Hyosung GT 650 NAKED (2004–2007) — Specs
Identity
Manufacturer: Hyosung
Model: GT 650 NAKED
Category: Motorcycle
Type: Motorcycle
Years: 2004 → 2007
Engine
Displacement (cc): 647
Cylinders: 2
Power (hp): 77
Power (kW): 57
Torque (Nm): 60
Dimensions
Overall length: 2150 mm
Overall width: 810 mm
Overall height: 1180 mm
Wheelbase: 1450 mm
Ground clearance: 155 mm
Weight (kg): 208
Seat height (mm): 780
Tank (L): 17
Tires
Front tire: 120/70-17
Rear tire: 160/60-17
Front pressure (bar): 2.25
Rear pressure (bar): 2.25
Ignition
Spark plug: NGK CR8E
Plug gap: 0.6 mm
Fluids & Filters
Engine oil: SAE10W-40, API SG
Engine oil (with filter, L): 3.2
Engine oil (without filter, L): 3
Oil filter: Hiflofiltro HF681
Coolant (L): 1.6
Brake fluid: DOT 4
Fuel consumption
Estimated range: ~354 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 cold 0.1-0.2 mm, exhaust cold 0.2-0.3 mm. Engine oil: oil grade SAE10W-40, API SG, 3.2 L with filter change, 3 L without filter change. Spark plug: NGK CR8E (gap 0.6 mm). Brake fluid: DOT 4. Coolant capacity: 1.6 L. Tire pressure: front 2.25 bar, rear 2.25 bar (cold). Tire size: front 120/70-17, rear 160/60-17. 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, 3.2 L (with filter), 3.0 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 HF681
- Premium Hiflofiltro HF681
Spark plug
Spec: NGK CR8E, gap 0.6 mm
- OEM NGK CR8E
- Premium NGK CR8EIX
Front brake pads
Rear brake pads
Front tire
Spec: 120/70-17, 2.25 bar
- OEM OEM 120/70-17
Rear tire
Spec: 160/60-17, 2.25 bar
- OEM OEM 160/60-17
Brake fluid
Spec: DOT 4
Coolant
Spec: 1.60 L coolant capacity
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: cold 0.1-0.2 mm
- OEM Exhaust clearance: cold 0.2-0.3 mm
Suspension
Spec: 41 mm USD fork / 380 ml SAE 10W
- OEM Fork: 41 mm USD fork
- OEM Fork oil grade: 380 ml SAE 10W
Air filter
Drive chain
Battery
- Premium Yuasa YTX12-BS or YTZ10S (typical 500-750cc)
