{"product_id":"cvk-main-jet-145-for-scooters-mopeds","title":"Cvk Main Jet (# 145) for Scooters \u0026 Mopeds","description":"\u003ch2\u003eCvk Main Jet #145 for GY6 and 139QMB Scooters\u003c\/h2\u003e\u003cp\u003eThe Cvk Main Jet (#145) is made for 139QMB and GY6 scooters and mopeds, and it fits carburetors that take a 5mm main jet. It helps fine-tune your scooter's fuel system and can contribute to better engine performance. You'll find it among other \u003ca href=\"\/collections\/scooter-carburetors\"\u003escooter carburetors \u0026amp; jets\u003c\/a\u003e that affect engine efficiency. Getting the jetting just right often takes some testing, so it pays to be patient while tuning.\u003c\/p\u003e\u003ch3\u003eBuild and Fit Details\u003c\/h3\u003e\u003cp\u003eThis main jet uses a Keihin round design and has an M5x0.80 thread. Its overall length is 8mm, so it works with a broad range of engines. If your engine code includes \"QM\" or \"FM\" and your carburetor is set up for a 5mm main jet, this part will most likely suit your setup.\u003c\/p\u003e\u003ch3\u003eSigns It May Be Time to Swap the Main Jet\u003c\/h3\u003e\u003cp\u003eThink about replacing the main jet if the engine behaves unpredictably, for example by accelerating slowly or idling unevenly. Changing the jetting can noticeably alter the fuel-air ratio, which may improve throttle response and efficiency. For guidance on finding the best setting for your needs, refer to jetting instructions.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Keihin round design\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\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\u003eCompatibility\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 with engine code containing 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 Find your engine code in the list above and confirm your carburetor has a 5mm main jet slot. This jet has an M5x0.80 thread and an 8mm overall length.\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":51138611413049,"sku":"TT-26414","price":3.58,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0665\/3358\/9049\/files\/cvk-main-jet-145-1.jpg?v=1794376386","url":"https:\/\/www.trendtimes.com\/products\/cvk-main-jet-145-for-scooters-mopeds","provider":"Trend Times Toy Stores","version":"1.0","type":"link"}