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.
- Hyosung GV125S / GV300S Aquila Bobber: Modern post-2019 engine casing revisions utilize an entirely reworked sensor layout and different sealing setups.
🔧 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.












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