{"product_id":"main-jet-109-for-si-carb-for-scooters-mopeds","title":"Main Jet (#109) for SI Carb for Scooters \u0026 Mopeds","description":"\u003ch2\u003eMain Jet (#109) for SI Carburetors in Scooters and Mopeds\u003c\/h2\u003e\u003cp\u003eThis cone-shaped piece sits at the bottom of the main jet stack inside scooter and moped carburetors. Its job is to meter fuel flow, and it is available in sizes from 82 to 165. Vintage Vespas generally run jets between 85 and 116, while engines that have been modified for more performance may call for larger jets to supply more fuel. If you are browsing for other options, see our \u003ca href=\"\/collections\/scooter-carburetors\"\u003escooter carburetors \u0026amp; jets\u003c\/a\u003e range.\u003c\/p\u003e\u003ch3\u003eHow the Main Jet Works\u003c\/h3\u003e\u003cp\u003eThe main jet sets how much fuel gets mixed with incoming air in the carburetor, which has a direct effect on how the engine runs. Many riders try a few different sizes before settling on the one that suits them best. Whether you are running a stock setup or tuning for extra power, picking the right jet size is key to getting fuel delivered correctly.\u003c\/p\u003e\u003ch3\u003eSigns It May Be Time to Change the Main Jet\u003c\/h3\u003e\u003cp\u003eTake a look at the main jet whenever you are tuning the engine or if the scooter or moped is running poorly. If the machine has been modified or seems to be short on fuel, moving to a larger jet could be needed. Checking it regularly helps confirm that the engine is getting the right amount of fuel.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e #109\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePosition:\u003c\/strong\u003e Bottom of main jet stack\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e SI carburetors for scooters and mopeds, #109 main jet\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eHow to choose:\u003c\/strong\u003e Pick the jet whose number matches what your carburetor needs. Sizes run from 82 to 165, and most vintage Vespas use 85 to 116.\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":51138631041081,"sku":"TT-26464","price":4.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0665\/3358\/9049\/files\/main-jet-109-for-si-carb-1.jpg?v=1794376457","url":"https:\/\/www.trendtimes.com\/products\/main-jet-109-for-si-carb-for-scooters-mopeds","provider":"Trend Times Toy Stores","version":"1.0","type":"link"}