{"product_id":"rocker-arm-assembly-type-1-64mm-qmb139-1100-1326","title":"Blue Line Valve Rocker Arm Assembly: 64mm 139QMB Type 1","description":"\u003cp\u003eKeep your 139QMB engine running smoothly with this \u003cstrong\u003eOEM two-valve rocker arm assembly\u003c\/strong\u003e from Blue Line Designed specifically for \u003cstrong\u003eType 1\u003c\/strong\u003e engines with 64mm valve stems and a shorter cylinder head, this is a direct-fit replacement that restores proper valve actuation and engine timing without modification.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eNot sure which type you have?\u003c\/strong\u003e Type 1 engines have 64mm valve stems and a shorter head. If your valve stems measure 69mm with a taller cylinder head, you have a Type 2 engine (made by Zhejiang ZhongNeng \/ ZNEN) — this assembly will not fit Type 2 engines.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Direct Fit:\u003c\/strong\u003e Exact replacement for Type 1 139QMB engines — no modification required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete Assembly:\u003c\/strong\u003e Includes rocker arm holder, inlet and outlet shafts, two rocker arms, two tappets, and two nuts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Tolerances:\u003c\/strong\u003e Machined to OEM specifications for reliable valve timing and long service life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBroad Engine Compatibility:\u003c\/strong\u003e Fits all QMA\/QMB engine codes with Type 1 head configuration.\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRocker Arm Holder:\u003c\/strong\u003e L: 66mm \/ W: 66mm \/ H: 26mm \/ Holes: 7.4\u0026lt;9mm \/ Spacing: 50mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShaft Inlet:\u003c\/strong\u003e L: 51.3mm \/ OD: 8.8\u0026lt;12.9mm \/ ID: M5\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShaft Outlet:\u003c\/strong\u003e L: 43.5mm \/ OD: 10mm \/ ID: M5\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRocker Arms (x2):\u003c\/strong\u003e L: 52.7mm \/ W: 22.2mm \/ H: 18.6mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTappets (x2):\u003c\/strong\u003e L: 18.53mm \/ OD: M5x0.5mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNuts (x2):\u003c\/strong\u003e L: 4.2mm \/ ID: M5x0.5mm \/ OD: 9mm\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eCSC Model Compatibility\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\u003cth style=\"text-align: left;\"\u003eModel\u003c\/th\u003e\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\u003ctd\u003eCSC Bella Classic 50\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eCSC Nitro Sport 50\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eCSC Pug 50\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eCSC go\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eCSC go MAX\u003c\/td\u003e\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003chr\u003e\u003ch3\u003e139QMB Engine Code Compatibility\u003c\/h3\u003e\u003cp\u003eFits 50cc and 80cc engines with the following engine codes (Type 1 head only):\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\u003cth style=\"text-align: left;\"\u003eEngine Codes\u003c\/th\u003e\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\u003ctd\u003e139QMA  |  139QMB  |  1P39QMB  |  1P39QMA-2\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eYN139QMB  |  JJ1P39QMB  |  139FMA-2  |  BD1P39QMB\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eBN139QMB  |  147QMD  |  Other QMA models  |  Other QMB models\u003c\/td\u003e\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eDon't see your engine code? If it includes \"QM\" or \"FM\" and you're running a 139QMB Type 1 engine, this part is compatible.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003ca rel=\"noopener noreferrer\" href=\"https:\/\/www.p65warnings.ca.gov\" target=\"_blank\"\u003eCalifornia Prop 65 Warning: www.p65warnings.ca.gov\u003c\/a\u003e\u003c\/p\u003e","brand":"Chicago Scooter Company","offers":[{"title":"Default Title","offer_id":46756580720920,"sku":"1100-1326","price":24.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/1728\/1816\/products\/1100-1326_8aec44e2-3437-42a5-96ab-d75ee5d76d6d.jpg?v=1695269572","url":"https:\/\/www.scooterworks.com\/products\/rocker-arm-assembly-type-1-64mm-qmb139-1100-1326","provider":"Scooterworks USA, LLC","version":"1.0","type":"link"}