{"product_id":"mikuni-large-round-main-jets-4-pk-90-134-7090","title":"Mikuni Large Round Main Jets - 4\/PK #90","description":"\u003cp\u003eGenuine Mikuni large round main jets in #90 size, sold in a 4-pack for carburetor tuning on V-twin motorcycles. These jets meter fuel flow through the main circuit and are essential when rejetting a carb for different air filters, exhausts, or elevation changes.\u003c\/p\u003e\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e4-pack quantity\u003c\/li\u003e\n  \u003cli\u003eGenuine Mikuni OEM jets\u003c\/li\u003e\n  \u003cli\u003eLarge round body style\u003c\/li\u003e\n  \u003cli\u003e#90 size for main circuit tuning\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mikuni\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e FN100604-90\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eJet Size:\u003c\/strong\u003e #90\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 4 per pack\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 4.4 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 2.2 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHeight:\u003c\/strong\u003e 0.6 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.05 lbs\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Japan\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFitment\u003c\/h2\u003e\n\u003cp\u003eFits V-twin motorcycles equipped with Mikuni carburetors using large round main jets.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat does a #90 main jet do?\u003c\/h3\u003e\n\u003cp\u003eThe main jet controls fuel flow in the main circuit — used at cruise and part-throttle RPMs. Upsize for richer mixture, downsize for leaner.\u003c\/p\u003e\n\u003ch3\u003eWhy would I need to rejet?\u003c\/h3\u003e\n\u003cp\u003eAir filter changes, exhaust upgrades, altitude changes, or engine modifications often require rejetting for proper fuel-air ratio and smooth running.\u003c\/p\u003e\n\u003ch3\u003eHow many jets are in a pack?\u003c\/h3\u003e\n\u003cp\u003eFour jets per pack — enough to try different sizes or stock a spare set.\u003c\/p\u003e\n\u003ch3\u003eWill these fit any Mikuni carb?\u003c\/h3\u003e\n\u003cp\u003eThese are large round jets — verify your carb uses large round jets before ordering, as some Mikuni models use different jet body styles.\u003c\/p\u003e","brand":"Mikuni","offers":[{"title":"Default Title","offer_id":53034990469231,"sku":"134-7090","price":20.79,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/6734\/6543\/files\/output_145a5867-f8d3-4290-932c-d79ac25ef815.png?v=1779558726","url":"https:\/\/vtwinbikers.com\/products\/mikuni-large-round-main-jets-4-pk-90-134-7090","provider":"Vtwinbikers","version":"1.0","type":"link"}