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TUN
SETTING
EC719071
Jet needle adjustment
(For EUROPE)
On the carburetors used in the YZ125, the main
nozzle is a non disassembly type, so it can not
be replaced. Therefore, carburetor setting
requires the change of the jet needle.
1. The jet needle setting parts, having the same
taper angle, are available in different straight
portion diameters and in different taper start-
ing positions.
<Example>
6BHY1-75
Diameter of straight portion
Clip position
Taper angle
Changing from 6BHY1-75 to 6BHY25-75 has
the same effect as a raise of 0.5 clip posi-
tion.
A Difference in straight portion dia.
B Difference in clip position
a 0.5 richer
b Reference needle
6BHY1-74
6BHY1-75
6BHY1-76
6BHY1-75
6BHY25-75
Standard jet needle 6BHY1-75
Diameter of straight
Rich Lean
Clip position
portion
ø2.740 mm (0.1079 in) ø2.750 mm (0.1083 in) ø2.760 mm (0.1087 in)
Rich 1 richer 6BHY1-74-4th groove 6BHY1-75-4th groove 6BHY1-76-4th groove
0.5 richer 6BHY25-74-3rd groove 6BHY25-75-3rd groove 6BHY25-76-3rd groove
STD 6BHY1-74-3rd groove 6BHY1-75-3rd groove 6BHY1-76-3rd groove
0.5 leaner 6BHY25-74-2nd groove 6BHY25-75-2nd groove 6BHY25-76-2nd groove
Lean 1 leaner 6BHY1-74-2nd groove 6BHY1-75-2nd groove 6BHY1-76-2nd groove
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