Hyosung GT 125 NAKED (2001) — Specs
Identity
Manufacturer: Hyosung
Model: GT 125 NAKED
Category: Motorcycle
Type: Motorcycle
Years: 2001 →
Engine
Displacement (cc): 124
Cylinders: 2
Power (hp): 14
Power (kW): 11
Torque (Nm): 11
Dimensions
Overall length: 1950 mm
Overall width: 720 mm
Overall height: 1110 mm
Wheelbase: 1340 mm
Ground clearance: 150 mm
Weight (kg): 167
Seat height (mm): 795
Tank (L): 17
Tires
Front tire: 110/70-17
Rear tire: 150/70-17
Front pressure (bar): 2
Rear pressure (bar): 2.2
Drivetrain
Drive chain: 420 chain
Ignition
Spark plug: NGK CR8E
Plug gap: 0.6 mm
Fluids & Filters
Engine oil: SAE10W-40, API SG
Engine oil (with filter, L): 1.5
Engine oil (without filter, L): 1.45
Oil filter: Hiflofiltro HF131
Brake fluid: DOT 4
Fuel consumption
Estimated range: ~680 km on a full tank (17.0 L)
Service
Service interval (km): 10000
Service interval (months): 12
Valve check (km): 24000
Parts and consumables for this motorcycle
Data is gathered with care, but without guarantee. Always confirm critical information with your dealer or workshop.
Service notes
Service interval: every 10,000 km or 12 months, whichever comes first. Valve clearance check every 24,000 km. Valve clearance — intake 0.10-0.20MM (cold), exhaust 0.20-0.30MM (cold). Engine oil: oil grade SAE10W-40, API SG, 1.5 L with filter change, 1.45 L without filter change. Spark plug: NGK CR8E (gap 0.6 mm). Brake fluid: DOT 4. Chain: chain. Tire pressure: front 2 bar, rear 2.2 bar (cold). Tire size: front 110/70-17, rear 150/70-17. Always confirm critical values with the workshop manual or an authorised dealer.
OEM and quality aftermarket parts that fit this bike. Always confirm with your dealer before ordering.
Engine oil
Spec: SAE10W-40, API SG, 1.5 L (with filter), 1.45 L (without filter)
- OEM OEM recommended engine oil (SAE 10W-40)
- Premium Motul 7100 4T (100% Synthetic, Ester)
Fully Synthetic vs Semi-Synthetic
| Fully Synthetic | Semi-Synthetic | |
|---|---|---|
| Base oil | 100% chemical synthesis (ester or PAO) | Mineral oil + synthetic additives |
| Heat resistance | Excellent — stable at extreme heat & RPM | Good — suitable for normal temperatures |
| Cold start | Better — reaches engine faster when cold | Good — adequate for normal climates |
| Change interval | Longer (up to 10,000 km) | Shorter (5,000–7,000 km typical) |
| Price | Higher | Lower |
Oil filter
Spec: Hiflofiltro HF131
- Premium Hiflofiltro HF131
Spark plug
Spec: NGK CR8E, gap 0.6 mm
- OEM NGK CR8E
- Premium NGK CR8EIX
Front brake pads
Rear brake pads
Front tire
Spec: 110/70-17, 2.0 bar
- OEM OEM 110/70-17
Rear tire
Spec: 150/70-17, 2.2 bar
- OEM OEM 150/70-17
Brake fluid
Spec: DOT 4
Coolant
Service interval
Spec: 10 000 km / 12 months
- OEM Engine oil + oil filter change
- OEM Air filter inspection
- OEM Spark plug check
- OEM Brake fluid replacement: every 2 years
Valve check
Spec: 24 000 km
- OEM Intake clearance: 0.10-0.20MM (cold)
- OEM Exhaust clearance: 0.20-0.30MM (cold)
Suspension
Spec: telescopic fork / 262 ml SAE 10W
- OEM Fork: telescopic fork
- OEM Fork oil grade: 262 ml SAE 10W
Air filter
Drive chain
Battery
- Premium Yuasa YTX5L-BS or YT4B-BS (typical 50-125cc)
