{"product_id":"universal-parts-qmb139-cylinder-head-emissions-151-76","title":"Universal Parts QMB139 Cylinder Head - Emissions","description":"Universal Parts PAIR Style (Emissions) Cylinder Head for 50cc 4-stroke QMB139 engines.\u003cbr\u003e \u003cp\u003e\u003cb\u003ePAIR is an acronym for Pulsed Secondary Air Injection System. It is an emissions control system used to lower HC and CO emissions. It works by allowing air into the exhaust flow.\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e \n\n\u003cli\u003e39mm Bore\u003c\/li\u003e\n\u003cli\u003eIntake Port Diameter: 17mm  \n\n\u003c\/li\u003e\n\u003cli\u003eExhaust Port Diameter: 18mm \n\n\u003c\/li\u003e\n\u003cli\u003eEmission Control System: Pulsed Secondary Air Injection System(PAIR)\u003c\/li\u003e\n\u003c\/ul\u003e \n\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003eQMB139 50cc\/49cc , Various unlisted makes\/models","brand":"Universal Parts","offers":[{"title":"Default Title","offer_id":49986062418200,"sku":"151-76","price":46.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/1728\/1816\/files\/450233.jpg?v=1744828804","url":"https:\/\/www.scooterworks.com\/products\/universal-parts-qmb139-cylinder-head-emissions-151-76","provider":"Scooterworks USA, LLC","version":"1.0","type":"link"}