The motorcycle plant in Irbit produced heavy motorcycles with a peculiar design - a powerful frame, a boxer engine, a cardan drive of the drive wheel and an indispensable side trailer. Over the years of production, some elements and components have changed, but the general concept of the machines has remained unchanged. In 1976, the production of the Ural M-67-36 motorcycle began, which continued until the beginning of 1984.
Engine and transmission
The motorcycle used a four-stroke gasoline engine with up to 36 horsepower. Torque was fed to a four-speed gearbox through an automotive-type clutch - dry, equipped with two discs. A cardan shaft was installed between the box and the rear wheel gearbox. The technical characteristics of the Ural M-67-36 motorcycle were significantly increased on the version with a sidecar wheel drive. The drive was carried out by a shaft passing from the rear wheel gearbox to the wheel hub of the side trailer. However, such machines are quite rare. The main part of the motorcycles was released in the classic 2WD version.
To store fuel on the motorcycle "Ural M-67-36" used a tank mounted on the top of the frame. The tank contained only 19 liters of fuel, which was enough for only 220-230 km. The high fuel consumption was associated with the considerable weight of the machine, which, when fully loaded, could reach almost 600 kg. The capricious food system also contributed. Regularly, motorcycles were equipped with two K-301G carburetors, which require precise and synchronous tuning. Therefore, some owners install a carburetor on a Ural M-67-36 motorcycle from other equipment.
Before starting the conversion, free up space on top of the crankcase and gearbox. This place is the most convenient for placing one carburetor with large dimensions. After determining the installation location, it is necessary to calculate and manufacture the intake manifold. The engine itself needs to be carefully checked and the ignition system adjusted, as this is also a common source of problems.
And the most important point is the selection of the most suitable carburetor model. When choosing it, it is necessary to take into account the specifics of the operation of a motorcycle engine, which is fundamentally different from an automobile one. In addition, devices from cars do not behave well when dropped - they can leak fuel, which, if it comes into contact with hot engine parts, can ignite.
Based on these considerations, we should stopyour choice on purely motorcycle models. The most commonly used options are the domestic device K28G or Japanese devices Mikuni or Keihin.
After purchasing carburetors, it is necessary to make inlet pipes. In their manufacture, pipes with an internal diameter corresponding to the diameter of the inlet channels on the cylinders must be used. The shape and length of the nozzles on the left and right cylinders must be the same. At the ends of the branch pipes, it is necessary to make flanges through which they will be securely and hermetically attached to the cylinders. The resulting seams inside the pipes must be sanded, as they will swirl the flow of the fuel mixture and impair engine performance.
After the pipes are made, they must be mounted on the engine and connected to the carburetor. For this, rubber hoses from the cooling system are often used. One end of the hose is put on the pipe, the other - on a special tee mounted on the carburetor. The hoses are sealed with tape or spring clamps. After that, it is necessary to install an air filter of a suitable size on the carburetor. After adapting the handle to one control cable, you can start trying the motorcycle on the go, gradually eliminating possible defects.