{"product_id":"main-jet-155-si-carbs-for-scooters-mopeds","title":"Main Jet #155, SI Carbs for Scooters \u0026 Mopeds","description":"\u003ch2\u003eMain Jet #155 for Classic Vespas and Tuned Scooters\u003c\/h2\u003e\u003cp\u003eThis Main Jet #155 helps control how much fuel reaches the engine through the carburetor. It is made for classic Vespas and also works with tuned scooters that call for larger jets to gain extra output. Because the jet size sets the fuel flow, it is an important element when dialing in your ride. You can find it among other \u003ca href=\"\/collections\/scooter-carburetors\"\u003escooter carburetors \u0026amp; jets\u003c\/a\u003e for building the fuel mix your engine needs. Changing the jet size can sharpen throttle response and improve how efficiently the engine runs.\u003c\/p\u003e\u003ch3\u003eGetting to Know Jet Sizes\u003c\/h3\u003e\u003cp\u003eThe jet sits in the lower part of the main jet stack and has a small conical shape. Available sizes run from 82 to 165, and the #155 is a common pick for performance builds that need more fuel flow. Higher jet numbers let more fuel through, which helps modified engines that run better on a richer mixture.\u003c\/p\u003e\u003ch3\u003eSigns It May Be Time to Swap the Main Jet\u003c\/h3\u003e\u003cp\u003eThink about changing the main jet when you have made engine upgrades or notice performance problems. If the scooter burns more fuel than expected or runs roughly, a different jet size may fix the issue. Finding the right size for your setup often takes trial and adjustment, so plan to test and refine your settings as you go.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 155\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, main jet stack position, size #155\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eHow to choose:\u003c\/strong\u003e Pick a jet size that matches your carburetor's main jet stack. This part is #155, and the sizes offered run from 82 to 165.\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":51138603745337,"sku":"TT-26366","price":3.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0665\/3358\/9049\/files\/main-jet-155-si-carbs-1.jpg?v=1794376312","url":"https:\/\/www.trendtimes.com\/products\/main-jet-155-si-carbs-for-scooters-mopeds","provider":"Trend Times Toy Stores","version":"1.0","type":"link"}