{"product_id":"cvk-main-jet-108-for-scooters-mopeds","title":"Cvk Main Jet (# 108) for Scooters \u0026 Mopeds","description":"\u003ch2\u003eCvk Main Jet (#108) for 139QMB and GY6 Scooters\u003c\/h2\u003e\u003cp\u003eThe Cvk Main Jet (#108) is a key component for a range of scooters and mopeds that use 139QMB and GY6 engines. It works with almost any CVK carburetor that has a 5mm main jet slot. The jet helps control engine performance and fuel flow, so it is worth a look among the \u003ca href=\"\/collections\/scooter-carburetors\"\u003escooter carburetors \u0026amp; jets\u003c\/a\u003e available for your machine. Getting the jetting right can take some trial and error, so check any available jetting guides before you start.\u003c\/p\u003e\u003ch3\u003eBuild and Fit Details\u003c\/h3\u003e\u003cp\u003eThis main jet uses the Keihin round design and has an M5x0.80 thread, which keeps it snug inside the carburetor. It measures 8mm overall in length. It suits a broad group of engines, including 50cc, 80cc, 125cc, 150cc, and 169cc units that carry specific engine codes.\u003c\/p\u003e\u003ch3\u003eSigns It May Be Time to Swap the Main Jet\u003c\/h3\u003e\u003cp\u003eConsider changing the main jet if the engine runs poorly or if the fuel-air mix needs adjusting to get more power out of it. Checking the jet from time to time can show whether a new one is needed, especially when you are modifying or upgrading the scooter.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Keihin round-style 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\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\u003e139QMA, 139QMB, 1P39QMB, 1P39QMA-2, YN139QMB, JJ1P39QMB, 139FMA-2, BD1P39QMB, BN139QMB, 147QMD engines (50cc\/80cc)\u003c\/li\u003e\n\u003cli\u003eOther QMA and QMB engines (50cc\/80cc)\u003c\/li\u003e\n\u003cli\u003e157QMJ, 161QMK, 152QMI, 1P61QMK, YN1P57QMJ, 1P52FMI, 154FMI, JJ157QMJ, 1P57QMJ, BN157QMJ, BN161QMK-A engines (125cc\/150cc\/169cc)\u003c\/li\u003e\n\u003cli\u003eOther QMJ, QMK and QMI engines (125cc\/150cc\/169cc)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eHow to choose:\u003c\/strong\u003e Only use this jet with a CVK carburetor that has a 5mm main jet slot, M5x0.80 threads, 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":51138621014073,"sku":"TT-26437","price":3.58,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0665\/3358\/9049\/files\/cvk-main-jet-108-1.jpg?v=1794376419","url":"https:\/\/www.trendtimes.com\/products\/cvk-main-jet-108-for-scooters-mopeds","provider":"Trend Times Toy Stores","version":"1.0","type":"link"}