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TUN
SETTING
EC719071
Jet needle adjustment
(For USA, CDN, ZA, AUS and NZ)
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>
6BGK9-75
Diameter of straight portion
Clip position
Taper angle
Changing from 6BGK9-75 to 6BGK10-75
has the same effect as a raise of 0.5 clip
position.
A Difference in straight portion dia.
B Difference in clip position
a 0.5 richer
b Reference needle
6BGK9-74
6BGK9-75
6BGK9-76
6BGK9-75
6BGK10-75
Standard jet needle 6BGK9-75
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 6BGK9-74-4th groove 6BGK9-75-4th groove 6BGK9-76-4th groove
0.5 richer 6BGK10-74-3rd groove 6BGK10-75-3rd groove 6BGK10-76-3rd groove
STD 6BGK9-74-3rd groove 6BGK9-75-3rd groove 6BGK9-76-3rd groove
0.5 leaner 6BGK10-74-2nd groove 6BGK10-75-2nd groove 6BGK10-76-2nd groove
Lean 1 leaner 6BGK9-74-2nd groove 6BGK9-75-2nd groove 6BGK9-76-2nd groove
5MV-9-10-7 6/12/00 9:02 PM Page 7