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What is the purpose of this piece?
The adjustment screw is the key component to refine your control according to the path of the circuit:
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Preload management: Its role is to compress more or less the standing spring.
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By screwing: You compress the spring, the valve offers more resistance and opens later (more "coupleux" at the bottom).
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By unscrewing: The spring is more free, the valve opens earlier (more "bright" engine in the towers).
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Clicks lock: The screw is designed to provide notches (clicks) perceptible. This allows the driver or mechanic to memorize specific settings and return to a known basis from one session to another.
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Ergonomics: Its knurled shape allows a quick hand adjustment, even with gloves, without the need for tools, ideal for adjusting its engine behavior directly in the stands or the pre-grid.
💡 Michel's trick
"Listen well, that's where the tenths earn! The standard setting is often between 12 and 14 clicks Starting from the closed position (screwed thoroughly). But beware: if you unknown too much, the screw can end up jumping with the vibrations. My secret? Always make a small white felt mark on the top of the screw to see at a glance if it turned alone during your sleeve! "
🎓 Tuto: how to adjust your valve screw?
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Basic setting: Screw the knob with a clockwise direction (without forceing like a beef to the end so as not to mark the plastic).
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Adjustment: Unscrew the desired number of clicks.
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Sinuous / slow track: Screw more (Farm Valve) to prevent it from opening too early in tight turns.
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Fast track / long straight line: Unscrew (flexible valve) for the engine to "take turns" as soon as possible.
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Verification of the seal: Make sure the small O-ring located under the screw is in good condition. If he is dead, the screw can loosen alone or let out the pneumatic pressure.
- Cleaning the thread: If the screw becomes hard to turn, do not force. Disassemble it and clean the thread of the cover and the screw, because the gum dust often lodges there.
RX641890
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CYLINDRE ROTAX SENIOR MAX 54,000 - 54,010MM
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The Adjustment screw, located at the top of the valve hood, is the direct interface between the driver and the engine. By screwing it or by unscrewing it, the preload of the internal spring is modified, which defines which precise regime will open to release all the power of the Rotax.
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