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Everything Dirt Bike
General Dirt Bike
Float Height
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<blockquote data-quote="SRAD97750" data-source="post: 210089" data-attributes="member: 425"><p>The height of the fuel in the carburetor bowl, jet passages, and effectively the fuel's 'distance from the venturi' is determined by the float. The engine uses vacuum to pull the fuel and air into the cylinder through the jet passages and intake tract.</p><p></p><p>The closer the fuel is to the venturi or 'jet passage outlet' the easier it is for the engine's vacuum to pull the fuel into the venturi. If the float height is set higher, the mix will get richer because the vacuum can more easily pull fuel the shorter distance. Gravity plays a role in this distance and energy required to overcome it.</p><p></p><p>Another way to look at it is that the metering portion of the jet is at the intake point, the lowest point submerged in the fuel. So technically, the jet only 'meters' the replenishment of the jet passage. The actual quantity of fuel allowed to be set as 'static' in the passages, by the float, makes the circuit richer or leaner inherently. -BIG DAN<img src="https://www.dirtbikeaddicts.com/static/images/smilies/thumb.gif" class="smilie" loading="lazy" alt=":thumb:" title="Thumb :thumb:" data-shortname=":thumb:" /></p></blockquote><p></p>
[QUOTE="SRAD97750, post: 210089, member: 425"] The height of the fuel in the carburetor bowl, jet passages, and effectively the fuel's 'distance from the venturi' is determined by the float. The engine uses vacuum to pull the fuel and air into the cylinder through the jet passages and intake tract. The closer the fuel is to the venturi or 'jet passage outlet' the easier it is for the engine's vacuum to pull the fuel into the venturi. If the float height is set higher, the mix will get richer because the vacuum can more easily pull fuel the shorter distance. Gravity plays a role in this distance and energy required to overcome it. Another way to look at it is that the metering portion of the jet is at the intake point, the lowest point submerged in the fuel. So technically, the jet only 'meters' the replenishment of the jet passage. The actual quantity of fuel allowed to be set as 'static' in the passages, by the float, makes the circuit richer or leaner inherently. -BIG DAN:thumb: [/QUOTE]
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