{"product_id":"royal-enfield-chaincase-inner-back-half-inches-4speed-ks-111889","title":"Royal Enfield Chaincase Inner \/ Back Half (Inches, 4-Speed KS) – Pre-Mar 2002 | 111889","description":"\u003cp data-start=\"235\" data-end=\"681\"\u003eIf your old Royal Enfield’s primary chaincase is leaking, cracked, rubbing the chain, or has damaged mounting points, replacing the \u003cstrong data-start=\"367\" data-end=\"398\"\u003echaincase inner \/ back half\u003c\/strong\u003e is the correct long-term fix—not sealant or welding. \u003cstrong data-start=\"452\" data-end=\"471\"\u003ePart No. 111889\u003c\/strong\u003e is the \u003cstrong data-start=\"479\" data-end=\"512\"\u003echaincase inner (inches type)\u003c\/strong\u003e used on \u003cstrong data-start=\"521\" data-end=\"605\"\u003e4-speed Kick Start (KS) Royal Enfield motorcycles manufactured before March 2002\u003c\/strong\u003e (older “inches” hardware standard). \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"683\" data-end=\"1068\"\u003eThis is the \u003cstrong data-start=\"695\" data-end=\"714\"\u003einner\/back half\u003c\/strong\u003e (engine-side piece) that supports alignment of the primary chain run, keeps the chain protected from dust\/water, and helps prevent oil seepage when paired with the correct gasket and fasteners. Unlike many generic aftermarket castings, a correct-spec replacement helps maintain proper clearances—reducing chain noise, premature wear, and repeat leaks.\u003c\/p\u003e\n\u003cp data-start=\"1070\" data-end=\"1397\"\u003eBest practice: replace the gasket, inspect the primary chain\/sprockets, and verify whether your bike uses \u003cstrong data-start=\"1176\" data-end=\"1196\"\u003einches vs metric\u003c\/strong\u003e chaincase hardware before ordering. (If your bike is later-model 5-speed \/ AVL \/ Electra \/ Thunderbird \/ Lightning, fitment must be verified—see compatibility.) \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 data-start=\"1399\" data-end=\"1423\"\u003eKey Features \u003c\/h2\u003e\n\u003cul data-start=\"1424\" data-end=\"2240\"\u003e\n\u003cli data-start=\"1424\" data-end=\"1504\"\u003e\n\u003cp data-start=\"1426\" data-end=\"1504\"\u003eGenuine-spec \u003cstrong data-start=\"1439\" data-end=\"1470\"\u003eChaincase Inner \/ Back Half\u003c\/strong\u003e for Royal Enfield primary drive\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1505\" data-end=\"1621\"\u003e\n\u003cp data-start=\"1507\" data-end=\"1621\"\u003e\u003cstrong data-start=\"1507\" data-end=\"1530\"\u003ePart Number: 111889\u003c\/strong\u003e (commonly referenced as chaincase inner\/back half) \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1622\" data-end=\"1733\"\u003e\n\u003cp data-start=\"1624\" data-end=\"1733\"\u003eDesigned for \u003cstrong data-start=\"1637\" data-end=\"1664\"\u003e4-speed Kick Start (KS)\u003c\/strong\u003e models \u003cstrong data-start=\"1672\" data-end=\"1693\"\u003ebefore March 2002\u003c\/strong\u003e \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1734\" data-end=\"1854\"\u003e\n\u003cp data-start=\"1736\" data-end=\"1854\"\u003e“\u003cstrong data-start=\"1737\" data-end=\"1752\"\u003eInches type\u003c\/strong\u003e” chaincase variant (important for correct mounting\/fasteners) \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1855\" data-end=\"1970\"\u003e\n\u003cp data-start=\"1857\" data-end=\"1970\"\u003eHelps restore proper primary-chain protection and reduces oil seepage risk (when installed with correct gasket)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1971\" data-end=\"2097\"\u003e\n\u003cp data-start=\"1973\" data-end=\"2097\"\u003eDirect replacement concept—no machining typically required (as per multiple dealers) \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2098\" data-end=\"2152\"\u003e\n\u003cp data-start=\"2100\" data-end=\"2152\"\u003eIdeal for restorations \/ rebuilds of older Bullets\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2153\" data-end=\"2240\"\u003e\n\u003cp data-start=\"2155\" data-end=\"2240\"\u003eRecommended add-ons: chaincase gasket, correct fastener set, primary chain inspection\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-start=\"2242\" data-end=\"2303\"\u003eCompatibility Table \u003cspan style=\"color: rgb(245, 5, 5);\"\u003e(PLEASE CHECK PART NUMBER BEFORE PURCHASE)\u003c\/span\u003e\n\u003c\/h3\u003e\n\u003cdiv class=\"TyagGW_tableContainer\"\u003e\n\u003cdiv class=\"group TyagGW_tableWrapper flex w-fit flex-col-reverse\" tabindex=\"-1\"\u003e\n\u003ctable data-start=\"2305\" data-end=\"3257\" class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead data-start=\"2305\" data-end=\"2376\"\u003e\n\u003ctr data-start=\"2305\" data-end=\"2376\"\u003e\n\u003cth data-start=\"2305\" data-end=\"2329\" data-col-size=\"sm\"\u003eModel (Royal Enfield)\u003c\/th\u003e\n\u003cth data-start=\"2329\" data-end=\"2348\" data-col-size=\"sm\"\u003eEngine \/ Gearbox\u003c\/th\u003e\n\u003cth data-start=\"2348\" data-end=\"2359\" data-col-size=\"sm\"\u003eStandard\u003c\/th\u003e\n\u003cth data-start=\"2359\" data-end=\"2376\" data-col-size=\"lg\"\u003eYears \/ Notes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody data-start=\"2396\" data-end=\"3257\"\u003e\n\u003ctr data-start=\"2396\" data-end=\"2570\"\u003e\n\u003ctd data-start=\"2396\" data-end=\"2435\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"2398\" data-end=\"2434\"\u003eBullet 350 (Kick Start, 4-speed)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"2435\" data-end=\"2453\" data-col-size=\"sm\"\u003eCI \/ 4-Speed KS\u003c\/td\u003e\n\u003ctd data-start=\"2453\" data-end=\"2462\" data-col-size=\"sm\"\u003eInches\u003c\/td\u003e\n\u003ctd data-start=\"2462\" data-end=\"2570\" data-col-size=\"lg\"\u003e\n\u003cstrong data-start=\"2464\" data-end=\"2480\"\u003ePre-Mar 2002\u003c\/strong\u003e confirmed usage for 4-speed KS; listed by dealers \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2571\" data-end=\"2721\"\u003e\n\u003ctd data-start=\"2571\" data-end=\"2597\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"2573\" data-end=\"2596\"\u003eDeluxe (4-speed KS)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"2597\" data-end=\"2615\" data-col-size=\"sm\"\u003eCI \/ 4-Speed KS\u003c\/td\u003e\n\u003ctd data-start=\"2615\" data-end=\"2624\" data-col-size=\"sm\"\u003eInches\u003c\/td\u003e\n\u003ctd data-start=\"2624\" data-end=\"2721\" data-col-size=\"lg\"\u003eListed as fitment by dealers; pre-Mar 2002 rule applies \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2722\" data-end=\"2859\"\u003e\n\u003ctd data-start=\"2722\" data-end=\"2735\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"2724\" data-end=\"2734\"\u003eCampus\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"2735\" data-end=\"2753\" data-col-size=\"sm\"\u003eCI \/ 4-Speed KS\u003c\/td\u003e\n\u003ctd data-start=\"2753\" data-end=\"2762\" data-col-size=\"sm\"\u003eInches\u003c\/td\u003e\n\u003ctd data-start=\"2762\" data-end=\"2859\" data-col-size=\"lg\"\u003eListed as fitment by dealers; pre-Mar 2002 rule applies \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2860\" data-end=\"3057\"\u003e\n\u003ctd data-start=\"2860\" data-end=\"2884\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"2862\" data-end=\"2883\"\u003eStandard 350 (KS)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"2884\" data-end=\"2902\" data-col-size=\"sm\"\u003eCI \/ 4-Speed KS\u003c\/td\u003e\n\u003ctd data-start=\"2902\" data-end=\"2913\" data-col-size=\"sm\"\u003e❓ Verify\u003c\/td\u003e\n\u003ctd data-start=\"2913\" data-end=\"3057\" data-col-size=\"lg\"\u003eListed by dealer, but confirm your bike is \u003cstrong data-start=\"2958\" data-end=\"3001\"\u003e4-speed KS + inches type + pre-Mar 2002\u003c\/strong\u003e before ordering \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3058\" data-end=\"3257\"\u003e\n\u003ctd data-start=\"3058\" data-end=\"3082\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"3060\" data-end=\"3081\"\u003eStandard 500 (KS)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"3082\" data-end=\"3100\" data-col-size=\"sm\"\u003eCI \/ 4-Speed KS\u003c\/td\u003e\n\u003ctd data-start=\"3100\" data-end=\"3111\" data-col-size=\"sm\"\u003e❓ Verify\u003c\/td\u003e\n\u003ctd data-start=\"3111\" data-end=\"3257\" data-col-size=\"lg\"\u003eListed by dealer, but confirm your bike is \u003cstrong data-start=\"3156\" data-end=\"3199\"\u003e4-speed KS + inches type + pre-Mar 2002\u003c\/strong\u003e before ordering\u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3 data-start=\"3259\" data-end=\"3299\"\u003eExplicit caution \u003c\/h3\u003e\n\u003cp data-start=\"3300\" data-end=\"3529\"\u003eSome sellers explicitly warn this part is \u003cstrong data-start=\"3342\" data-end=\"3398\"\u003enot for Electra \/ Machismo \/ Lightning \/ Thunderbird\u003c\/strong\u003e families. Treat those as \u003cstrong data-start=\"3424\" data-end=\"3486\"\u003eNOT compatible unless you verify by chassis + parts manual\u003c\/strong\u003e. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 data-start=\"3531\" data-end=\"3544\"\u003eVariants\u003c\/h2\u003e\n\u003cul data-start=\"3545\" data-end=\"3701\"\u003e\n\u003cli data-start=\"3545\" data-end=\"3701\"\u003e\n\u003cp data-start=\"3547\" data-end=\"3701\"\u003e\u003cstrong data-start=\"3547\" data-end=\"3562\"\u003eNo variants\u003c\/strong\u003e (single part).\u003cbr data-start=\"3577\" data-end=\"3580\"\u003eIf you want, you can add a Shopify note\/selector for: \u003cstrong data-start=\"3634\" data-end=\"3679\"\u003e“Inches (Pre-Mar 2002) vs Metric\/5-Speed”\u003c\/strong\u003e to stop wrong orders.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"3703\" data-end=\"3738\"\u003eFAQs \u003c\/h2\u003e\n\u003col data-start=\"3739\" data-end=\"4829\"\u003e\n\u003cli data-start=\"3739\" data-end=\"3908\"\u003e\n\u003cp data-start=\"3742\" data-end=\"3908\"\u003e\u003cstrong data-start=\"3742\" data-end=\"3785\"\u003eIs 111889 the inner or outer chaincase?\u003c\/strong\u003e\u003cbr data-start=\"3785\" data-end=\"3788\"\u003eIt is commonly sold as the \u003cstrong data-start=\"3815\" data-end=\"3846\"\u003echaincase inner \/ back half\u003c\/strong\u003e (engine-side half). \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3910\" data-end=\"4203\"\u003e\n\u003cp data-start=\"3913\" data-end=\"4203\"\u003e\u003cstrong data-start=\"3913\" data-end=\"3984\"\u003eWill this fit my 5-speed \/ AVL \/ Electra \/ Thunderbird \/ Lightning?\u003c\/strong\u003e\u003cbr data-start=\"3984\" data-end=\"3987\"\u003eDo \u003cstrong data-start=\"3990\" data-end=\"3997\"\u003enot\u003c\/strong\u003e assume. Several sellers state it’s for \u003cstrong data-start=\"4037\" data-end=\"4064\"\u003e4-speed KS pre-Mar 2002\u003c\/strong\u003e and caution against Electra\/Thunderbird\/Lightning families. Verify by your parts manual\/chassis. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4205\" data-end=\"4441\"\u003e\n\u003cp data-start=\"4208\" data-end=\"4441\"\u003e\u003cstrong data-start=\"4208\" data-end=\"4241\"\u003eWhat does “Inches type” mean?\u003c\/strong\u003e\u003cbr data-start=\"4241\" data-end=\"4244\"\u003eOlder Bullets used “inches” hardware standards; the official retired catalogue lists 111889 as \u003cstrong data-start=\"4339\" data-end=\"4368\"\u003echain case inner (inches)\u003c\/strong\u003e and notes \u003cstrong data-start=\"4379\" data-end=\"4398\"\u003ebefore Mar 2002\u003c\/strong\u003e. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4443\" data-end=\"4609\"\u003e\n\u003cp data-start=\"4446\" data-end=\"4609\"\u003e\u003cstrong data-start=\"4446\" data-end=\"4488\"\u003eWhat should I replace along with this?\u003c\/strong\u003e\u003cbr data-start=\"4488\" data-end=\"4491\"\u003eAt minimum: chaincase gasket; recommended: inspect primary chain \u0026amp; sprockets, check alignment, replace worn fasteners.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4611\" data-end=\"4829\"\u003e\n\u003cp data-start=\"4614\" data-end=\"4829\"\u003e\u003cstrong data-start=\"4614\" data-end=\"4640\"\u003eIs machining required?\u003c\/strong\u003e\u003cbr data-start=\"4640\" data-end=\"4643\"\u003eDealers describe it as a direct replacement with \u003cstrong data-start=\"4692\" data-end=\"4727\"\u003eno machining typically required\u003c\/strong\u003e (provided your model matches the KS 4-speed pre-2002 spec).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"UNDER THE HOOD","offers":[{"title":"Default Title","offer_id":50867182829863,"sku":null,"price":2268.0,"currency_code":"INR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0878\/7447\/0183\/files\/ChatGPT_Image_Dec_2_2025_10_22_57_PM.png?v=1776599055","url":"https:\/\/underthehood.co.in\/products\/royal-enfield-chaincase-inner-back-half-inches-4speed-ks-111889","provider":"UNDER THE HOOD","version":"1.0","type":"link"}