{"product_id":"cvk-main-jet-135-for-scooters-mopeds","title":"Cvk Main Jet (# 135) for Scooters \u0026 Mopeds","description":"\u003ch2\u003eCvk Main Jet (#135) for 139QMB and GY6 Scooters\u003c\/h2\u003e\u003cp\u003eThe Cvk Main Jet (#135) is specifically designed for 139QMB and GY6 scooters, fitting a wide array of CVK carburetors that accommodate a 5mm main jet. This part is important for optimizing fuel delivery, improving engine performance and overall functionality. It is one of the key components among \u003ca href=\"\/collections\/scooter-carburetors\"\u003escooter carburetors \u0026amp; jets\u003c\/a\u003e, making it significant for achieving the best riding experience. Proper jetting may require some adjustments, so consult available guides for detailed instructions on how to achieve the right setup.\u003c\/p\u003e\u003ch3\u003eConstruction and Compatibility\u003c\/h3\u003e\u003cp\u003eThis main jet features a Keihin round-style design with a precise M5x0.80 thread size. Its overall length measures 8mm, ensuring a secure fit in compatible carburetors. The jet is suitable for various engine codes, making it versatile for several models in the scooter market.\u003c\/p\u003e\u003ch3\u003eWhen to Replace\u003c\/h3\u003e\u003cp\u003eConsider replacing this main jet if you experience performance issues, such as lackluster acceleration or erratic engine behavior. If modifications have been made to your scooter or moped, adjusting the jetting may also be necessary to maintain peak performance levels.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Main Jet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size:\u003c\/strong\u003e M5x0.80\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length:\u003c\/strong\u003e 8mm\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eThis main jet is compatible with 139QMB-based 50cc \/ 80cc engines and 157QMJ-based 125cc \/ 150cc \/ 169cc engines. It fits various models with engine codes that contain \"QM\" or \"FM\" and use a carburetor designed for a 5mm main jet.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e139QMB: 139QMA; 1P39QMB; 1P39QMA-2\u003c\/li\u003e\n\u003cli\u003eYN139QMB: JJ1P39QMB; 139FMA-2; BD1P39QMB\u003c\/li\u003e\n\u003cli\u003e157QMJ: 161QMK; 152QMI; 1P61QMK\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eNot sure it fits? Contact us with your scooter's make, model and year and we'll confirm the fit before you order.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eShop more:\u003c\/strong\u003e \u003ca href=\"\/collections\/scooter-carburetors\"\u003eScooter Carburetors \u0026amp; Jets\u003c\/a\u003e · \u003ca href=\"\/collections\/scooter-parts\"\u003eScooter Parts\u003c\/a\u003e\u003c\/p\u003e","brand":"Magic Cars","offers":[{"title":"Default Title","offer_id":52800353009895,"sku":"25-914492","price":3.6,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2245\/9711\/files\/cvk-main-jet-135-1.jpg?v=1791665690","url":"https:\/\/www.magiccars.com\/products\/cvk-main-jet-135-for-scooters-mopeds","provider":"MagicCars","version":"1.0","type":"link"}