Honda CB 250
CB 250 is the name of a series of motorcycle models from the Japanese manufacturer Honda . The middle class two-cylinder was produced in many variants. The CB 250 (Tipcode 286) was launched in the USA in the summer of 1968 as the successor to the CB 72 . the last version of which was already called the CB 250. It was a completely new design; both chassis and engine were new.
variants
In contrast to the CB 72, the cylinders were vertical, the primary drive was switched from chain to gearwheels, the gearbox got five gears, instead of slide carburetors there were two throttle valve carburetors with vacuum dome and the rear wheel chain moved to the left side. The frame became a closed double loop tube frame with a pressed steel steering head and upper pull. Originally without any further name, the machine was called K0 after the appearance of the facelifted versions K1-K4 (type code 310/321/348). All street models had horizontal mufflers. The output was initially 26 hp and was increased to 30 hp in 1971. In 1973 the last version with 30 HP and as model K4 B4 (type code 349) with front disc brake and rubber bellows on the telescopic fork instead of the immersion sleeves of the previous models came onto the market. As the K4 (type code 348) with the original front duplex brake and immersion sleeves on the telescopic fork, it was hardly in demand anymore, but it was available.
Mainly for the US market there was a version trimmed for easy terrain, which was built as the CL 250 Scrambler with mufflers raised on the left side, wider handlebars and a smaller tank. There was also this model series with 325 cm³ as CB 350 / CL 350 (bore 64 mm compared to 56 mm for 250 cm³). Very popular outside Germany because it was traveling with 36 HP, the large engine was not very common in Germany because of the insurance classes (limit was 250 cm³, the next limit was 475 cm³, which is why the CB 450 was more attractive). The SL 350 can be seen as a special case in this series ; the K-motor is suspended in a lightweight double-tube frame specially designed for off-road use.
In the successor model, the Honda CB 250 G (type code 367), many of the weaknesses of the K models have been eliminated and, at the same time, significantly changed in appearance. The engine got a crankshaft with deep groove ball bearings instead of the sensitive roller bearings, the camshaft, which used to be problematic in the past, was finally stable thanks to a fourfold slide bearing in the now split cylinder head. The frame and engine were modified so that the cylinder head could be removed with the engine installed. The transmission got six gears, like the CB 400 Four. The tank got longer and slimmer and the angled mufflers ended above the rear axle. The bench became longer and lockable and foldable to the side. The more powerful sister, the CB 360 G, had 34 hp instead of the 27 to 30 hp of the CB 250 G. The G series was never offered as an off-road model. The off-road models were now single-cylinder with the name XL, partly also SL.
The last model of this type of engine was the CJ 250 T from 1976, trimmed down by missing a starter and a 2-in-1 exhaust system and again only with a 5-speed gearbox. A more modern line was presented here with another tank with a screw cap under a small flap and another bench with a rump. The front fender as well as the rear wheel cover have been changed. Especially with the solo exhaust similar to the MZ, the design looked a bit stilted. The engine was basically the G engine and also available with a 67 mm bore as the CJ 360 T (type code 388).
Model overview
Technical specifications | CB 250 Super Sport (CB 72) | CB 250 K0 | CB 250 K1-K3 | CB 250 K4 / disc | CB 250 G |
engine | 2 cylinders, four-stroke OHC (light metal), 2 Keihin horizontal throttle valve carburettors | ||||
Displacement | 247.8 cm³ | 249 cc | 249 cc | 249 cc | 249 cc |
compression | 9.5: 1 | 9.5: 1 | 9.5: 1 | 9.5: 1 | 9.5: 1 |
Power ( hp ) | 22 at 8,200 min -1 | 26 at 10,150 min -1 | 30 at 10,500 min -1 | 30 at 10,500 min -1 | 27 at 9.500 min -1 |
transmission | 4-speed, foot switch | 5-speed, foot switch | 5-speed, foot switch | 5-speed, foot switch | 6-speed, foot switch |
Brakes | front drum brake , rear drum brake | front disc brake , rear drum brake | |||
frame | Backbone tubular frame with motor supporting --- tubular frame with double girder | ||||
Front suspension | oil-dampened shock absorber , coil spring | ||||
Rear suspension | gas pressure damped shock absorber , coil spring | ||||
Length × width × height (mm) | 2025 × 615 × 950 | 2040 × 745 × 950 | 2090 × 775 × 1075 | 2040 × 765 × 1070 | 2085 × 760 × 1070 |
wheelbase | 1295 mm | approx. 1295 mm | 1280/1320 mm | 1320 mm | 1345 mm |
Standard tires | front 2.75–18, rear 3.00–18 | front 3.00–18, rear 3.25–18 | front 3.00–18, rear 3.25–18 | front 3.00–18, rear 3.25–18 | front 3.00–18, rear 3.50–18 |
Empty weight | 153 kg | approx. 160 kg | 160 kg | 170 kg | 175 kg |
Ground clearance | 140 mm | 130 mm | 150 mm | 150 mm | 160 mm |
Top speed | approx. 130 km / h | 145 km / h | 150 km / h | 150 km / h | 142 km / h |
Tank capacity | 14 liters | 14 liters | 12/10 liters | 12 liters | 11 liters |
Production time | 1967-1968 | 1968-1970 | 1970-1972 | 1972-1974 | 1974-1977 |
Technical specifications | CJ 250 T | CB 250 T | CB (X) 250 RS | CB 250 N | CB Two Fifty |
engine | 2 cylinders, four-stroke OHC (light metal), 2 Keihin horizontal throttle valve carburettors | 1 cylinder, four-stroke OHC (light metal), 1 Keihin horizontal throttle valve carburetor | 2 cylinders, four-stroke OHC (light metal), 2 Keihin horizontal throttle valve carburettors | 2 cylinders, four-stroke OHC (light metal), 1 Keihin horizontal throttle valve carburetor | |
Displacement | 249 cc | 249 cc | 245 cc | 245 cc | 234 cc |
compression | 9.5: 1 | 9.5: 1 | 9.5: 1 | 9.5: 1 | 9.2: 1 |
Power ( hp ) | 27 at 9.500 min -1 | 27 at 10,000 min -1 | 27 at 10,000 min −1 / 17 at 7,000 min −1 | 17 at 8,500 min -1 | 17 at 8000 min -1 |
transmission | 5-speed, foot switch | 5-speed, foot switch | 5-speed, foot switch | 6-speed, foot switch | 5-speed, foot switch |
Brakes | front disc brake , rear drum brake | ||||
frame | Tubular frame | ||||
Front suspension | oil-dampened shock absorber , coil spring | ||||
Rear suspension | gas pressure damped shock absorber , coil spring | ||||
Length × width × height (mm) | 2145 × 700 × 1080 | 2040 × 785 × 1125 | 2070 × 730 × 1060 | 2115 × 730 × 1105 | 2150 × 755 × 1090 |
wheelbase | 1295 mm | 1335 mm | 1350 mm | 1395 mm | 1425 mm |
Standard tires | front 3.00–18, rear 3.75–18 | front 3.00–18, rear 3.25–18 | front 3.00–18, rear 4.10–18 | front 3.60–19, rear 4.10–18 | front 90 / 100–18, rear 120 / 90–16 |
Empty weight | 174 kg | 172 kg | 134 kg | 180 kg | 132 kg |
Ground clearance | 140 mm | 160 mm | 160 mm | 165 mm | 166 mm |
Top speed | 148 km / h | approx. 150 km / h | approx. 145 km / h | approx. 130 km / h | 142 km / h |
Production time | 1976-1988 | 1978-1979 | 1981-1984 | 1981-1984 | 1991-2002 |
CB with parallel twin
In 1978 Honda presented new models of the CB 250 T (type code 367) and CB 400 T series , known in Japan and the USA from 1977 to 1979 as the CB 250 T Hawk and from 1980 to 1981 as the Super Hawk (MC 03). It was a completely redesigned parallel twin engine with balance shafts. The 250 had 27 hp for a very short time in Germany, the 400 43 hp. In the course of a more favorable insurance classification, the respective services were then changed for 250 cm³ to 17 hp and for 400 cm³ to 27 hp (or 43 hp, if you choose). However, the T model series was stylistically revised after just one year and replaced by the CB 250 N and CB 400 N models .
Last models
From 1980 a CB 250 RS (MC 02) was also built, the engine of which was derived from the single-cylinder Enduro XL 250 and developed 17 or 26 hp, the CBX 250 RS (MC 10) from 1983 had 30 hp, the CBX 250 S. (MC 12) from 1985 had 28 HP. A parallel model CL 250 (type code 290) was also reissued according to the old scrambler tradition. This had the single cylinder from the Enduro, a raised exhaust system and, as a special feature, a crawler gear that could be switched by a small lever on the handlebar for off-road use on steep inclines.
The CB 250 Nighthawk (MC 24), there was from 1991 and the (MC 26) from 1992 to 2002 with 21 hp at 8500 min -1 .
literature
- Jochen Kuch: Honda motorcycles since 1970, 1st edition, Motorbuch-Verlag, Stuttgart, 2009. (Typenkompass), ISBN 978-3-613-02989-7
- Motorcycle catalog 1970–76, Motor-Presse-Verlag