{"product_id":"tusk-cold-start-jet-kit-for-kawasaki-klx140r-klx140-main-pilot-jets-98-40-improved-cold-starts-low-speed-throttle","title":"TUSK Cold Start Jet Kit for Kawasaki KLX140R\/KLX140 Main \u0026 Pilot Jets 98\/40 — Improved Cold Starts \u0026 Low-Speed Throttle","description":"\u003cp\u003e\u003cstrong\u003eTusk Cold Start Jet Kit replaces factory pilot and main jets to improve cold-start behavior and low-speed throttle control on compatible KLX140 series carburetors.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWhen temperatures drop or after long idle periods, small-block carburetors on Kawasaki KLX140R F\/L (2021–2026) and KLX140\/L (2008–2020) can be slow to return crisp throttle response and stable idle. The Tusk Cold Start Jet Kit offers a simple, reversible carburetor adjustment—two replacement jets sized to refine fuel metering during warm-up without changing the carburetor body. Built from durable materials for direct fitment, this kit targets riders who want fewer choke cycles and steadier low-speed performance on trail and recreational rides.\u003c\/p\u003e\n\n\u003ch3\u003eHow will these jets change cold starts and choke use?\u003c\/h3\u003e\n\u003cp\u003eInstalling the included jets shifts the fuel mixture during engine warm-up to reduce the amount of enrichment required from the choke. That often means the engine reaches a stable idle sooner and the rider spends less time running the choke or blipping the throttle to clear a rich condition. Results vary with altitude, ambient temperature and carburetor condition, but the intent is more consistent starts under typical trail conditions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIncludes a slightly leaner pilot jet for crisper idle as the engine warms.\u003c\/li\u003e\n  \u003cli\u003eMain jet re-sizing improves throttle response during first minutes of operation.\u003c\/li\u003e\n  \u003cli\u003eHelps shorten choke run time in most mild to moderate temperature ranges.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill installation require special tools or tuning experience?\u003c\/h3\u003e\n\u003cp\u003eBasic hand tools and a modest level of mechanical comfort are sufficient to swap these jets into most compatible carburetors. Removal and replacement are straightforward: drain fuel or block the petcock, remove the float bowl, and change the jets with the correct driver. If you haven’t serviced a carburetor before, a Tusk Carburetor Rebuild Kit and a mini carb tool kit can make the job easier and help ensure proper sealing.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDirect-replacement sizing requires no custom modifications to the carb body.\u003c\/li\u003e\n  \u003cli\u003eStandard screwdrivers or jet drivers handle the swap; no special equipment needed.\u003c\/li\u003e\n  \u003cli\u003ePair with a Tusk rebuild kit for worn gaskets, seals, and a complete refresh.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat exact jet sizes are included and why do they matter?\u003c\/h3\u003e\n\u003cp\u003eThe kit contains a 98 main jet and a 40 pilot jet selected to alter fuel delivery characteristics at both idle\/low-speed and part-throttle conditions. The pilot jet governs mixture at idle and just off-idle, while the main jet affects mid- to high-throttle fueling. Choosing the correct sizes helps the carburetor run more predictably until the engine reaches normal operating temperature.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e98 main jet for improved mid-throttle progression during warm-up.\u003c\/li\u003e\n  \u003cli\u003e40 pilot jet for a more stable idle and reduced bogging at low speeds.\u003c\/li\u003e\n  \u003cli\u003eSized to work as a straightforward tune for KLX140-compatible carburetors.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAre there regulatory or compatibility notes I should know?\u003c\/h3\u003e\n\u003cp\u003eThis jet kit is intended for off-road and recreational use on compatible carburetors and is not CARB compliant for certain emissions-controlled applications. Confirm model-year compatibility (Kawasaki KLX140R F\/L 2021–2026 and KLX140\/L 2008–2020) and ensure your carburetor accepts standard pilot and main jet sizes. If your motorcycle must meet specific emissions regulations, check local rules before modifying fuel-system components.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eNon-CARB compliant—check local emissions requirements before installation.\u003c\/li\u003e\n  \u003cli\u003eDesigned as a swap-in for compatible stock carburetor jet locations.\u003c\/li\u003e\n  \u003cli\u003ePair with maintenance items for best long-term performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The Tusk Cold Start Jet Kit is aimed at KLX140 owners and recreational riders who want a simple, reversible upgrade to reduce choke time and improve low-speed drivability during engine warm-up. It’s best for riders comfortable with basic carburetor service or those planning a tune-up using Tusk’s rebuild and tool kits. If you ride trails, practice in variable temperatures, or simply want a more dependable cold-start routine, this kit is a low-cost, straightforward option.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will this kit fit my KLX140 carburetor?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes—it's designed for Kawasaki KLX140R F\/L (2021–2026) and KLX140\/L (2008–2020) carburetors that use standard pilot and main jets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do I need a tune after installing these jets?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Most users won’t need further tuning; however, adjustments may be necessary for extreme altitude or custom exhaust and intake setups.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"TUSK","offers":[{"title":"Default Title","offer_id":48084514046110,"sku":"B09PC7ZZF1","price":31.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/tusk-front-view-jet-kit.jpg?v=1785858341","url":"https:\/\/northtrailauto.ca\/products\/tusk-cold-start-jet-kit-for-kawasaki-klx140r-klx140-main-pilot-jets-98-40-improved-cold-starts-low-speed-throttle","provider":"North Trail Auto","version":"1.0","type":"link"}