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Neutral Sensor (Gearbox Switch Drive) O-Ring Seal – Various Hyosung Models

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

£4.99

💎 NEUTRAL SENSOR O-RING SEAL // NO MORE OIL WEEPS

No more mystery oil drips. This small, genuine-spec O-ring is a critical maintenance item. It stops oil weeping from the gearbox/stator area that can spray onto your rear tyre—a simple fix for peace of mind on everyday roads.

  • Safety // Prevents messy oil spray near the rear tyre caused by old, flattened factory seals.
  • Aftermarket // Direct-fit replacement quality manufactured to replicate genuine specification sizes accurately.
  • Reliability // Essential service piece to install whenever refreshing an active switch or performing a casing overhaul.
  • Installation // Clean swap component that replaces flattened rubber to avoid major engine cleanup work down the line.
💡 TIP: This O-Ring sits behind the sensor located under the front sprocket cover. Don’t overtighten the sensor housing when reinstalling—the engine casings are aluminium and can strip easily!
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Description

Over time, the neutral sensor’s rubber O-ring becomes flat and hard due to engine heat cycles and accumulated age. This degradation can lead to a slight oil weep that riders often mistakenly confuse with a major sprocket shaft leak. This genuine-spec replacement provides the reliable seal needed to keep your engine oil exactly where it belongs. It is a highly affordable but necessary part for maintaining your casing cleanly and ensuring your daily travels remain completely safe.

💎 SEALING SPECIFICATIONS

Stops LeaksPrevents messy oil mists from coating the front sprocket region. Heat ResistantBuilt to withstand high internal temperatures without flattening prematurely.
Direct FitGuaranteed sizing profile designed for a clean, leak-free seat. Easy InstallSimple swap-and-go maintenance task during any standard oil service.

📜 Confirmed Fitment Guide

Gearbox Switch Group: Broad drop-in fitment verified across the classic generation engine families detailed below.

  • GT Sport & Naked: GT125, GT125R, GT250, GT250R, GT650, and GT650R lines including carburetor and early EFi variants from 2003 to 2021.
  • GV Cruiser Lines: Classic GV125, GV250, and GV650 Aquila cruisers alongside ST7 models up to roughly 2018.
  • Single Cylinder: GD250N, GD250R, RX125, and RT125D Karion machines.
❌ WILL NOT FIT THESE MOTORCYCLES:

  • Hyosung GV125S / GV300S Aquila Bobber: Modern post-2019 engine casing revisions utilize an entirely reworked sensor layout and different sealing setups.
💡 MAINTENANCE REMINDER: Since your work requires removing the sprocket guard anyway, it is the ideal time to examine your overall chain tension and rear sprocket health. Check out our high-tensile final drive options for a definitive replacement. View Chain Kits here.

🔧 Install Tips

  • Gentle Removal: Carefully back out the old sensor switch. The plastic connector housing can become brittle over years of heat exposure.
  • Lube the Seal: Rub a tiny dab of fresh motor oil onto the replacement rubber ring surface. This allows it to slide cleanly into the crankcase recess without rolling or tearing.
  • Hand Tighten First: Spin the mounting fasteners completely home by hand, then apply a tiny final nip with a spanner. Avoid heavy force to prevent threads stripping out.
  • Manufacturer Reference Cross-Match: Directly matches factory parts catalogue code 09280-26003.
📧 NEED HELP IN THE SPROCKET AREA? Not sure if this seal matches your switch dimensions? Email us for direct support or if you want advice from club peers, head straight to the forums.

Additional information

Weight 0.2 kg
Dimensions 10 × 10 × 2 cm

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