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23
Chapter 4
BRIEF DESCRIPTION OF DESIGN & MAINTENANCE
ENGINE
The motorcycle is equipped with a twin-cylinder four-stroke carburetor-type air-cooled engine.
Opposed arrangement of cylinders in the horizontal plane is the outstanding feature of the motor-
cycle 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.
Engine maintenance. 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 leaks of oil and fuel.
Completely follow all maintenance intervals specified in the Service Coupons.
LUBRICATION SYSTEM
The motorcycle engine features a dual lubrication system, some parts are force-lubricated by
pressure built up by the oil pump, while others by splashing . A full-flow paper oil filter is provided
in the lubrication system to prolong the engine life.
Maintenance of lubrication system. During the daily inspection, check the oil level in the engine
crankcase and top off the oil if necessary.
The oil dipstick has two grooves showing the lower and the upper oil level limits. In checking the oil
level, wipe the dipstick and insert it into the crankcase without screwing in the dipstick.
The dipstick is positioned
for correct oil level
measurement.