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| Manufacturer | Kymco |
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| Model | 2021 Kymco Mongoose 90S |
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| Type | Youth ATV |
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| Fuel | Gasoline |
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| Transmission | Continuously Variable |
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| Drive | 4X2 |
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| Price | 2549 |
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| Years Made | 2021 |
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| Recommend Min. Age | 10 |
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| Factory | Taiwan |
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| Engine Type | Single-Cylinder |
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| Cooling System | Air cooled |
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| Fuel Type | Gasoline |
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| No of Cylinders | 1 |
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| No of Valves | 2 |
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| Valve Configuration | SOHC |
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| Combustion | Carburetor |
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| No Of Carburetors | 1 |
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| Carburetor Size | 0,6 in (1,5 cm) |
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| Starter | Electric and Kick |
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| Compression Ratio | 10.0:1 |
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| Displacement | 5.5 cu in (90,1 cc) |
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| Engine Stroke | Four Stroke |
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| Stroke | 2 in (5,1 cm) |
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| Bore | 1.9 in (4,8 cm) |
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| Horsepower | 6.4 HP (4,8 kW) |
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| Torque | 4.9 ft-lbs (6,6 Nm) |
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| Torque RPM | 5500 |
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| Fuel Capacity | 1.4 gal (5,3 l) |
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| Fuel Capacity Reserve | 0.4 gal (1,5 l) |
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| Transmission Type | Continuously Variable |
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| Primary Drive (Rear Wheel) | Chain |
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| Primary Drive (Engine and Transmission) | Belt |
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| Reverse | Yes |
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| High-Low Range | No |
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| Driveline Type | 4X2 |
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| No Of Driveline Modes | 1 |
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| Front Brake Type | Drum |
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| Rear Brake Type | Hydraulic Disc |
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| Front Suspension Type | Independent A-Arm |
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| Rear Suspension Type | Swing Arm |
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| Front Central Suspension Strut | No |
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| Steering Type | Manual |
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| Steering Control | Handlebar |
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| Steering Damper | No |
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| Wheels Composition | Steel |
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| Tire Types | Tubeless |
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| Front Tire Diameter | 18 in (45,7 cm) |
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| Rear Tire Diameter | 18 in (45,7 cm) |
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| Front Tire Width | 7 |
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| Front Wheel Diameter | 8 |
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| Rear Tire Width | 9 |
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| Rear Wheel Diameter | 8 |
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| Front Tire | 18 X 7-8 |
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| Rear Tire | 18 X 9-8 |
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| Front Suspension Travel | 2.8 in (7,1 cm) |
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| Rear Suspension Travel | 2.9 in (7,4 cm) |
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| Rear Shock Qty | 1 |
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| Seat Type | One-Piece |
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| Seat Material | Vinyl |
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| Seat Position | Driver |
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| No Of Seats | 1 |
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| Floor Board Location | Driver |
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| Light Type | Halogen |
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| Temperature Warning Type | Light |
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| Frame | Steel |
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| Body Material | Plastic |
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| Length | 57,5 in (146,0 cm) |
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| Width | 35.4 in (89,9 cm) |
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| Height | 36.2 in (91,9 cm) |
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| Wheelbase | 37 in (94,0 cm) |
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| Ground Clearance | 5.9 in (15,0 cm) |
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| Dry Weight | 264.6 lbs (120,0 kg) |
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| Fuel Injector | No |
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| Carburetor | Yes |
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| Rear Unlocking Differential | No |
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| Rear Solid Axle | Yes |
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| Chromed | No |
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| Bash Plate (Front) | Yes |
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| Front Fender | Standard |
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| Rear Fender | Standard |
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| Front Bumper | Standard |
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| Rear Bumper | Standard |
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| Headlight | Standard |
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| Hand Grips | Standard |
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| Kill Switch / Tether Cord | Standard |
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| Metallic | No |
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| Handlebar Pads | Standard |
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