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Carburettor Float Valve Screw x2 [Carb Bolt] – Hyosung GT125 GTR GV250 GT250R GV125

Estimated delivery dates: Aug 28, 2026 - Aug 29, 2026

£4.99

🛠️ MIKUNI-TYPE FLOAT VALVE SCREWS (X2) // REBUILD ESSENTIALS

Ditch the rounded, rusty fasteners inside your fuel bowls. These replacement screws lock your inlet housing secure, making a fresh Hyosung carb valve screw pair the smartest way to ensure stable fuel lines during your next service project.

  • Retention // Holds the entire gold needle seat completely still to eliminate flooding or fuel starvation.
  • Tolerance // Machined accurately to fit the delicate internal threads of soft alloy fuel mixing bodies.
  • Pair // Arrives as a set of two screws to update both your front and rear chambers.
  • In Stock // Ready for your next oil change.
⚠️ PRO TIP: These tiny fasteners are very delicate! Always use a proper JIS cross head tool. Standard western drivers are the number one cause of these heads rounding out on the workbench.

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Description

When performing a complete overhaul on your 125cc or 250cc v-twin carbs, the tiny hardware details make the entire difference between a successful workbench tune and a deeply frustrating fuel leak. The internal needle seat clamping screw holds your entire fuel metering block firmly in position; if this factory fastener is sitting loose, rounded off by bad tools, or rotted with green scaling, your fuel bowl levels will never remain stable. Choosing this premium aftermarket Hyosung carb valve screw pack is a vital maintenance win. These parts provide an exact one-to-one dimension match for the original hardware, delivering a completely secure, reliable anchoring fix inside your carbs.

Do not settle for “near enough” coarse screws from a local hardware outlet that will chew your threads. These fasteners are produced explicitly to match the thread pitch tolerances of original fuel mixer bodies. This guarantees they will not shake loose under heavy engine thumping or damage the soft internal aluminum casting walls during a routine restoration project.

💎 INDUCTION HARDWARE HYOSUNG CARB VALVE SCREW SPECIFICATIONS

Locks the Needle HousingPrevents the brass seat from lifting out of position to stop sudden engine flooding. Twin Carb PackSupplied as a set of two to fully update both of your fuel bodies simultaneously.
Zinc-Plated FinishTough protective outer coat that handles fuel exposure inside the bowl without scaling. True Factory BlueprintTurned accurately to match original manufacturing measurements to replace factory code: 13377HG5100.

📜 Confirmed Fitment Guide (Carburettor Only)

Carburetted V-Twin Engine Group: Thread depth and head clearance match the standard internal towers for the carb models noted below. See the diagram picture for lower float chamber schematics.

  • Hyosung GT125 / GT125R / GT125RC Comet: Fits all traditional twin-carb sport models up to 2020
  • Hyosung GT250 / GT250R Comet: Fits all carb models up to 2009
  • Hyosung GV125 / GV250 Aquila Cruiser: Fits carburetted cruiser layouts (GV125 variants up to 2017).
💡 RECOMMENDED MAINTENANCE BUNDLE PAIRING: If your internal tower screws are completely chewed up or rusted out from old fuel lacquer, your paper gaskets and main fuel nozzles are likely in a bad way too. Restore your full assembly to factory-fresh operation. Combine this hardware pack with our full Carb Rebuild Kit to renew your gaskets, pins, and jets simultaneously on the bench. View Rebuild Kits here.

🔧 Installation Tips

  • Utilize True JIS Tooling: We cannot emphasize this enough—always use a proper Japanese Industrial Standard tool bit to turn these fasteners. A regular western driver bit will cam out under pressure and instantly strip the cross head lines of these small components.
  • Scrub Your Internal Threads: Dip a fine cotton bud into clean spray solution to thoroughly wash out old crust, scaling, or thread lock residue from the alloy casting hole before threading your new parts home.
  • Do Not Overtighten: Brass emulsion parts and aluminum bodies are incredibly soft metals. Wind the screws down gently until they seat flat against the bracket tab, but never force them roughly or you will strip out your internal casting lines entirely.
📧 HAVING TROUBLE EXTRACTING AN OLD STRIPPED SCREW FROM YOUR MIXER TOWER? If your float valve is stuck open or you want to verify your model’s bowl layout before unboxing your kit, you can upload a crisp photo of your open components on the forum to get a fast check from other builders. For fast sales support, email us your question or if you want to find full overhaul walkthroughs, head straight over to the forums.

Additional information

Weight 0.3 kg
Dimensions 20 × 20 × 2 cm

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