Irbit Motorcycle Factory Gear Up 2003, Owner'S Manual

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Chapter 4
ENGINE DESIGN
The motorcycle is equipped with a two-cylinder four-stroke air-cooled engine. The opposed
arrangement of cylinders in the horizontal plane is the outstanding feature of the motorcycle design
which ensures proper cooling and balancing of the crank gear. The engine valves are located in
the cylinder heads.
In summer, carefully observe the heating condition of the engine, power transmission units and the
running gear mechanisms. Under normal heating conditions of the engine, the temperature of the
cylinder heads should not be over 356°F-428°F/180°C-220°C.
During everyday preventive maintenance, clean the engine of mud and dust, paying special
attention to the cooling fins as their fouling will impair the efficiency of the engine cooling. Check
engine crankcase, cylinders and cylinder heads for oil and fuel leaks. Check carburetor to
cylinder head compliance fittings for any cracks or leaks. Visually inspect the alternator for any oil
leaks.