{"product_id":"main-jet-78-for-sha-shb-carbs-for-scooters-mopeds","title":"Main Jet #78 for SHA\/SHB Carbs for Scooters \u0026 Mopeds","description":"\u003ch2\u003eMain Jet #78 for Vespa Small Frame Scooters and Mopeds\u003c\/h2\u003e\u003cp\u003eThis #78 main jet suits Vespa small frame scooters running 16mm and 19mm carburetors, and it also works with PHBG models. The jet controls how much fuel moves through the carburetor, so it plays a key role in the fuel supply. You can find it alongside other \u003ca href=\"\/collections\/scooter-carburetors\"\u003escooter carburetors \u0026amp; jets\u003c\/a\u003e. When it is matched to your setup, it can help the engine respond better at the throttle and run more efficiently.\u003c\/p\u003e\u003ch3\u003eHow Main Jets Work\u003c\/h3\u003e\u003cp\u003eMain jets sit in the fuel delivery path of a scooter. Fuel flows through the jet once the needle is raised, which sets the air-to-fuel ratio the engine receives. Sizes run from 37 to 88, so you can adjust the tuning to suit your riding style and the conditions you ride in.\u003c\/p\u003e\u003ch3\u003eFitting and Tuning\u003c\/h3\u003e\u003cp\u003eSwapping the main jet means taking the carburetor off, and getting the setting right may take a few attempts. Reading up on jetting methods before you start is a good idea so you can set things correctly. Changing the jet can noticeably alter how the engine performs, particularly when conditions shift.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 78\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePosition:\u003c\/strong\u003e Main jet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Small Frame Vespa scooters with SHA\/SHB carbs (16mm and 19mm), also PHBG carbs\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSmall Frame Vespa (16mm and 19mm SHA\/SHB carbs)\u003c\/li\u003e\n\u003cli\u003eSmall Frame Vespa with PHBG carbs\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eHow to choose:\u003c\/strong\u003e Install it where your carburetor specifies a #78 main jet. Main jets range from 37 to 88, so read the size stamped on your current jet 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":"Trend Times Toy Stores","offers":[{"title":"Default Title","offer_id":51138504556601,"sku":"TT-25793","price":3.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0665\/3358\/9049\/files\/main-jet-78-for-sha-shb-carbs-1.jpg?v=1794375486","url":"https:\/\/www.trendtimes.com\/products\/main-jet-78-for-sha-shb-carbs-for-scooters-mopeds","provider":"Trend Times Toy Stores","version":"1.0","type":"link"}