{"product_id":"cvk-main-jet-148-for-scooters-mopeds","title":"Cvk Main Jet (# 148) for Scooters \u0026 Mopeds","description":"\u003ch2\u003eCvk Main Jet (#148) for 139QMB and GY6 Engines\u003c\/h2\u003e\u003cp\u003eThis Cvk Main Jet (#148) suits scooters and mopeds running 139QMB or GY6 engines. It works with a range of CVK carburetors that have a 5mm main jet slot. Because it controls how much fuel reaches the engine, it plays a big role in overall performance. You can find it among the \u003ca href=\"\/collections\/scooter-carburetors\"\u003escooter carburetors \u0026amp; jets\u003c\/a\u003e used to fine-tune throttle response and fuel economy.\u003c\/p\u003e\u003ch3\u003eBuild and Specifications\u003c\/h3\u003e\u003cp\u003eThe jet uses a Keihin round design, which gives it a secure fit and dependable operation. It has an M5x0.80 thread and measures 8mm overall. Its precise dimensions allow for fine jetting changes, though dialing in the right setting often takes some testing.\u003c\/p\u003e\u003ch3\u003eSigns You Should Swap the Main Jet\u003c\/h3\u003e\u003cp\u003eConsider replacing the main jet if the scooter accelerates poorly, cuts out, or runs unevenly. After altering the engine or carburetor, you may need to retune with a different jet to restore good running.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Keihin Style\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e M5x0.80 Thread\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 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 (engine codes 139QMA, 139QMB, 1P39QMB, 1P39QMA-2, YN139QMB, JJ1P39QMB, 139FMA-2, BD1P39QMB, BN139QMB, 147QMD, other QMA and QMB models)\u003c\/li\u003e\n\u003cli\u003e157QMJ-based 125cc\/150cc\/169cc engines (engine codes 157QMJ, 161QMK, 152QMI, 1P61QMK, YN1P57QMJ, 1P52FMI, 154FMI, JJ157QMJ, 1P57QMJ, BN157QMJ, BN161QMK-A, other QMJ, QMK and QMI models)\u003c\/li\u003e\n\u003cli\u003eAny engine code with QM or FM and a 5mm main jet slot CVK carburetor\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eHow to choose:\u003c\/strong\u003e Confirm that your CVK carburetor has a 5mm main jet slot and an M5x0.80 thread, then select the jet size your engine calls for. Finding the best size usually involves some trial and error.\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":"Trend Times Toy Stores","offers":[{"title":"Default Title","offer_id":51138616164409,"sku":"TT-26424","price":3.58,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0665\/3358\/9049\/files\/cvk-main-jet-148-1.jpg?v=1794376401","url":"https:\/\/www.trendtimes.com\/products\/cvk-main-jet-148-for-scooters-mopeds","provider":"Trend Times Toy Stores","version":"1.0","type":"link"}