Yamaha Dirt Bikes And Their History: Specs On The 2012 Range The history of Yamaha dirt bikes began way back before your old man was just a twinkle in his ol' mans eye. The Yamaha Corporation was founded in 1887 by Torakusu Yamaha. They originally built pianos, then over the years branched out into a wide range of products including all types of electronics, musical instruments, computer products, home appliances and even robotics. To this day you can still recognize Yamaha's strong musical roots by it's logo which consists of 3 interlocking tuning forks.It was Genichi Kawakami, the current CEO of the Yamaha Corporation, who made the decision to utilize the companies engineering skills and expand into motorized devices.
As you can see, the Yamaha dirt bikes of today have changed just a tad since the Flintstones-styled DT-1! Some 2012 Yamaha Dirt Bike Models
This year sees the WR450f with a new fuel injection system, upgraded forks and chassis, and a slimmer body. Throw in a new headlight and some new graphics and you have a sharp looking trail blazer!
SPECS: Model: WR450F - 2012 Engine: 449cc liquid-cooled DOHC 4-stroke; 5 titanium valves Bore Stroke: 95.0mm x 63.4mm Compression Ratio: TBA Fuel Delivery: Fuel Injection Ignition: CDI Transmission: Constant-mesh 5-speed; multiplate wet clutch Final Drive: Chain Drive Chassis: Suspension/Front: Inverted fork; fully adjustable Suspension/Rear: Single shock; fully adjustable, 12-in travel Brakes/Front: Hydraulic single disc brake Brakes/Rear: Hydraulic single disc brake Tires/Front: TBA Tires/Rear: TBA Dimensions: Length: TBA Width: TBA Height: TBA Seat Height: TBA Wheelbase: TBA Ground Clearance: TBA Wet Weight: TBA Fuel Capacity: 2.1 gal Warranty: 30 Day (Limited Factory Warranty) Modified fuel injection settings, a different muffler, and tweaked suspension settings claim to make the 2012 YZ450f a better machine than it's older twin.
SPECS: Model: YZ450F - 2012 Engine: 449cc liquid-cooled DOHC 4-stroke; 4 titanium valves Bore Stroke: 97.0 x 60.8mm Compression Ratio: 12.5:1 Fuel Delivery: Yamaha Fuel Injection (YFI), Keihin 44mm Ignition: TCI Transmission: Constant-mesh 5-speed; multiplate wet clutch Final Drive: Chain Drive Suspension/Front: KYB Speed-Sensitive System, inverted fork: fully adjustable, 12.2-in travel Suspension/Rear: KYB Fully adjustable single shock; 12.4-in travel Brakes/Front: Hydraulic single disc brake, 250mm Brakes/Rear: Hydraulic single disc brake, 245mm Tires/Front: 80/100-21 Dunlop Geomax MX51 Tires/Rear: 120/80-19 Dunlop Geomax MX51 Dimensions: Length: 86.4 in Width: 32.5 in Height: 51.6 in Seat Height: 39.4 in Wheelbase: 58.7 in Ground Clearance: 15.2 in Wet Weight: 245 lb Fuel Capacity: 1.6 gal Warranty: 30 Day (Limited Factory Warranty) It looks like the team at Yamaha have been working overtime for the 2012 YZ250f! They've added a larger carby, lighter piston and improved the engine's breathing to help it hum in the mid to high speed range. The frame, fork tubes and swingarm axle blocks, amongst other things, have been altered to accommodate the engine improvements and improve chassis stability.
SPECS: Model: YZ250F - 2012 Engine: 250cc liquid-cooled DOHC 4-stroke; 5 titanium valves Bore Stroke: 77.0mm x 53.6mm Compression Ratio: 13.5:1 Fuel Delivery: Keihin FCR MX39 Ignition: CDI Transmission: Constant-mesh 5-speed; multiplate wet clutch Final Drive: Chain Drive Chassis: Suspension/Front: KYB Speed-Sensitive System inverted fork; fully adjustable, 11.8-in travel Suspension/Rear: KYB Fully adjustable single shock; 12.5-in travel Brakes/Front: Hydraulic single disc brake, 250mm Brakes/Rear: Hydraulic single disc brake, 245mm Tires/Front: 80/100-21 Tires/Rear: 110/90-19 Dimensions: Length: 85.4 in Width: 32.5 in Height: 51.4 in Seat Height: 39 in Wheelbase: 58.1 in Ground Clearance: 14.9 in Wet Weight: 227 lb Fuel Capacity: 1.6 gal Warranty: 30 Day (Limited Factory Warranty)
SPECS: Model: YZ250 - 2012 Engine: 249cc liquid-cooled 2-stroke; reed-valve inducted Bore Stroke: 66.4 x 72.0mm Compression Ratio: 8.9 – 10.6:1 Carburetion: Keihin PWK38S Ignition: CDI Transmission: Constant-mesh 5-speed; multiplate wet clutch Final Drive: Chain Drive Chassis: Suspension/Front: Speed-Sensitive System inverted fork; fully adjustable, 11.8-in travel Suspension/Rear: Fully adjustable single shock, 12.4-in travel Brakes/Front: Hydraulic single disc brake, 250mm Brakes/Rear: Hydraulic single disc brake, 245mm Tires/Front: 80/100-21-51M Tires/Rear: 110/90-19-62M Dimensions: Length: 85.7 in Width: 32.6 in Height: 51.4 in Seat Height: 39.1 in Wheelbase: 58.3 in Ground Clearance: 15.0 in Wet Weight: 227 lb Fuel Capacity: 2.1 gal Warranty: 30 Day (Limited Factory Warranty)
SPECS: Model: YZ125 - 2012 Engine: 124cc, liquid-cooled, 2-stroke, reed-valve inducted Bore Stroke: 54.0 x 54.5mm Compression Ratio: 8.6-10.7:1 Fuel Delivery: Mikuni TMX 38 Ignition: CDI Transmission: Constant-mesh 6-speed; multiplate wet clutch Final Drive: Chain Drive Chassis: Suspension/Front: Speed-sensitive system inverted fork; fully adjustable, 11.8-in travel Suspension/Rear: Fully adjustable single shock; 12.4-in travel Brakes/Front: Hydraulic single disc brake, 250mm Brakes/Rear: Hydraulic single disc brake, 245mm Tires/Front: 80/100-21 51M Tires/Rear: 100/90-19-57M Dimensions: Length: 84.1 in Width: 32.6 in Height: 51.8 in Seat Height: 39.3 in Wheelbase: 56.8 in Ground Clearance: 15.2 in Wet Weight: 208 lb Fuel Capacity: 2.1 gal Warranty: 30 Day (Limited Factory Warranty) KIDS 2012 YAMAHA DIRT BIKE
SPECS: Model: YZ85 - 2012 Engine: 85cc liquid-cooled 2-stroke; reed-valve inducted Bore Stroke: 47.5 x 47.8mm Compression Ratio: 8.2:1 Carburetion: Keihin PWK28 Ignition: CDI Transmission: Constant-mesh 6-speed; multiplate wet clutch Final Drive: Chain Drive Chassis: Suspension/Front: Inverted fork; fully adjustable, 10.8-in travel Suspension/Rear: Single shock; fully adjustable, 11.1-in travel Brakes/Front: Hydraulic single disc brake, 220mm Brakes/Rear: Hydraulic single disc brake, 190mm Tires/Front: 70/100-17-40M Tires/Rear: 90/100-14-49M Dimensions: Length: 71.7 in Width: 29.8 in Height: 45.7 in Seat Height: 34 in Wheelbase: 49.5 in Ground Clearance: 13.8 in Wet Weight: 156 lb Fuel Capacity: 1.3 gal Warranty: 30 Day (Limited Factory Warranty) If you are interested in the full range of Yamaha Dirt Bikes then check out www.yamaha-motor.com What Do You Think About Yamaha Dirt Bikes?
Have you ever owned a Yamaha? Maybe a vintage Yamaha? Tell us what you think of the four stroke range. Do you know of any design faults or problems with particular models? Maybe you have a mechanical tip to share...
|
By August 1954 the Yamaha YA-1 was complete. It was a two-stroke 125cc road bike. July 1955 Yamaha Motor Co L.t.d was founded. It now had its very own dedicated factory called the Hamakita Factory of Nippon Gakki. But it wasn't until 1968 that the first Yamaha dirt bike was produced. The DT-1 was a two-stroke 250cc Enduro bike and was claimed to be the worlds first true off-road motorcycle. It was an exciting and hugely successful bike... and the USA couldn't get enough of 'em!
Grab yourself a copy of The Dirt Bike Garage Manual. A "how to" book and a must-have for developing riders.
Subscribe to Monthly Dirt below for a free Screensaver and lighten up your day once a month!