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TECHNICAL & CONSUMER INFORMATION
ENGINE
HHT25S HHT35S
Model GX25 GX35
Engine type 4-stroke, overhead-cam, single-cylinder
Displacement 1.5 cu in (25.0 cc) 2.2 cu in (35.8 cc)
Bore & stroke 1.4 x 1.0 in (35 x 26 mm) 1.5 x 1.2 in (39 x 30 mm)
Maximum output* 1.1 hp (0.81 kW) at 7,000 rpm 1.6 hp (1.2 kW) at 7,000 rpm
Maximum torque 0.92 ft-lbs (1.25 N•m) at 5,000 rpm 1.4 ft-lbs (1.9 N•m) at 5,500 rpm
Ignition system Transistorized magneto
Spark plug NGK: CMR5H
Starting system Recoil
Fuel Unleaded gasoline (86 octane or higher)
Fuel tank capacity 0.13 US gal, 16.9 fl.oz. (0.50 ) 0.17 US gal, 22.0 fl oz (0.65)
Fuel consumption 0.55 lb/hph (340 g/kWh, 250 g/psh) 0.59 lb/hph (360 g/kWh, 265 g/psh)
Oil capacity 2.7 fl oz (80 cc) 3.4 fl oz (100 cc)
Carburetor type Diaphragm type (overflow return) with fuel pump
Air cleaner Single element, semi-dry
Idle speed 3,100 ± 200 rpm
* Horsepower rating (shown as maximum power output at 7,000 rpm) is in accordance with SAE J1995. Actual engine
power will be lower. Engine power depends on accessories, operating speeds, operating conditions, and other
variables.
FRAME
HHT25S HHT35S
Ignition switch Slide type
Throttle control Two-motion trigger style
Frame
pipe OD 1.0 in (25.4 mm)
Thickness 0.059 in (1.5 mm)
Drive
Type
Material Flexible steel cable
OD 0.25 in (6.3 mm)
Engagement 0.20 in (5 mm) square drive both ends
Bushing Material Nylon
Length 57.5 in (1460 mm)
Gear
case Ratio 1.24 (input shaft) : 1 (output shaft)
Type Ball bearings, helical cut gears, no shims required
Clutch
Size 2.18 in (55.2 mm) 3.09 in (78.4 mm)
Engagement 4,200 ± 200 rpm
Drive Square female
Type Centrifugal