Suzuki Choinori

Suzuki Choinori
Manufacturer	Suzuki
Production	February 2003 – August 2007
Assembly	Japan; Taiwan
Class	Scooter/moped
Engine	49 cc (3.0 cu in) OHV single-cylinder
Bore / stroke	36.0 mm × 48.6 mm (1.42 in × 1.91 in)
Power	1.5 kW (2.0 hp) @ 5500 rpm
Torque	2.9 N⋅m (2.1 ft⋅lbf) @ 3500 rpm
Ignition type	CDI
Transmission	CVT
Frame type	Tubular steel step-through
Suspension	Front: Telescopic fork; Rear: N/A
Brakes	Front: Drum; Rear: Drum
Tires	Front: 80/90–10 34J; Rear: 80/90–10 34J
Rake, trail	25°, 71 mm (2.8 in)
Wheelbase	1,055 mm (41.5 in)
Dimensions	L: 1,500 mm (59 in); W: 620 mm (24 in); H: 975 mm (38.4 in);
Weight	39 kg (86 lb) (dry); 43 kg (95 lb) (wet)
Fuel capacity	3 L (0.79 U.S. gal; 0.66 imp gal)
Fuel consumption	76 km/L (179 mpg‑US; 215 mpg‑imp)

The Suzuki Choinori was a scooter built by Suzuki from 2003 to 2007. It was designed to minimize the use of materials in general and plastics and threaded fasteners in particular in order to minimize cost. The Society of Automotive Engineers of Japan (in Japanese) named the Choinori as one of the 240 Landmarks of Japanese Automotive Technology.[1]

Concept and design

The Choinori was designed to be a short distance scooter for commuting and running errands.[1] The name "choinori" is derived from "tohnori" the Japanese term for a long-distance touring motorcycle. "Toh nori" means "long ride", "choi nori" is the opposite, meaning "short ride", or "short hop".[2]

The Choinori was designed to minimize the use of materials, especially plastic parts and nuts and bolts. A new 49 cc pushrod OHV engine was designed for the Choinori. The aluminium engine had a linerless bore that was plated by a newly developed high-speed plating process, reducing both cost and weight.[1][2] Another feature to reduce cost and weight was the lack of a rear suspension, with the rear axle being bolted directly to the frame. The minimalist design allowed the Choinori to be sold at an extremely low price,[1] with the basic version advertised at a lower price than Suzuki's contemporary electric bicycle.

Developments and end of production

The Choinori engine was found to have a design problem with the cam followers, this was solved by redesigning the cam followers.^[a]

In 2004, the Choinori SS was introduced. Mechanically the same as the regular Choinori, the SS had the leg shield replaced by a headstock cover, a different style of handlebar was used, and the turn signals were moved to the handlebars.

Production of the Choinori was moved from Japan to Taiwan in 2005, and was discontinued in 2007 when the engine could not meet new emission standards.

References

"Suzuki Choinori". 240 Landmarks of Japanese Automotive Technology. Society of Automotive Engineers of Japan, Inc. Retrieved 12 September 2013. The Suzuki Choinori was developed to be mainly used for short journeys for commuting and shopping. The appropriate engine output, body structure, and required functions were reviewed from the basic design phase in pursuit of mass reduction, rationalization of parts, and high quality. It achieved mass reduction of about 40% compared with a conventional scooter by reducing the size of parts, the application of a new engine, a newly designed frame, and by careful reduction of the number of plastic parts. Such rationalization, including a reduction in the number of parts tightened by nuts and bolts, enabled the Choinori to be sold at the low price of 59,800 yen. Colored resin was used for plastic parts to provide 6 body colors without the need for painting. A new high-speed cylinder plating technology was introduced for the newly developed 4-stroke engine to enable high-speed processing at low cost. This reduced the weight of the engine by about 40% compared with a conventional 50 cc engine.
Yamaguchi, Jack (July 2003), Jost, Kevin (ed.), "Suzuki builds pint-size Twins" (PDF), Automotive Engineering International, University of Michigan: Society of Automotive Engineers, 111: 14–16, retrieved 2011-01-26, The plating fluid (nickel, phosphorus, and silicone carbide) is force-fed into the cylinder bore at high speed, which is five times faster than conventional submergence, according to Suzuki.

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[JSAEChoinori-1] "Suzuki Choinori". 240 Landmarks of Japanese Automotive Technology. Society of Automotive Engineers of Japan, Inc. Retrieved 12 September 2013. The Suzuki Choinori was developed to be mainly used for short journeys for commuting and shopping. The appropriate engine output, body structure, and required functions were reviewed from the basic design phase in pursuit of mass reduction, rationalization of parts, and high quality. It achieved mass reduction of about 40% compared with a conventional scooter by reducing the size of parts, the application of a new engine, a newly designed frame, and by careful reduction of the number of plastic parts. Such rationalization, including a reduction in the number of parts tightened by nuts and bolts, enabled the Choinori to be sold at the low price of 59,800 yen. Colored resin was used for plastic parts to provide 6 body colors without the need for painting. A new high-speed cylinder plating technology was introduced for the newly developed 4-stroke engine to enable high-speed processing at low cost. This reduced the weight of the engine by about 40% compared with a conventional 50 cc engine.

[SAEGlobal082003-2] Yamaguchi, Jack (July 2003), Jost, Kevin (ed.), "Suzuki builds pint-size Twins" (PDF), Automotive Engineering International, University of Michigan: Society of Automotive Engineers, 111: 14–16, retrieved 2011-01-26, The plating fluid (nickel, phosphorus, and silicone carbide) is force-fed into the cylinder bore at high speed, which is five times faster than conventional submergence, according to Suzuki.

[a]