{"product_id":"cvk-main-jet-140-for-scooters-mopeds","title":"Cvk Main Jet (# 140) for Scooters \u0026 Mopeds","description":"\u003ch2\u003eCVK Main Jet (#140) for 139QMB and GY6 Scooters and Mopeds\u003c\/h2\u003e\u003cp\u003eThis CVK Main Jet (#140) is made for 139QMB and GY6 scooters and mopeds. It helps regulate the fuel mixture so the engine runs efficiently. It works with a range of CVK carburetors that have a 5mm main jet opening. You can find more options in our \u003ca href=\"\/collections\/scooter-carburetors\"\u003escooter carburetors and jets\u003c\/a\u003e range.\u003c\/p\u003e\u003ch3\u003eJetting and Performance\u003c\/h3\u003e\u003cp\u003eGetting the jetting right usually takes some testing, since it has a direct effect on how the engine performs. This main jet supplies the correct fuel-air ratio for smooth engine operation. Depending on how you ride and the conditions you ride in, you may need to make small adjustments.\u003c\/p\u003e\u003ch3\u003eConstruction and Fit\u003c\/h3\u003e\u003cp\u003eThis main jet has a Keihin round-style body and an M5x0.80 thread. It measures 8mm overall, so it suits the many scooter models that use a 5mm main jet opening. Install it carefully and make sure it is seated securely in the carburetor for best results.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\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\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e 139QMB-based 50cc\/80cc GY6 engines and 157QMJ-based 125cc\/150cc\/169cc engines with a 5mm main jet slot CVK\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e139QMB-based 50cc\/80cc engines (codes 139QMA, 139QMB, 1P39QMB, 1P39QMA-2, YN139QMB, JJ1P39QMB, 139FMA-2, BD1P39QMB, BN139QMB, 147QMD, other QMA and QMB)\u003c\/li\u003e\n\u003cli\u003e157QMJ-based 125cc\/150cc\/169cc engines (codes 157QMJ, 161QMK, 152QMI, 1P61QMK, YN1P57QMJ, 1P52FMI, 154FMI, JJ157QMJ, 1P57QMJ, BN157QMJ, BN161QMK-A, other QMJ, QMK and QMI)\u003c\/li\u003e\n\u003cli\u003eOther GY6 engines with a 5mm main jet slot CVK carburetor and an engine code containing QM or FM\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eHow to choose:\u003c\/strong\u003e Confirm the carburetor's main jet slot is 5mm and the thread is M5x0.80. The jet is 8mm long and has a Keihin round-style head.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eShop more:\u003c\/strong\u003e \u003ca href=\"\/collections\/scooter-carburetors\"\u003eScooter Carburetors and Jets\u003c\/a\u003e · \u003ca href=\"\/collections\/scooter-parts\"\u003eScooter Parts\u003c\/a\u003e\u003c\/p\u003e","brand":"Trend Times Toy Stores","offers":[{"title":"Default Title","offer_id":51138638282809,"sku":"TT-26496","price":3.58,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0665\/3358\/9049\/files\/cvk-main-jet-140-1.jpg?v=1794376496","url":"https:\/\/www.trendtimes.com\/products\/cvk-main-jet-140-for-scooters-mopeds","provider":"Trend Times Toy Stores","version":"1.0","type":"link"}