BETA Ark AC | BMW R 12 |
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engine specs | |
Type | |
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Single-cylinder, 2-stroke, air cooled | Water-cooled, 2-cylinder, four-stroke boxer engine with four valves per cylinder operated by cam followers and two overhead camshafts per cylinder |
Displacement | |
49 cm3 | 1170 cm3 |
Bore X Stroke | |
1.6x1.5 in OR 41 mm | 4.0x2.9 in OR 102 mm |
Compression Ratio | |
12:1 | - |
Horsepower | |
- | 95/6500 KW(hp)/RPM |
Torque | |
- | 81/6000 lb-ft/RPM OR 110/6000 Nm/RPM |
Fuel System | |
DellOrto PHVA 12 HS carburetor | - |
transmission specs | |
Gearbox | |
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CVT, automatic | 6-speed |
Clutch | |
dry centrifugal, automatic | - |
Primary Drive | |
gears | - |
Final Drive | |
V belt drive | Shaft |
chassis specs | |
Frame | |
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tubular steel | Tubular space frame in steel, engine self-supporting |
Front Suspension | |
hydraulic fork with 32mm shaft | USD telescopic forks, 45 mm |
Rear Suspension | |
monoshock with adjustable spring preload | Aluminium Paralever swinging arm, directly linked WAD spring strut, spring base and rebound damping adjustable |
Front Brake | |
190mm disc | Twin disc brake, floating brake discs, 310 mm, 4-piston monobloc fixed calipers |
Rear Brake | |
110.5mm drum | Single disc brake, 265 mm, 2-piston floating caliper |
dimension specs | |
Overall Length | |
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68.5 in OR 1740 mm | 86.6 in OR 2200 mm |
Overall Width | |
29.5 in OR 749 mm | 32.7 in OR 831 mm |
Seat Height | |
32.7 in OR 831 mm | 29.7 in OR 754 mm |
Ground Clearance | |
8.5 in OR 216 mm | - |
Weight | |
185 lbs OR 84 kg | 500 lbs OR 227 kg |
Fuel Capacity | |
2 gallons OR 7.6 L | 3.7 gallons OR 14.0 L |
Wheelbase | |
48.8 in OR 1240 mm | 59.8 in OR 1519 mm |
tyres specs | |
Front | |
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120/70 - 13 | 100/90-19 |
Rear | |
130/60 - 13 | 150/80-16 |