{"product_id":"trimmer-gear-head-replacement-for-stihl-fs-series-direct-fit-gearbox","title":"Trimmer Gear Head Replacement for Stihl FS Series - Direct Fit Gearbox","description":"\u003cp\u003eIn this review the reviewer examines the Yutacorex replacement gear head designed for a wide range of Stihl FS and FR series brushcutters, including FS91, FS111R, FS131 and many more. The bottom line: this gearbox replacement is for homeowners and maintenance pros who need a direct-fit, lightweight replacement that includes all small parts to restore a worn or damaged gear head assembly. The review finds the unit well suited for routine repairs where matching the listed model numbers is confirmed before purchase.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete replacement kit:\u003c\/strong\u003e Includes the gear head, thrust plate, thrust washer, rider plate, collar nut and five stainless screws so you have the components needed for reassembly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect compatibility:\u003c\/strong\u003e Replaces part number 4180 640 0114 and associated thrust and rider components, which makes it easy to match to many Stihl FS and FR models.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLightweight construction:\u003c\/strong\u003e The gear head is described as lighter weight, which can reduce front-end load on a handheld trimmer during extended use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSturdy fasteners:\u003c\/strong\u003e Supplied stainless steel screws resist corrosion and provide stable clamping for outdoor use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexible blade exchange:\u003c\/strong\u003e The design allows straightforward swapping of weed eater blades or heads, simplifying field repairs.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThis replacement gear head is intended for people who already own compatible Stihl trimmers and need a straightforward gearbox swap to restore function. It suits homeowners, landscapers and repair technicians who can confirm model compatibility and who are comfortable performing a mechanical replacement using supplied parts.\u003c\/p\u003e\u003cp\u003ePeople who should look elsewhere include owners of trimmers with nonmatching stamped part numbers or unique backpack models with a different bottom decorative fit, and users expecting a factory-original branded part without aftermarket differences.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eComplete kit contains all small parts, reducing the need to source extras.\u003c\/li\u003e\n\u003cli\u003eMatches a wide range of Stihl FS and FR series numbers, making it versatile for repairs.\u003c\/li\u003e\n\u003cli\u003eStainless screws and lightweight gear head balance durability and reduced weight.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003eMust confirm model match before ordering because some backpack or specialty bottoms differ.\u003c\/li\u003e\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eYutacorex\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReplacement part number\u003c\/td\u003e\n\u003ctd\u003e4180 640 0114\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded items\u003c\/td\u003e\n\u003ctd\u003eGear head, thrust plate, thrust washer, rider plate, collar nut M10x1 left hand, 5 stainless screws\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible models\u003c\/td\u003e\n\u003ctd\u003eSelected Stihl FS and FR series (see product list for exact models)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCollar nut thread\u003c\/td\u003e\n\u003ctd\u003eM10x1 left hand\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eScrew material\u003c\/td\u003e\n\u003ctd\u003eStainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThis replacement gear head is a practical value for anyone who confirms fit with the listed Stihl model numbers and wants a ready-to-install kit. It delivers necessary hardware, corrosion-resistant screws and a lighter assembly that makes installation and blade exchange easier, though buyers should verify the bottom decorative and backpack differences before purchasing.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWill this fit my Stihl FS240?\u003c\/strong\u003e\u003cbr\u003eYes, FS240 and many FS\/FR models are listed as compatible, but you must confirm the stamped part number matches before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the kit include mounting screws?\u003c\/strong\u003e\u003cbr\u003eYes, five stainless steel screws are included along with the collar nut and internal plates needed for assembly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the collar nut standard thread?\u003c\/strong\u003e\u003cbr\u003eThe supplied collar nut is M10x1 left hand thread, matching the original specified part.\u003c\/p\u003e","brand":"Yutacorex","offers":[{"title":"Default Title","offer_id":48206043709659,"sku":"B0CH89JRPC","price":33.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/71ovYgfAQrL._AC_SL1500.jpg?v=1770265763","url":"https:\/\/gearmusthave.com\/products\/trimmer-gear-head-replacement-for-stihl-fs-series-direct-fit-gearbox","provider":"GearMustHave","version":"1.0","type":"link"}