Chapter 4 (Brief Description of Design and
Maintenance)
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 (Fig. 7). A full-flow paper oil filter is
provided in the lubrication system to prolong the engine life.
The lower portion of the crankcase together with the sump are
used as an oil tank for the engine. The single-section oil gear
pump (Fig. 7, #24) is driven from the camshaft through the gear
and connecting bar (Fig. 7, #2). Oil is primed into the engine
crankcase through the hole in the left-hand side which is capped
with the dipstick (Fig. 7, #23).
Maintenance of lubrication system. During the daily inspection,
check the oil level in the engine crankcase and top off 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. Change oil in
the engine crankcase for the first time after 500 km, then as
outlined in the Maintenance Schedule Summary.
Before changing the filter, wash the engine lubrication system. To
this end, fill the crankcase with at least 1 lt. / 1 qt. of fresh oil.
Warm up the engine before changing oil. Drain used oil from the
crankcase and the oil filter cavity having unscrewed drain plug
(Fig. 4, #27) and filter plug (Fig. 4, #24). Change oil filter at the
intervals shown in the Maintenance Schedule Summary.
Submerge the filter in oil prepared for priming the engine, set the
rubber sealing bushing into the filter and fit the filter with the
bushing onto the adapter of plug (Fig. 4, #24), then screw the
latter into the front cover. Now screw in plug (Fig. 4, #24). Fill
engine crankcase with 55.6 oz oil, 12 oz. Ural Oil Treatment.
Let the engine run for 3 - 5 min. Check the oil level again adding
oil up to the top groove of the dipstick. Oil is checked with the
dipstick resting on the engine but not screwed in.
Figure 7. Engine Lubrication System
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