong\u003e0000 400 7025\u003c\/strong\u003e) is a genuine replacement ignition component for a wide range of STIHL 2-stroke petrol-powered handheld tools used across UK arboriculture, forestry, landscaping and grounds maintenance. With an \u003cstrong\u003eM10 x 1.0mm thread\u003c\/strong\u003e, nickel alloy electrodes and a corrosion-resistant plated steel shell, the ZK C 10 is engineered to STIHL's heat range and reach specification for the listed engine types, delivering consistent spark generation for reliable cold and hot starting, stable idling and clean acceleration across the rev range. Sold individually as a direct replacement for a worn, fouled or damaged original plug. Available from Gustharts, an authorised STIHL dealer with UK stock ready to ship.\u003c\/p\u003e\n\n\u003cp\u003eThe ZK C 10 is compatible with STIHL 2-MIX and M-Tronic engines, and covers a broad platform range including brushcutters, clearing saws, chainsaws, blowers, hedge trimmers and KombiMotor powerheads. \u003cstrong\u003eAlways set the electrode gap to your machine's service specification before installing\u003c\/strong\u003e — refer to the Technical Data section of your operator's manual for the correct gap for your specific model. The equivalent Bosch alternative is the \u003cstrong\u003eBosch USR4AC\u003c\/strong\u003e. Also available in a pack of 40 under part number 0000 400 7026.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGenuine STIHL ZK C 10 spark plug\u003c\/strong\u003e — manufactured to STIHL OEM specification for heat range, reach and electrical performance matched to listed engines\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eM10 x 1.0mm thread\u003c\/strong\u003e — smaller diameter than standard 14mm STIHL plugs; ensure you are ordering the correct specification for your model before purchasing\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOEM part number 0000 400 7025\u003c\/strong\u003e — also formatted as 00004007025; pack of 40 available separately under 0000 400 7026\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSold individually (each)\u003c\/strong\u003e — single plug per order\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFixed union nut\u003c\/strong\u003e — prevents an unintended spark gap that could impair ignition performance or create a fuel vapour ignition risk\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInterference suppression resistance\u003c\/strong\u003e — tuned to STIHL ignition systems for optimal spark timing and protection of the ignition module against premature failure\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoated sealing ring\u003c\/strong\u003e — improves contact and corrosion resistance in wet and demanding outdoor working conditions\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNickel alloy electrodes\u003c\/strong\u003e — durable construction suited to regular service intervals in professional and domestic use\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh-alumina ceramic insulator\u003c\/strong\u003e — provides electrical strength and thermal stability across the operating temperature range\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible with STIHL 2-MIX and M-Tronic engines\u003c\/strong\u003e — suitable for electronically managed and mechanically carburetted engine variants\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSet gap to machine specification before fitting\u003c\/strong\u003e — refer to your model's operator manual for the correct electrode gap\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTechnical Specification\u003c\/h2\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n  \u003ctable style=\"width:100%; border-collapse:collapse; text-align:left; border:1px solid #ddd;\"\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003cth style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003eBrand\u003c\/th\u003e\n        \u003ctd style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003eSTIHL\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003cth style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003eProduct Type\u003c\/th\u003e\n        \u003ctd style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003eSpark Plug\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003cth style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003ePlug Designation\u003c\/th\u003e\n        \u003ctd style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003eZK C 10\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003cth style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003eOEM Part Number\u003c\/th\u003e\n        \u003ctd style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003e0000 400 7025 (also: 00004007025)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003cth style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003ePack of 40 Part Number\u003c\/th\u003e\n        \u003ctd style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003e0000 400 7026\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003cth style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003eThread Size\u003c\/th\u003e\n        \u003ctd style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003eM10 x 1.0mm\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003cth style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003eShell Construction\u003c\/th\u003e\n        \u003ctd style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003ePlated steel\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003cth style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003eInsulator\u003c\/th\u003e\n        \u003ctd style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003eHigh-alumina ceramic\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003cth style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003eElectrodes\u003c\/th\u003e\n        \u003ctd style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003eNickel alloy\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003cth style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003eSealing\u003c\/th\u003e\n        \u003ctd style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003eCoated sealing washer for gas-tight seat\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003cth style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003eEquivalent (Bosch)\u003c\/th\u003e\n        \u003ctd style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003eBosch USR4AC\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003cth style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003eElectrode Gap\u003c\/th\u003e\n        \u003ctd style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003eSet to machine's service specification — refer to operator's manual\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003cth style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003ePack Size\u003c\/th\u003e\n        \u003ctd style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003e1 (each)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003cth style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003eEngine Compatibility\u003c\/th\u003e\n        \u003ctd style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003eSTIHL 2-stroke petrol; compatible with 2-MIX and M-Tronic engine variants\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003cth style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003ePart Type\u003c\/th\u003e\n        \u003ctd style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003eGenuine OEM Replacement Part\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eImportant Use Guidance\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eConfirm your model requires the ZK C 10 (M10 thread) before ordering.\u003c\/strong\u003e This plug uses a 10mm thread diameter. Many STIHL tools use 14mm thread spark plugs (such as the NGK BPMR7A or CMR6H). These are not interchangeable — fitting the wrong thread size will cause engine damage. Always check the Technical Data section of your operator's manual or the Fits Models list below before purchasing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSet the electrode gap before fitting.\u003c\/strong\u003e Always verify and adjust the electrode gap to your machine's stated service specification using a feeler gauge before installation. The correct gap varies by model and is specified in your operator's manual.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eReplace at the correct service interval.\u003c\/strong\u003e STIHL recommends inspecting the spark plug regularly and replacing it at the service interval stated in your machine's manual — typically every 100 operating hours or annually for most professional equipment, whichever comes first.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Choose Genuine STIHL Spark Plugs Over Aftermarket Alternatives?\u003c\/h2\u003e\n\u003cp\u003eSTIHL spark plugs are engineered with specific features that aftermarket alternatives do not reliably replicate. The fixed union nut prevents accidental spark gaps that can impair ignition or — in worst-case scenarios — ignite fuel vapour outside the combustion chamber. The interference suppression resistance is tuned specifically to STIHL's ignition module characteristics, reducing the risk of premature ignition module failure that can occur when a plug with incorrect suppression resistance is fitted. The sealing ring coating supports a gas-tight seat and resists corrosion in the wet, contaminated conditions typical of outdoor professional use.\u003c\/p\u003e\n\u003cp\u003eFor a low-cost consumable where the failure consequences include hard starting, misfiring, ignition module damage and unplanned downtime on a professional tool, the difference in cost between genuine and aftermarket is rarely worth the risk. For workshops and fleet operators managing multiple STIHL tools, the pack of 40 (0000 400 7026) offers better per-plug value for routine scheduled servicing.\u003c\/p\u003e\n\n\u003ch2\u003eFits Models\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eSTIHL BG 56\u003c\/li\u003e\n  \u003cli\u003eSTIHL BG 56 C-E\u003c\/li\u003e\n  \u003cli\u003eSTIHL BG 66-D\u003c\/li\u003e\n  \u003cli\u003eSTIHL BG 86 C-E\u003c\/li\u003e\n  \u003cli\u003eSTIHL BR 500\u003c\/li\u003e\n  \u003cli\u003eSTIHL FR 460 TC-EM\u003c\/li\u003e\n  \u003cli\u003eSTIHL FS 38 2-MIX\u003c\/li\u003e\n  \u003cli\u003eSTIHL FS 50 (4144)\u003c\/li\u003e\n  \u003cli\u003eSTIHL FS 50 C-E\u003c\/li\u003e\n  \u003cli\u003eSTIHL FS 55 2-MIX\u003c\/li\u003e\n  \u003cli\u003eSTIHL FS 55 R 2-MIX\u003c\/li\u003e\n  \u003cli\u003eSTIHL FS 56 (4144)\u003c\/li\u003e\n  \u003cli\u003eSTIHL FS 56 C-E\u003c\/li\u003e\n  \u003cli\u003eSTIHL FS 56 RC-E\u003c\/li\u003e\n  \u003cli\u003eSTIHL FS 70 C-E\u003c\/li\u003e\n  \u003cli\u003eSTIHL FS 131 R\u003c\/li\u003e\n  \u003cli\u003eSTIHL FS 240\u003c\/li\u003e\n  \u003cli\u003eSTIHL FS 240 C-E\u003c\/li\u003e\n  \u003cli\u003eSTIHL FS 360 C-EM (4147)\u003c\/li\u003e\n  \u003cli\u003eSTIHL FS 361.0 C-EM\u003c\/li\u003e\n  \u003cli\u003eSTIHL FS 411.0 C-EM\u003c\/li\u003e\n  \u003cli\u003eSTIHL FS 460\u003c\/li\u003e\n  \u003cli\u003eSTIHL FS 461 C-EM\u003c\/li\u003e\n  \u003cli\u003eSTIHL FS 461.0 C-EM L\u003c\/li\u003e\n  \u003cli\u003eSTIHL HS 87 R\u003c\/li\u003e\n  \u003cli\u003eSTIHL HS 87 T\u003c\/li\u003e\n  \u003cli\u003eSTIHL KM 131 R\u003c\/li\u003e\n  \u003cli\u003eSTIHL MM 56\u003c\/li\u003e\n  \u003cli\u003eSTIHL MS 151 C-E\u003c\/li\u003e\n  \u003cli\u003eSTIHL MS 151 TC-E\u003c\/li\u003e\n  \u003cli\u003eSTIHL MS 162\u003c\/li\u003e\n  \u003cli\u003eSTIHL MS 172\u003c\/li\u003e\n  \u003cli\u003eSTIHL MS 201 TC-M\u003c\/li\u003e\n  \u003cli\u003eSTIHL MS 212 C-BE\u003c\/li\u003e\n  \u003cli\u003eSTIHL MS 231 C-BE\u003c\/li\u003e\n  \u003cli\u003eSTIHL MS 241 C-M VW\u003c\/li\u003e\n  \u003cli\u003eSTIHL MS 362 C-M\u003c\/li\u003e\n  \u003cli\u003eSTIHL MS 400 C-M\u003c\/li\u003e\n  \u003cli\u003eSTIHL MS 400.1 C-M VW Arctic\u003c\/li\u003e\n  \u003cli\u003eSTIHL MS 500i-W\u003c\/li\u003e\n  \u003cli\u003eSTIHL SH 86\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAlso Known As\u003c\/h2\u003e\n\u003cp\u003eThe STIHL ZK C 10 is also referred to as a \u003cstrong\u003esmall engine spark plug\u003c\/strong\u003e, petrol engine spark plug, ignition plug and, colloquially, a \u003cstrong\u003eSTIHL plug 0000 400 7025\u003c\/strong\u003e. The designation \"ZK C 10\" identifies this as a STIHL 10mm thread plug — distinct from the larger 14mm thread plugs (such as BPMR7A and CMR6H) used in other STIHL tools. The Bosch equivalent designation is \u003cstrong\u003eUSR4AC\u003c\/strong\u003e. For correct ordering always use OEM part number \u003cstrong\u003e0000 400 7025\u003c\/strong\u003e for the single plug or \u003cstrong\u003e0000 400 7026\u003c\/strong\u003e for the pack of 40.\u003c\/p\u003e\n\n\u003ch2\u003eOften Replaced Alongside\u003c\/h2\u003e\n\u003cp\u003eSpark plugs are typically replaced as part of routine scheduled servicing. Common items to inspect and replace at the same service interval:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003ca href=\"\/ja\/collections\/stihl-spare-parts\"\u003eAir filter for compatible model\u003c\/a\u003e — inspect and replace at standard service intervals alongside the plug\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"\/ja\/collections\/stihl-spare-parts\"\u003eFuel pick-up filter\u003c\/a\u003e — replace at scheduled service intervals on most STIHL 2-stroke tools\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"\/ja\/collections\/sharpening-maintenance-tools\"\u003eSharpening and maintenance tools\u003c\/a\u003e — keep cutting equipment serviced alongside engine components\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eExplore More\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/ja\/collections\/stihl-spare-parts\"\u003eSTIHL Spare Parts\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/ja\/pages\/stihl-parts\"\u003eSTIHL Parts Finder\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/ja\/pages\/stihl-machinery\"\u003eSTIHL Machinery\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFAQs\u003c\/h2\u003e\n\n\u003ch3\u003eWhat is the difference between ZK C 10 and other STIHL spark plugs?\u003c\/h3\u003e\n\u003cp\u003eThe ZK C 10 uses an M10 x 1.0mm thread — smaller than the 14mm thread used in NGK BPMR7A and CMR6H plugs. These are not interchangeable. Always confirm your model requires the ZK C 10 before ordering by checking your operator's manual or the Fits Models list.\u003c\/p\u003e\n\n\u003ch3\u003eWhat is the part number for the STIHL ZK C 10 spark plug?\u003c\/h3\u003e\n\u003cp\u003eThe OEM part number is 0000 400 7025, also formatted as 00004007025. A pack of 40 is available under part number 0000 400 7026.\u003c\/p\u003e\n\n\u003ch3\u003eWhat is the electrode gap for the STIHL ZK C 10?\u003c\/h3\u003e\n\u003cp\u003eThe electrode gap varies by model. Always refer to the Technical Data section of your machine's operator manual for the correct gap specification and set it with a feeler gauge before fitting.\u003c\/p\u003e\n\n\u003ch3\u003eIs there a Bosch equivalent for the STIHL ZK C 10?\u003c\/h3\u003e\n\u003cp\u003eYes. STIHL UK confirms the Bosch USR4AC as the equivalent alternative. The STIHL ZK C 10 OEM plug is the recommended first choice for optimal performance and ignition module protection.\u003c\/p\u003e\n\n\u003ch3\u003eHow often should I replace the spark plug on a STIHL tool?\u003c\/h3\u003e\n\u003cp\u003eSTIHL recommends inspecting the plug regularly and replacing at the service interval in your manual — typically every 100 operating hours or annually, whichever comes first. Replace immediately if you see fouling, cracking, electrode erosion or oil contamination.\u003c\/p\u003e\n\n\u003ch3\u003eCan I use the ZK C 10 in a STIHL 4-stroke engine?\u003c\/h3\u003e\n\u003cp\u003eNo. The ZK C 10 is designed for STIHL 2-stroke petrol engines. Do not fit it to 4-stroke engines such as those in STIHL petrol lawn mowers or tillers, which require a different plug specification.\u003c\/p\u003e\n\n\u003ch3\u003eIs this plug compatible with STIHL M-Tronic engines?\u003c\/h3\u003e\n\u003cp\u003eYes. The ZK C 10 is compatible with STIHL 2-MIX and M-Tronic engine variants as listed in the Fits Models section above.\u003c\/p\u003e","brand":"Stihl","offers":[{"title":"Default Title","offer_id":58049971650934,"sku":"ST-0000 400 7025","price":2.92,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0690\/6603\/1348\/files\/STIHL_genuine_spares_from_authorised_dealer.png?v=1775040092","url":"https:\/\/www.gustharts.com\/ja\/products\/spark-plug-stihl-zk-c-10-fs-361-0-c-em-fs-38","provider":"Gustharts","version":"1.0","type":"link"}