KTM 250 EXC RACING - Manual (Page 30)

ENGLISH
29
Check chain tension
To check the chain tension, park the motorcycle.
Press the chain upward at the end of the chain sliding component. The
distance between the chain and the swing arm should be approx. 15 mm
(0.6 in). In the course of this procedure, the upper chain portion
A must be
taut (see illustration).
If necessary, correct the chain tension.
ƽ WARNING ƽ
– E XCESSIVE TENSIONING OF THE CHAIN WILL PUT ADDITIONAL LOAD ON THE COMPO -
NENTS OF THE SECONDARY DRIVETRAIN ( CHAIN , BEARINGS OF TRANSMISSION AND
REAR WHEEL ). A SIDE FROM RESULTING PREMATURE WEAR , IF WORST COMES TO
WORST THE CHAIN MAY RUPTURE OR THE COUNTERSHAFT OF THE TRANSMISSION
MAY BREAK
.
– T OO MUCH SLACK IN THE CHAIN , ON THE OTHER HAND , CAN RESULT IN THE CHAIN
JUMPING OFF THE CHAIN WHEELS . I F THIS HAPPENS , THE CHAIN COULD ALSO BLOCK
THE REAR WHEEL OR DAMAGE THE ENGINE .
– I N EITHER CASE THE OPERATOR IS LIKELY TO LOSE CONTROL OF THE MOTORCYCLE .
Correct chain tension
Loosen collar nut 1 , loosen lock nuts 2 , and turn right and left adjusting
screws 3 equally far. Tighten lock nuts.
To ensure the correct alignment of the rear wheel, the marks at the left and
right chain adjusters must be positioned identically in relation to the
reference marks
B . Tighten the counter nut of the adjusting screws.
Before tightening thr collar nut, verify that the chain adjusters 4 are sitting
close to the adjusting screws and that the rear wheel has been aligned with
the front wheel.
Tighten collar nut
1 to 80 Nm.
ƽ WARNING ƽ
– I F YOU DON ’ T HAPPEN TO HAVE A TORQUE WRENCH AT HAND , MAKE SURE YOU
HAVE THE TIGHTENING TORQUE CORRECTED BY A KTM DEALER AS SOON AS
POSSIBLE . A LOOSE AXLE MAY LEAD TO AN UNSTABLE DRIVING BEHAVIOR OF YOUR
MOTORCYCLE .
– T IGHTEN THE COLLAR NUT WITH THE REQUIRED TORQUE . A LOOSE WHEEL SPINDLE
MAY LEAD TO AN UNSTABLE BEHAVIOR OF YOUR MOTORCYCLE .
NOTE:
The large adjusting range of the chain adjusters (32mm) allows you to use
different secondary ratios in combination with the same chain length. The
chain adjusters
4 can be rotated by 180°.
2
3
4
15 mm
A
B
1
3
4
2
B