Carburettor Carb Air Mixture Pilot Screw x1 (CO Adjuster) – Hyosung GV125 GT125 GTR GV250 GT250

Description

The air mixture pilot screw is responsible for fine-tuning your engine speed balance and off-throttle fueling response. On twin-cylinder carbs, these long brass adjusters are frequently found seized solid, snapped off by bad tools, or stacked with missing internal seals. This slow maintenance reality allows raw air leaks to disrupt the lower fuel circuitry—which is the number one cause of rough idling issues. Sourcing this premium aftermarket Hyosung pilot mixture screw set provides the full 4-piece hardware kit required to lock down your settings. It seals your tuning paths properly, ensuring your engine runs smooth and true on local roads during your latest restoration project.

This overhaul kit is far more than a basic replacement screw. The inclusion of the ultra-delicate washer and tiny rubber O-ring is exactly what sets this package apart from general hardware options. These two tiny parts prevent air from bypassing the thread channels—a massive failure point when owners reuse flattened original seals. Whether you are dealing with a sheared tip or performing a complete carburetor clean-out, this is the factory-correct tuning solution.

💎 LOW-SPEED GEARING HYOSUNG PILOT MIXTURE SCREW SPECIFICATIONS

📜 Confirmed Fitment Guide (Carburettor Models Only)

🔧 Install Tips

• Follow the Critical Stack Order: To avoid tearing the rubber or causing major air leaks, you must stack the hardware onto the tip in this exact order: Screw ➜ Spring ➜ Washer ➜ O-ring. The metal washer acts as a shield to stop the rotating spring tail from chewing through the soft rubber material!
• Use a Highly Gentle Touch: Thread the brass needle down into the channel using a flat screwdriver tool until you feel the nose *just* touch the internal seat. Never force it tight. Over-cranking will instantly snap the delicate pointed tip off inside your alloy carb body casting.
• Set Your Base Baseline Range: Carefully wind the screw back out exactly 2.5 full turns from seated to use as your starting baseline tune. Execute your final 1/8th turn tweaks later while the engine is running at full operational temperature.