{"product_id":"filter-base","title":"Filter Base MS640, MS660, 066","description":"\u003ch1\u003eSTIHL Filter Base for 066, MS 640 \u0026amp; MS 660 Chainsaws - 1122 120 3402\u003c\/h1\u003e\n\n\u003cp\u003eThe STIHL Filter Base for 066, MS 640 and MS 660 chainsaws is a genuine OEM replacement component designed to mount and seal the air filter assembly on the intake side of compatible professional STIHL petrol chainsaws. Manufactured from durable moulded polymer, this air filter base helps maintain correct filter seating, stable airflow and effective engine protection during demanding cutting work.\u003c\/p\u003e\n\n\u003cp\u003eBuilt to STIHL original equipment standards, this replacement filter base helps keep dust, debris and contamination away from the carburettor and cylinder. It is ideal for professional forestry workers, arborists, landscapers, site teams and experienced domestic users replacing a cracked, warped, worn or damaged air filter base to restore reliable starting, smooth idling and consistent cutting performance.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eGenuine STIHL OEM filter base for assured compatibility and fit\u003c\/li\u003e\n  \u003cli\u003eManufacturer Part Number: 1122 120 3402\u003c\/li\u003e\n  \u003cli\u003eDesigned for selected STIHL professional petrol chainsaws\u003c\/li\u003e\n  \u003cli\u003eMounts and seals the air filter assembly on the intake side of the engine\u003c\/li\u003e\n  \u003cli\u003eDurable moulded polymer construction for long service life\u003c\/li\u003e\n  \u003cli\u003eHelps maintain clean airflow and effective filtration\u003c\/li\u003e\n  \u003cli\u003eProtects the carburettor and cylinder from dust and debris ingress\u003c\/li\u003e\n  \u003cli\u003eResistant to vibration, fuel mist, oil and heat during chainsaw use\u003c\/li\u003e\n  \u003cli\u003eDirect-fit replacement using the original air filter and fasteners\u003c\/li\u003e\n  \u003cli\u003eSupports consistent starting, idling, throttle response and cutting efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\n\u003cp\u003eThis STIHL filter base is used during routine servicing or repair of compatible professional chainsaws where the original air filter base is cracked, warped, worn or no longer sealing correctly. It is suitable for forestry, arboriculture, landscaping, construction site work, firewood processing and heavy-duty cutting applications where clean intake air and dependable engine performance are essential.\u003c\/p\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;\"\u003eFilter Base \/ Air Filter Housing Base\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003cth style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003eManufacturer Part Number\u003c\/th\u003e\n        \u003ctd style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003e1122 120 3402\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003cth style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003eAlternate Part Numbers\u003c\/th\u003e\n        \u003ctd style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003e1122-120-3402, 11221203402\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003cth style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003eMaterial\u003c\/th\u003e\n        \u003ctd style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003eMoulded polymer\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003cth style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003eFunction\u003c\/th\u003e\n        \u003ctd style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003eMounts and seals the air filter assembly while supporting clean intake airflow\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003cth style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003eSuitable For\u003c\/th\u003e\n        \u003ctd style=\"border:1px solid #ddd; padding:10px; text-align:left;\"\u003eSelected STIHL professional chainsaws including 066, MS 640, MS 650 and MS 660 models\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\u003eFits Models\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eSTIHL 066\u003c\/li\u003e\n  \u003cli\u003eSTIHL MS 640\u003c\/li\u003e\n  \u003cli\u003eSTIHL MS 650\u003c\/li\u003e\n  \u003cli\u003eSTIHL MS 660\u003c\/li\u003e\n  \u003cli\u003eSTIHL MS640\u003c\/li\u003e\n  \u003cli\u003eSTIHL MS650\u003c\/li\u003e\n  \u003cli\u003eSTIHL MS660\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAlso Known As\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eSTIHL air filter housing\u003c\/li\u003e\n  \u003cli\u003eSTIHL air filter support\u003c\/li\u003e\n  \u003cli\u003eSTIHL filter mount\u003c\/li\u003e\n  \u003cli\u003eSTIHL airbox base\u003c\/li\u003e\n  \u003cli\u003eSTIHL air cleaner base\u003c\/li\u003e\n  \u003cli\u003eSTIHL intake base plate\u003c\/li\u003e\n  \u003cli\u003eSTIHL carburettor intake housing\u003c\/li\u003e\n  \u003cli\u003eSTIHL MS 660 filter base\u003c\/li\u003e\n  \u003cli\u003eSTIHL MS 640 air filter base\u003c\/li\u003e\n  \u003cli\u003eSTIHL 066 filter housing base\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose Genuine STIHL Parts?\u003c\/h2\u003e\n\u003cp\u003eGenuine STIHL parts are manufactured to match the original specification for fit, sealing, durability and performance. Choosing an original STIHL filter base helps maintain correct air filter seating, carburettor protection and clean intake airflow, reducing the risk of poor fitment, air leaks, contamination or premature engine wear.\u003c\/p\u003e\n\n\u003ch2\u003eExplore More\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/collections\/stihl-spare-parts\"\u003eSTIHL Spare Parts\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/pages\/stihl-parts\"\u003eSTIHL Parts Finder\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/collections\/chainsaw-parts\"\u003eChainsaw Parts\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/collections\/stihl-chainsaw-guide-bar-and-chain-selector\"\u003eSTIHL Chainsaw Chain Selector\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/collections\/sharpening-maintenance-tools\"\u003eChain Sharpening Tools\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFAQs\u003c\/h2\u003e\n\n\u003ch3\u003eIs this a genuine STIHL filter base?\u003c\/h3\u003e\n\u003cp\u003eYes, this is a genuine STIHL OEM filter base manufactured to original equipment standards.\u003c\/p\u003e\n\n\u003ch3\u003eWhat is the part number for this STIHL filter base?\u003c\/h3\u003e\n\u003cp\u003eThe manufacturer part number is 1122 120 3402. It may also be listed as 1122-120-3402 or 11221203402.\u003c\/p\u003e\n\n\u003ch3\u003eWhich STIHL chainsaws does this filter base fit?\u003c\/h3\u003e\n\u003cp\u003eThis filter base fits selected STIHL professional chainsaws including 066, MS 640, MS 650 and MS 660 models.\u003c\/p\u003e\n\n\u003ch3\u003eWhat does the air filter base do?\u003c\/h3\u003e\n\u003cp\u003eThe air filter base mounts and seals the air filter assembly, helping keep dust and debris away from the carburettor and cylinder while maintaining stable intake airflow.\u003c\/p\u003e\n\n\u003ch3\u003eWhen should this filter base be replaced?\u003c\/h3\u003e\n\u003cp\u003eReplace the filter base if it is cracked, warped, worn, damaged or no longer allows the air filter to seat and seal correctly.\u003c\/p\u003e","brand":"Stihl","offers":[{"title":"Default Title","offer_id":57978084557174,"sku":"ST-1122 120 3402","price":10.92,"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\/products\/filter-base","provider":"Gustharts","version":"1.0","type":"link"}