{"product_id":"main-jet-120-si-carbs-for-scooters-mopeds","title":"Main Jet #120, SI Carbs for Scooters \u0026 Mopeds","description":"\u003ch2\u003eMain Jet #120 for SI Carbs in Scooters and Mopeds\u003c\/h2\u003e\u003cp\u003eThe Main Jet #120 is an essential tuning part for SI carburetors used in many scooters and mopeds. This small, cone-shaped piece sits at the bottom of the main jet and governs how much fuel passes through, which affects how well the engine runs. If your engine setup changes, this is one of the \u003ca href=\"\/collections\/scooter-carburetors\"\u003ecarburetor parts and jets for scooters\u003c\/a\u003e you might need to adjust.\u003c\/p\u003e\u003ch3\u003eWhat Main Jets Do\u003c\/h3\u003e\u003cp\u003eMain jets are sold in a range of sizes, usually from 82 to 165. Vintage Vespas generally call for jets between 85 and 116, while engines built for more power often need larger sizes to supply the extra fuel they burn. Picking the right size matters for getting the correct fuel-to-air ratio, which keeps your scooter or moped running smoothly and efficiently.\u003c\/p\u003e\u003ch3\u003eDeciding When to Swap the Main Jet\u003c\/h3\u003e\u003cp\u003eYou may need a different main jet after modifying your engine for more performance, or if you notice poor acceleration or higher fuel use. Tuning a jet usually takes some experimenting, so expect to make a few changes before you land on the setting that works best. For help with jetting, look for guides that explain how to choose the right size.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 120\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 SI carburetors (large frame carbs) with a main jet stack, size #120\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eHow to choose:\u003c\/strong\u003e Check the number stamped on the jet and make sure it matches the size your engine calls for. This listing is for size 120. Most vintage Vespas use a size within the 85-116 range.\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":51138605023289,"sku":"TT-26373","price":4.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0665\/3358\/9049\/files\/main-jet-120-si-carbs-1.jpg?v=1794376326","url":"https:\/\/www.trendtimes.com\/products\/main-jet-120-si-carbs-for-scooters-mopeds","provider":"Trend Times Toy Stores","version":"1.0","type":"link"}