Dnepr MT9 - Methods for Checking Motorcycle Parameters

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METHODS FOR CHECKING THE MOTORCYCLE'S PARAMETERS
The free rolling path of the motorcycle is measured by riding a
fully
loaded motorcycle on a st r aight-line section of the hard-surface
road, in dr y weather, at a wind speed not exceedin g· 3 m/s. The mo-
torcycle is acce lerat ed up to 50 km/hr, following which the clutch is
withdrawn, the gea r sh ift lever is set to the ne utral position and th e
motorcycle is allowed to move until it comes to a full stop. Measure-
ments arc made by riding the motorcycle in both di r ect ions. Th e
l
engt h of the rolling path is measured from the point of clutch with-
drawa l to the ful l stop of the motorcyc le.
The free
rolling path is determined as the arithmet ic mean of two
rides in both directions and, ·with the motorc ycle in good repairs,
must be not le ss than 250 m.
The maximum speed is determined by riding on a measured (1 km
lo ng) stretc h of the road , the time being mea s ur ed with a stop-
watch. The maximum speed is determi n ed as the a rit hm et ic mean
of the speeds deve l oped during two rid es in the opposite directions
a nd must be not less than 100 km/hr for the MT9 motorcycle, and
105 km/ hr for the MTIO model.
The acceleration must be sufficient to a llow the motorcycle to
develop th e maximum steady speed before reaching the measured
s tretch of the road, the road cond iti ons being the sa me as when
measuring a free rolling pat h. If the maximum speed is below th e
specified
figure , with the l ength of the free rolling path being nor-
mal, this means that the engine power .is insuffici e nt and the engine
h as to be repaired.
The trial petrol consumption mu st be de termin ed by riding the
se rvi ceab le motor cycle under full load in two opposite directions, on
a m easu red ( 10 km long) s tr etch of the dry, hard-surface road hav-
ing no steep upgrades and descents, with the motorcycle running in
a high gea r at 75 km / hr speed.
The petrol consumption must not exceed 7.2 1 per 100 km (to be
mea s ur ed by adding petrol into the tank from a measuring vessel).
Simultaneously with measuring petrol consumption, oil consumption
is checked, which must not excee d 0.15 I per 100 l<m.
The engine condition to be diagnosed by extraneous noises pro-
duced during the engi ne operation, as we ll as the compression in
the cylinders are checked emp irically by a skilled mechanic of a
se rvice station or maintenance shop (Table 1).
Loca l heating and general overheating can be detected to the
touch. The clutch me c hani sm is checked for condit ion in the follow-
ing manner:
when the e ngine is inop e rativ e, release the clutch and turn the
kick lever, in this case the engine crankshaft must not turn;
when the engine is running, with the first speed gear engaged
and the clutch released, the motorcycle must not move. When gradu-
:ally engaging the clutch release l eve r, the motorc ycle must start
moving smoothly, without jerks. With the gear and clutch engaged,
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JJ