Description
The standard factory paper air elements on your bike are highly restrictive and degrade rapidly over months of weather exposure. Combined with the lean factory fuel settings, the standard setup leaves your motor choked for both air and fuel. This Stage 1 performance bundle addresses that slow maintenance reality by vastly expanding airflow pathways and correcting the air-fuel mixture right out of the box. The immediate result is smoother power delivery through the rev limits, much easier cold starting on damp mornings, and a snappier throttle response on local roads.
We use premium European-made DNA or BMC filters inside this kit due to their superior structural build quality, easily washable mesh design, and top-tier filtration capabilities. The included stainless hex hardware adds excellent rust protection and a clean polished look to your engine bay area during your intake rebuild. This provides an excellent one-time upgrade path since the old US imports have ended production.
💎 INDUCTION TUNING HYOSUNG 250 TUNING KIT SPECIFICATIONS
| European High-Flow ElementWashable, reusable fabric mesh that flows significantly more air than basic paper. | Calibrated Fuel Main JetsSize 95 for the front and 97.5 for the rear to protect against lean engine running. |
| Optimised Torque GainsBalances the fuel curve to add noticeable mid-range punch and smooth throttle lift. | Rustproof Hex BoltsTwelve stainless screws to secure your bottom float bowls and airbox frame lips safely. |
📜 Confirmed Fitment Guide
250cc Carburettor Model Group: Custom jet sizes are matched exclusively for the non-injected twin engine layouts noted below. See the diagram picture for airbox track routes.
- Hyosung GT250 Comet Naked: Fits classic unfaired twin carb models.
- Hyosung GT250R Sports: Fits faired twin carb models.
- EFI Fuel Injection: This will strictly not fit later electronic injection models. They do not use carbs.
Riding a Smaller Twin? If you are working on a 125cc bike instead, click here for the correct 125cc version.
🔧 Install Tips
- Accessing the Main Jet Slots: You will need to drop your bottom float bowls off to swap your stock fuel nozzles for our uprated sizes. If you aren’t sure how to separate the assemblies on your workbench, head straight to the forums to view our full jet install guide.
- Check Internal Valve Seats: While you have the carb bowls unbolted and open for the jet swap, take a close look at your plastic float wings and metal needle pins to confirm everything is clean and free of sticky fuel varnish.
- Lock the Airbox Seals Flat: Use our supplied unrustable stainless steel cover bolts when putting your air filter housing back together. Tighten them down evenly to guarantee an absolute air-tight seal around the airbox lip.
Bespoke Transparent "Clear View" Clutch Cover - Hyosung GT/GV 125 250 





















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