030103643 Volkswagen JET

A jet valve basically controls the amount of fuel that gets delivered to the carburetor's main jet at idle and low speeds. It’s a small, adjustable needle valve. Think of it like a fine – tuning knob for your fuel mixture. It doesn't handle all the fuel, just that initial bit when you’re starting up or idling. It mixes air and fuel, and the valve adjusts the ratio. It’s part of the carburetor system, and you'll find it on many older vehicles and some smaller engines – things like motorcycles, ATVs, even some lawnmowers. It’s positioned right before the main jet, metering fuel to keep the engine running smoothly when it’s cold or at low RPMs. It works with other components like the idle mixture screw to dial in the perfect air/fuel ratio. If it fails or gets clogged, you'll notice if your engine is hard to start, idles roughly, stalls easily, or just doesn't run smoothly at low speeds. It acts like a shield protecting your engine from running too lean, which can cause overheating and damage. Getting the fuel mixture right is crucial for engine performance and longevity. If you’re rebuilding a carburetor, it’s definitely something you want to inspect and replace if needed. You can often find a replacement jet valve at places like Fixparts Online, and they’re usually pretty straightforward to install if you're comfortable working on carburetors. Technical support you can rely on: Jet Valve (MPN 030103643) comes with a 12-month warranty!

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