{"product_id":"main-jet-103-for-si-carbs-for-scooters-mopeds","title":"Main Jet #103 for SI Carbs for Scooters \u0026 Mopeds","description":"\u003ch2\u003eMain Jet #103 for SI Carburetors in Scooters and Mopeds\u003c\/h2\u003e\u003cp\u003eThe Main Jet #103 is a critical component for the tuning of SI carburetors used in scooters and mopeds. This small, cone-shaped jet controls the fuel flow from the main jet stack. It is designed for a variety of engine types, particularly in vintage Vespas, where it typically fits models requiring jets in the 85-116 range. This part is one of the \u003ca href=\"\/collections\/scooter-carburetors\"\u003escooter carburetors \u0026amp; jets\u003c\/a\u003e that can significantly affect engine performance and fuel efficiency.\u003c\/p\u003e\u003ch3\u003eFunctionality and Performance\u003c\/h3\u003e\u003cp\u003eThe Main Jet influences the amount of fuel entering the combustion chamber. The size of the jet directly correlates with fuel flow; larger numbers allow for more fuel. Riders often experiment with different jet sizes to achieve the best performance, especially in modified engines that may require larger jets for better fuel delivery.\u003c\/p\u003e\u003ch3\u003eInstallation and Adjustment\u003c\/h3\u003e\u003cp\u003eReplacing the Main Jet involves removing the existing jet and installing the new one in its place. It is a straightforward task that can be performed at home with basic tools. Keep in mind that finding the right jet size may require some trial and error, so be prepared to test different options for ideal performance.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 103\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePosition:\u003c\/strong\u003e Main jet stack\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e SI carburetors for scooters and mopeds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eThis Main Jet #103 is compatible with various scooters and mopeds utilizing SI carburetors. It is particularly suited for vintage Vespa models.\u003c\/p\u003e\u003cul\u003e\u003cli\u003eVespa\u003c\/li\u003e\u003c\/ul\u003e\u003cp\u003eNot sure it fits? Contact us with your scooter's make, model and year and we'll confirm the fit 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":"Magic Cars","offers":[{"title":"Default Title","offer_id":52800328794343,"sku":"25-913596","price":5.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2245\/9711\/files\/main-jet-103-for-si-carbs-1.jpg?v=1791665477","url":"https:\/\/www.magiccars.com\/products\/main-jet-103-for-si-carbs-for-scooters-mopeds","provider":"MagicCars","version":"1.0","type":"link"}