Overhead camshaft | Grease n Gasoline

YBR 125 – electric start, air cooled 4-stroke SOHC engine which provides a feeling of solidity & robustness and satisfactory mileage.

Engine type Air-cooled, 4-stroke, SOHC
Displacement 123 cc
Bore & Stroke 54.0 × 54.0 mm
Compression ratio 10.0:1
Maximum power 10.88PS@7,500 rpm

Maximum torque 10.40N.m / 6,500 rpm

Starting system Electric Start
Lubrication wet sump
Cylinder layout Forward inclined Single cylinder
Clutch type Wet, multiple disc
Ignition system DC CDI
With Oil and Fuel 126kg
Fuel Supply Carburettor
Primary/Secondary reduction ratio 3.400/3.214
Transmission Type Constant mesh 4-speed
Gear ratios 1st=3.000, 2nd＝1.687, 3rd:=1.200, 4th=0.875
Caster/Trail 26.4 degree/90 mm

Frame type Diamond
Battery 12 V, 5.0 Ah
Headlight 12 V, 35W/35 W x 1
Suspension(Front/Rear) Telescopic/Swing arm
Brake Type(Front/Rear) Drum/Drum
Tyre size(Front/Rear) 2.75-18″ 4PR/3.00-18 6PR
Seat Height 795mm

Overall length x width x height 2,065mm x 730mm × 1,100mm
Wheelbase 1300mm
Minimum ground clearance 180mm
Engine oil volume 1.1 liters
Fuel tank capacity 13.6 liters

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History
John Reed, an English designer who lived in California was contracted by Yamaha to design the ultimate custom bike. He designed a muscle cruiser based on the Venture engine.

Upon its release in 1985, the V-Max garnered instant critical acclaim and earned the title “Bike of the Year” from Cycle Guide.Sold both in Japan and abroad, the V-Max has been on the market with only minor modifications since the 1985 model year. The V-Max was noted for its quick acceleration, but was also criticized for its poor cornering ability and soft suspension
Valves and cylinder inside a cutaway VUntil 2008, the original V-Max was offered for sale through the Star Motorcycles division of Yamaha Motorcycles. Apart from a minor freshening to the bike’s specifications in 1993, when the bike gained a larger-diameter fork to minimize high-speed wobbling and drift, four-piston brake calipers, and other handling and safety related upgrades, the 2008 V-Max was almost the same as the original 1985 versionSpecifications

Overall, the V-Max was 2,300 mm (91 in) long, 795 mm (31.3 in) wide, and 1,160 mm (46 in) high. The engine was a tuned version of the double overhead camshaft, four valve per cylinder, liquid-cooled V-4 from the Yamaha Venture. Along with other modifications to the engine, the compression ratio was raised to 10.5:1, and the V-Boost system was added.

V-Boost

V-Boost is a system that opens butterfly valves in the intake manifold between the 1st and 2nd and between the 3rd and 4th cylinders starting from 5,750 rpm. The valves are opened gradually to match the rising rotational speed signal provided by the ignition system. The valves are at the full open position at 8,000 rpm. There is a small black box that reads the rotational speed and sends a computed signal to a servo motor. The servo pulls a wire to open the butterfly valves. The V-Boost System adds 10 percent to the top power rating of the base engine

VMAX

Yamaha VMAX
Manufacturer Yamaha Motor Company
Production since 2009
Predecessor Yamaha V-Max
Class power cruiser
Engine 1,679 cc (102 cu in) liquid-cooled DOHC V-4
Power 174.3 hp (130.0 kW) @ 9,000 rpm[1][9]
Torque 113 ft·lbf (153 N·m) @ 6,600 rpm[9]
Transmission 5-speed, slipper clutch
Frame type cast aluminum
Suspension adjustable front and rear
Brakes Front: radial mount 6-piston calipers, dual wave-type 12.6 inch (320 mm) discs, brembo master cylinder
Rear: single piston caliper, wave-type 11.7 inch (298 mm) disc, Brembo master cylinder
Wheelbase 66.9 in (1,699 mm)
Dimensions L 94.3 in (2,395 mm)
W 32.3 in (820 mm)

Seat height 30.5 in (775 mm)
Weight n/a (dry)
694 lb (315 kg)
Fuel capacity 4.0 US gallons (15 l; 3.3 imp gal)
Fuel consumption 28.3 mpg-US (8.31 L/100 km; 34.0 mpg-imp)

In 2005, at the 39th Tokyo Motor Show, Yamaha displayed an all-new V-Max concept bike. It featured a new chassis, upgraded components all around, and state-of-the-art braking components

On 4 June 2008, Yamaha officially released a completely redesigned 2009 VMAX in North America and Europe. The features of the VMAX include an all aluminium frame with its 1,679 cc (102 cu in) liquid cooled V4 DOHC engine used as a stressed member of the chassis, an electroluminescent instrument readout, Yamaha Chip Controlled Intake (YCC-I), fully adjustable suspension, anti-lock brakes, slipper clutch, a fuel tank beneath the seat, and a distinctive key.

On 20 September 2009, VMAX was also launched in India.
YCC-I/YCC-T

Instead of the V-Boost on the original carburated V-Max, the fuel injected VMAX uses YCC-I and YCC-T. Yamaha Chip Controlled Intake (YCC-I) is a new addition to the VMAX. The airhorns inside the airbox are lifted by a servo activated at 6,650 rpm to open up the airway underneath. This shortens the length of the intake system from 150 mm to 52 mm. This system had its first appearance in the Yamaha stable with the 2006 YZF-R1. The MV Agusta F4 Tamburini was the first bike with such a system. Massimo Tamburini invented this idea. It is called Torque Shift System (TSS) on the Agustas.

Yamaha Chip Controlled Throttle (YCC-T) is also a new addition. The throttle cables are connected to a throttle position sensor and a new computer called G.E.N.I.C.H. that operates the butterfly valves, the EXUP valve in the exhaust and the other components involved, such as the igniter unit, and the YCC-I lifter unit. The YCC-T computes all the input of the sensors and calculates the best throttle position, ignition advance, EXUP valve and injection time in milliseconds.