- Johnson Motor Wheel
Johnson Motor Wheel was a kit to convert a bicycle into a motorized bicycle. It was manufactured by an American firm, Johnson Brothers Motor Company in Terre Haute, Indiana.
The Johnson Motor Wheel was designed in 1914 by Louis Johnson. It was patented in the USA in 1919 and in the UK in 1920. The initial design had problems at high speeds, so a fellow inventor from Indiana, Dick Oglesby, offered his magnetos to the Johnsons in order to address the problem. The Johnson brothers moved to South Bend, Indiana and formed the Johnson Brothers Motor Wheel Company to manufacture the kits.
The Motor Wheel had a 2 cycle engine which produced 1HP and had two flywheel magnetos, bronze bearings and a float feed carburetor. The complete kit came with a wheel, hub tire, shock-absorbing spring sprocket holder, wheel sprocket and chain, handlebar controls for choke, throttle and engine shutoff, three quart gas tank and gas line, and all necessary fittings to adapt the engine and rear wheel [read more...]
- Harley-Davidson XR-750
The XR-750 is a Harley-Davidson racing motorcycle made since 1970, primarily for dirt track racing, but also for road racing in the XRTT variant. The XR-750 was designed in response to a 1969 change in AMA Grand National Championship rules that leveled the playing field for makes other than Harley-Davidson, allowing Japanese and British motorcycles to outperform the previously dominant Harley-Davidson KR race bike. The XR-750 went on to become the winningest race bike in the history of American Motorcyclist Association (AMA) racing.
The XR-750 is associated with the careers of racers Mark Brelsford, Cal Rayborn, and Jay Springsteen, and was the favorite motorcycle of stunt performer Evel Knievel. An XR-750 was included in the 1998 The Art of the Motorcycle exhibition, and one of Knievel's bikes is in the Smithsonian's National Museum of American History America on the Move exhibit.
Rule changes obsolete KR racers
XR-750 dirt tracker
At the Barber Vintage Motorsports Museum. [read more...]
- IOE engine
The intake/inlet over exhaust (IOE) engine, also known as F-head and pocket valve, is a valvetrain configuration used in early four-stroke internal combustion engines. The configuration consists of intake valves located in the cylinder head and exhaust valves located in the cylinder or engine block.
In a F-head engine, the intake manifold and its valves are located atop the cylinders, in the cylinder head, and are operated by rocker arms which reverse the motion of the pushrods so that the intake valves open downward into the combustion chamber. The exhaust manifold and its valves are located beside or as part of the cylinders, in the block. The exhaust valves are either roughly or exactly parallel with the pistons; their faces point upwards and they are not operated by pushrods, but by contact with a camshaft through the tappet or valve lifter.
The earliest IOE layouts used atmospheric inlet valves which were held closed with a weak spring and were opened by [read more...]
Pierce-Arrow was an American automobile manufacturer based in Buffalo, New York, which was active from 1901 to 1938. Although best known for its expensive luxury cars, Pierce-Arrow also manufactured commercial trucks, fire trucks, camp trailers, motorcycles, and bicycles.
The forerunner of Pierce-Arrow was established in 1865 as Heinz, Pierce and Munschauer. The company was best known for its household items, especially its delicate gilded birdcages. In 1872, George N. Pierce bought out the other two, switching the name to George N. Pierce Company and, in 1896, bicycles were added to the product range. A failed attempt to build a steam-powered car was made in 1900 under license from Overman but, by 1901 Pierce built its first single-cylinder two-speed, no-reverse Motorette with the engine licensed from de Dion. In 1904, a two-cylinder car, the Arrow was made.
1911 Pierce-Arrow Five-ton Truck
1915 Touring Car, Salt Lake City, Utah [read more...]
Hodaka was a joint Japanese and American company that manufactured motorcycles in the 1960s and 1970s.
The company also went by the name PABATCO, for Pacific Basin Trading Company. Its headquarters were in the rural town of Athena, Oregon. Pabatco was owned by Shell Oil Company from 1965 to 1978. The name Hodaka is rumored to have been borrowed from a mountain near the factory. Opening its doors in 1964, Hodaka is credited by some with starting the trail bike craze in the United States. Hodaka models included the Ace 90, Ace 100, Wombat, Combat Wombat, Super Combat, Super Rat, Dirt Squirt, Road Toad and Thunderdog.
In the late 1970s, a combination of events led to the demise of Hodaka. Falling US dollar exchange rates against the Japanese yen, a shift in demand from dirt bikes to larger road bikes, and general economic weakness fatally wounded the company. Hodaka attempted a purchase of Fuji Heavy Industries —the Japanese company which manufactured most Hodaka engines—but were [read more...]
- Rokon motorcycle
Rokon is a Rochester, New Hampshire-based motorcycle manufacturer that builds unusual 2-wheel-drive off-road motorcycles which are sometimes referred to as Moto-tractors.
Rokon was founded in Vermont by Orla Larsen in 1963 to sell the Nethercutt Trail-Breaker, a 2-wheel-drive motorcycle invented around 1958 by Charlie Fehn and built in Sylmar, California. In 1964 Rokon Inc. bought the manufacturing rights to the Trail-Breaker and marketed the bikes from their Vermont office before moving the business to New Hampshire, where they continue in business today.
Rokon motorcycles use a combination of belt, chain, and shaft drives coupled to gear boxes to drive both the front and rear wheels. Older machines were powered by a West Bend (US Motor/Chrysler Marine) 820 2-stroke engine (134cc), while newer machines have either a Honda or Kohler engine of about 6hp. The wheels are able to hold gasoline or water for long distance trips.
These are slow-speed off-road motorcycles [read more...]