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SETTING
EC71X000
Selecting the rotor
If you feel the engine pick up faster depending
on the course condition, you can control it by
changing the rotor to the one with a greater iner-
tial mass.
Part name
1 1
Standard rotor 5CU-85550-11 0.0004kg•m
2 2 Optional rotor 5UN-85550-00 0.00045kg•m
* Inertial mass: The inertial mass of the body is
proportional to its weight and increases in pro-
portion to the square of the distance between its
rotation center and center of gravity. For the
same weight, a greater distance from its rota-
tion center produces greater inertial mass.
Greater initial mass gives a feeling of greater
torque in response to engine revolutions but is
accompanied by greater pick up resistance.
Engine characteristics are shown below in rela-
tion to each rotor:
9Standard rotor
Engine pickup is faster in the entire engine
speed range.
Pickup is fast at an extremely low engine
speed.
9Optional rotor
A feeling of torque is obtained at high engine
speed.
A broader power band is felt from mid speed to
over revs.
NOTE:
9 Engine pick up differs according to the course
condition, rider, the settings, etc. Select a suit-
able rotor by comparing it with the standard
one in operation.
9 It is difficult to be advantageous under all
course conditions with a change in the rotor.
Measure the lap times in accordance with race
points and select a rotor to produce a good
entire balance.
7-13
TUN
Part number
*Inertial mass
2
2
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