{"product_id":"main-jet-51-for-sha-shb-carbs-for-scooters-mopeds","title":"Main Jet #51 for SHA\/SHB Carbs for Scooters \u0026 Mopeds","description":"\u003ch2\u003eMain Jet #51 for Small Frame Vespas and PHBG Carbs\u003c\/h2\u003e\u003cp\u003eThis #51 main jet suits small frame Vespas fitted with 16mm or 19mm carburetors, along with PHBG carburetors. Within the scooter's fuel system it has a direct effect on both how the engine performs and how efficiently it uses fuel. You can find it alongside other \u003ca href=\"\/collections\/scooter-carburetors\"\u003ecarburetor and jet options\u003c\/a\u003e when fine-tuning your scooter's carb setup. Several sizes are offered, and this one is well suited to riders looking to refine how their scooter runs.\u003c\/p\u003e\u003ch3\u003eHow Main Jets Work\u003c\/h3\u003e\u003cp\u003eMain jets sit at the heart of a scooter's fuel delivery. They meter how much fuel reaches the engine, which in turn shapes overall performance. On small frame Vespas, the fuel system pairs a main jet with an idle jet. This particular size is intended for adjusting performance, especially acceleration and how quickly the scooter responds when you twist the throttle.\u003c\/p\u003e\u003ch3\u003eSigns It May Be Time to Swap\u003c\/h3\u003e\u003cp\u003eIf acceleration feels weaker than usual or the throttle response has dropped off, a main jet change may be worth considering. Getting jetting right usually takes testing and small adjustments. For guidance on getting the best result from your particular setup, check the jetting instructions so your scooter keeps running smoothly.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e #51\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 Vespa small frame scooters with SHA\/SHB 16mm and 19mm carburetors, and PHBG carburetors\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eCompatible with:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eVespa small frame (SHA\/SHB 16mm carburetor)\u003c\/li\u003e\n\u003cli\u003eVespa small frame (SHA\/SHB 19mm carburetor)\u003c\/li\u003e\n\u003cli\u003eVespa small frame (PHBG carburetor)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSelecting the right one:\u003c\/strong\u003e Pair the main jet with your carburetor type: 16mm or 19mm SHA\/SHA carbs, or a PHBG carb. Jet sizes range from #37 to #88, and finding the right size usually involves some trial and error.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eBrowse further:\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":51138603909177,"sku":"TT-26367","price":3.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0665\/3358\/9049\/files\/main-jet-51-for-sha-shb-carbs-1.png?v=1794376314","url":"https:\/\/www.trendtimes.com\/products\/main-jet-51-for-sha-shb-carbs-for-scooters-mopeds","provider":"Trend Times Toy Stores","version":"1.0","type":"link"}