The history of the development of motorcycle industry dates back to the distant 1885, when the famous German engineer Gottlieb Daimler designed the simplest motorcycle stroller equipped with a small kerosene engine. The frame and wheels of the first motorcycle were wooden, and its speed barely reached 12 kilometers per hour.
Motorcycles appeared in the Soviet Union in the early thirties and, in fact, they were copied from German counterparts. The domestic IZH-350 motorcycle was an exact copy of the German DKW NZ-350, the remaining models of the Kiev plant repeated the parameters of Wanderer, a German motorcycle manufactured by BMW.
Production start
The K-750 motorcycle is the first model with which the production of two-wheeled vehicles began. The weight of the whole structure was 318 kilograms, an engine of 745 cc / cm developed a capacity of 25 liters. from. The motorcycle was equipped with a four-speed gearbox, the rotation on the drive wheel was transmitted using a cardan shaft, which provided a fairly smooth ride.
The brake system consisted of two reliable drum mechanisms with flexible cable drives. A twenty-liter fuel tank made it possible to cover a distance of 350 kilometers without refueling. Fuel consumption was not more than 6 liters per 100 kilometers. The K-750 motorcycle from the very beginning of production was considered a successful development, which did not require any changes in design. Well-designed components and assemblies interacted smoothly, and their layout made it possible to easily make all the necessary adjustments that were required during operation.
In its reliability, the K-750 motorcycle was far ahead of its predecessor M-72, and the German prototype Wanderer was hopelessly behind him in terms of cross-country ability and acceleration dynamics. The torquey two-cylinder engine with the opposed pistons in hundredths of a second was gaining momentum, with difficulty restraining power. 26 horsepower was more than enough for acceleration, and for many hours of travel. The Dnieper K-750 motorcycle , one of the modifications of the base model, more economical and faster, was in high demand and was delivered to military units.
An additional drive on a wheelchair provided high maneuverability, as well as an unprecedented smooth ride. In the sixties of the last century, the K-750 motorcycle became the most popular vehicle throughout the USSR. Over the entire production period - from 1959 to 1967 - more than 100 thousand motorcycles were produced, and later modifications of the K-750 were made in large batches.
K-750 with a sidecar reached speeds of up to 90 kilometers per hour. Smoothness was achieved due to rubber springs mounted under the stroller at three points, as well as thanks to hydraulic shock absorbers on all wheels. Of substantial importance in the production of K-750 was its almost one hundred percent unification with units and components of motorcycles produced at the Irbitsky plant. The conveyor of the Kiev factory did not stop for a minute, spare parts were delivered on time by rail. At that time, marketing as such was not, however, Soviet supply structures worked uninterruptedly.
Modernization
After some time, the K-750 model was modernized and became known as the K-750M. The difference was significant. The front linkage fork was replaced with a telescopic, more modern one. A new gearbox was installed with a foot-operated gearshift mechanism of a closed type; the upgraded cardan shaft could be adjusted in length.
Further improvement of the motorcycle concerned the engine, the lower valve design of which did not allow to increase power by increasing the combustion chamber. The design of the motor was radically changed, the valves moved up, the volume of the cylinders remained the same, and the engine power increased to 32 liters. from. Stable power was provided by 5200 rpm, which is a relatively low indicator.
At the same time, the durability and reliability of the motor was increased. The pre-assembled crankshaft was replaced with an all-cast one, the connecting rod roller bearings were replaced with babbit lumps from Moskvich-407. The resource of the crank assembly has increased to 40 thousand kilometers, and the repair has become much easier, since replacing the liners with the next repair size is quite simple. In the process of upgrading the engine, two oil scraper rings were added to the pistons. Later, cylinder heads were replaced, new ones became more ribbed, the degree of cooling increased. The result is a powerful, efficient engine. The K-750 motorcycle has become more speedy and maneuverable.
The speed of the motorcycle increased to 105 kilometers per hour. Fuel consumption decreased by 200 grams and amounted to 5.8 liters per hundred kilometers at a speed of 60 km / h. Efficiency of the engine has become stable-constant, thanks to the installed automatic ignition timing system.
Using
K-750 motorcycles were widely used in law enforcement bodies. In the 50-60s of the last century, motorcycles with a sidecar were the main police patrol transport. In private hands, the K-750 fell infrequently, until there was a massive write-off of vehicles from the army and police units in the early seventies. Almost all decommissioned motorcycles went to retail and were sold out by the population.
Technical characteristics of motorcycles K-750 and K-750M
They are as follows:
- number of seats - in a two-wheeled version, 2 seats, with a stroller - 3 seats;
- dimensions in a two-wheeled version: length 2430, height 825, width 1100 mm;
- with a stroller - width 1700 mm, track 1200 mm;
- wheelbase - 1450 mm;
- engine - boxer, carburetor, gasoline, two-cylinder, four-stroke;
- cylinder diameter - 78 mm;
- compression ratio - 6;
- piston stroke - 78 mm;
- crankshaft rotation speed - 4600-4800 rpm;
- working total volume of cylinders - 746 cc / cm;
- power - 26 l. from.;
- gross weight - 240 kg;
- maximum motorcycle speed - 90 km / h;
- fuel consumption - 6.0 liters per 100 kilometers;
- carburetor brand - K-37A;
- fuel tank capacity - 21 liters;
- ground clearance - 120 mm;
- maximum load - 300 kilograms.
Motorcycle specifications could vary slightly during production.
Electrical equipment
The indicators are as follows:
- ignition system - 6 V battery;
- battery - type ZMT-12;
- generator - type G-414;
- relay regulator - type PP-302;
- breaker-distributor - type PM11A, PM05;
- induction coil - type B2B, B201.
Chassis
Its characteristics are as follows:
- frame - double tubular closed type;
- front suspension - telescopic;
- rear suspension - lever-pendulum, on hydraulic-spring shock absorbers of reverse action;
- front wheel amplitude - 140 mm;
- free wheeling of a back wheel - 95 mm;
- tires, size - 3.75 x 19 inches;
- brakes - drum, shoe, friction linings.
How much is a K-750 motorcycle
Models produced in the 50-60s are rarities and are in demand among collectors. But they are also valuable as a reliable means of transportation. Therefore, the question "how much does the K-750 motorcycle" does not have a definite answer. Prices fluctuate over a fairly wide range of 0 from 12 to 150 thousand rubles (depending on the year of manufacture and technical condition).