Classic Bikes Custom Bikes Individual Racing Bikes AJP AJS Aprilia Ariel Avinton / Wakan Bajaj Benelli Beta Bimota BMW Brough Superior BRP Cam-Am BSA Buell / EBR Bultaco Cagiva Campagna CCM CF Moto Combat Motors Derbi Deus Ducati Excelsior GASGAS Ghezzi Brian Gilera GIMA Harley Davidson Hero Highland Honda Horex Husaberg Husqvarna Hyosung Indian Jawa Kawasaki KTM KYMCO Laverda Lazareth Magni Maico Mash Matchless Mondial Moto Guzzi Moto Morini MV Agusta MZ / MuZ NCR Norton NSU Paton Peugeot Piaggio Revival Cycles Roland Sands Royal Enfield Sachs Sherco Sunbeam Suzuki SWM SYM Triumph TVS Ural Velocette Vespa Victory Vincent VOR Voxan Vyrus Walt Siegl Walz Wrenchmonkees Wunderlich XTR / Radical Yamaha Zero Video Technical
Complete Manufacturer List

Honda NSF 250R Moto 3

Make Model	Honda NSF250R Moto3 MR03
Year	2012
Engine	Liquid-cooled, four stroke, single cylinder, DOHC
Capacity	249.3
Bore x Stroke	78.0 × 52.2 mm
Compression Ratio
Fuel supply system	PGM-FI
Ignition	Full-transistor
Oil Capacity (ENG OIL/T.M OIL)	1.27 Litres / 0.55 Litres
Clutch	Wet multiplate
Lubricating type	Semi-Dry Sump
Max Power	35.5 kW @ 13000 rpm
Max Torque	28 NM @ 10500 rpm
Transmission / Drive	6 Speed / chain Constant mesh
Gear Ratio	1st 1.875 2nd 1.524 3rd 1.304 4th 1.167 5th 1.077 6th 1.000
Reduction gear ratio	Primary 2.952 / Secondary 2.333
Frame	Aluminum twin tube
Front Suspension	Inverted　telescopic
Rear Suspension	Pro-link suspension system
Front Brakes	Single 296mm Hydraulic disc
Rear Brakes	Single 186mm Hydraulic disc
Front Tyre	90/580R17
Rear Tyre	120/600R17
Caster Angle	22°36″ degree
Dimensions	Length 1809 mm Width 560 mm Hieght 1037mm
Wheelbase	1.219 mmm
Wet Weight	84 kg
Seat Height	729 mm
Ground clearance	107 mm
Fuel Capacity	11 Litres

A press kit issued by Honda said: "The NSF250 engine was developed exclusively for road racing, to ensure superior quality and greater potential for commercial racing machine. With a development concept of "lightweight, compact, high output and efficiency," numerous technological advances were introduced to create an engine befitting a racing machine.

"The DOHC single-cylinder 249cc engine demonstrates a racing machine's power delivery and response, with intake from front and exhaust to rear to improve air charging efficiency, and a cylinder tilted back 15 degrees to concentrate the engine’s mass, primarily to improve its stability. In order to deliver ample power into the high rpm range, the DOHC system incorporates titanium valves for both intake and exhaust (Honda patented).

"The new design also offers improved air charging efficiency along with ram-air intake, thanks to the straight intake port and throttle body with 50-mm diameter bore. In shaft layout, the balancer shaft is placed above the crankshaft to make the engine shorter and concentrate the mass."

Explaining details of the chassis concept, Honda said it was heavily based on the RS125R chassis.

"The NSF250R’s frame is based on the RS125R’s proven unit. To optimise the rigidity in balance and torsion of a 4-stroke engine, frame specifications were determined from actual riding tests and CAE analysis. For the front engine hanger and the main pipe section, optimum balance was achieved mainly by enhancing torsional rigidity.

"A newly configured swing-arm and frame body also resulted in a structure allowing smooth torsional characteristics. On the whole, stability during braking is improved, and a leeway and nimbleness during cornering exceeding those of the RS125R is ensured. The frame offers superb handling so that riders will not feel the weight increase of a 4-stroke engine, even when approaching corners."