The ATC250R is a high-performance ATV manufactured by Honda from 1981 to 1986. The initial model (1981-1984) used a 248 cc air-cooled, single-cylinder two-stroke engine. The fuel is fed through a 27 mm (1981-1982) or 30 mm (1983-1984) rotary carburetor. Power is accessed via a five-speed transmission at close range with manual clutch. Then the model (1985-1986) used a liquid-cooled two-cylinder engine, 246 cc single cylinder with 34 mm (1985) or flat (1986) shear carburetor. The biggest engine downfall is the lack of power valves. The 85-86 model is enhanced with a close-to-six-speed transmission again with manual clutch.
All year models are fully suspended and adjustable, using auxiliary front fork and rear gas shocks that are rechargeable gas single reservoirs. The 1981-1982 model offers a 6.7 inch front suspension ride and a 4.3 inches rear, 1983-1984 offering 8.7 inches in front and 8.1 inches rear, while 1985-1986 gives 9.8 inches of travel. All year models also use counter-balancer gear-driven to reduce engine vibration. Double disc brakes are used on all year models, with the exception of 1981, which uses front discs and rear drums.
The 1981 1982 ATC250R (1st gen) marks an off-road milestone, as this is the first two-step ATV designed specifically for racing. When ATV racing is still in its early stages, drivers must rely on Honda ATC110 and ATC185 models on the racetrack. Both of these four-stroke models are sluggish and poorly suspended when compared to the 2-step ATC250R.
1983 1984 The ATC250R (2nd gen) incorporated many improvements over the previous 1982 model, especially with the introduction of Pro-Link suspensions, folding leg pegs, larger fuel tanks, slightly longer front and rear travel suspensions, and other improvements.
The 1985 1986 ATC250R (3rd gen Liquid Cooled) is the last generation model offered for sale in the United States, after an agreement between manufacturers and the Consumer Product Safety Commission to stop production on all 3-wheel ATVs. This is the result of thousands of legal battles on security issues and high accident rates.
The 1986 Honda TRX250R Fourtrax is a 4-wheeled brother of the ATC250R, with nearly the same engine (with a horsepower).
Honda also created three other machines of the same size for their HRC racing team, but this is not a production model. These machines are ATC125R, ATC200R, ATC300R, ATC350R, ATC400R, ATC480R, and ATC500R. Of these machines, the most popular ATC200R. Rumor has it that before stopping production, Honda built ATC500R for production.
The Honda ATC250R competition comes mostly from the Kawasaki KXT Tecate 250 and Yamaha Tri-Z 250, and up to a smaller level than companies like Tiger ATV. ATC250R is often compared to the Honda ATC350X, which is a high performance 3-step ATV 3 wheel more suitable for riding recreation than racing.
It is rumored that many collections of ATC250R and 3 other wheels are in the old warehouse in Parma NY, too.
The ATC250R will be updated in 1987 with features like white plastic, redesigned logo, and possibly key ignition. While various parts have recently emerged, the complete ATC250R 1987 has not been found. Various sources indicate that dealers where instructed to remove motors and other parts common to previous models and then cut the frame to half to prevent their sales. In the tricycle community, the search continues for these models.
Video Honda ATC250R
Machine Specifications
Engine type - Air-cooled 1985-1986, 2-stroke, single cylinder Bore & amp; Stroke - 66 x 72 mm Displacement - 248Ã, cc for 1981-1984 or 246Ã, cc for 1985 and 1986
The compression ratio - 8.0 to 1
Lubrication - fuel: oil mixture Air filtration - foam element
Cylinder Bore - 66,020 - 66,040
New York Cleaning of pistons/cylinders - 0.060 - 0.080 Piston Diameter - 65.94 - 65.96 mm Pison pin bore - 18.007 - 18,013 mm Outside diameter of Piston pin - 17,994 - 18,000 mm Piston-to-piston pin clearance - 0.007 - 0.019 mm Piston Ring per Piston Compression - 2
Ring end gap -.20 -.40 mm Side ring cleaning -.045 -.075 mm Connector rod (sm end inner diameter) - 21.997 - 22.009 mm
Maps Honda ATC250R
References
Source of the article : Wikipedia
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