Montesa Cota 4RT

ENGINE

Type Liquid-cooled 4-stroke 4-valve SOHC single

Displacement 258,9 cm3

Bore × Stroke 78 _ 54.2 mm

Compression Ratio 10.5 : 1

Idling Speed 1,800 min-1

Engine Oil Capacity 0.6 litres

Transmission Oil Capacity 0.57 litres

 

FUEL SYSTEM

Injection PGM-FI electronic fuel injection

Throttle Bore 28 mm

Air cleaner Foam

Fuel Tank Capacity 1.9 litres

 

ELECTRICAL SYSTEM

Ignition System Computer-controlled digital transistorised with electronic advance

Ignition Timing 27° BTDC (idle) ~ 45° BTDC (10,000 min-1)

Sparkplug Type CR6EH-9 (NGK)

Starter Primary kick

ACG Output 160 W

 

DRIVE TRAIN

Clutch Multiplate with coil springs

Clutch Operation Hydraulic

Transmission Type 5-speed

Primary Reduction 3.166 (57/18)

Gear Ratios :

1 2.800 (42/15)

2 2.384 (31/13)

3 2.000 (30/15)

4 1.272 (28/22)

5 0.814 (22/27)

Final Reduction 4.100 (41/10)

Final Drive # 520 roller chain

 

FRAME

Type Diamond; aluminium twin-spar

 

CHASSIS DIMENSIONS

Dimensions (L×W×H) 2,016 _ 830 _ 1,130 mm

Wheelbase 1,321 mm

Caster Angle 23°

Trail 63 mm

Turning Radius 2.5m

Seat Height 650 mm

Footrest Height 390 mm

Ground Clearance 335 mm

Dry Weight 73 kg

 

SUSPENSION

Front 39 mm TECH cartridge-type telescopic fork with preload and extension adjustments. 175 mm axle travel

Rear Pro-Link with single R13V damper, Preload and rebound damping adjustment; 170 mm axle travel

 

WHEELS

Front 21 _ 1.60

Rear 18 _ MT2.15

Front Tyre 2.75–21 (Pressure: 39 – 44kPa)

Rear Tyre 4.00–18 (Pressure: 29 – 34kPa)

 

BRAKES

Front 185 × 3.5 mm hydraulic disc with four-piston calliper and sintered metal pads

Rear 150 × 2.5 mm hydraulic disc with double-piston calliper and sintered metal pads