Yamaha YZ125/LC Manuel D'atelier Du Proprietaire page 514

A
B
a
b
Diameter of straight
portion
Clip position
Rich 1 richer
0.5 richer
STD
0.5 leaner
Lean 1 leaner
6CHY6-80
6CHY6-81
6CHY6-82
6CHY6-81
6CHY5-81
Rich
ø2.800 mm (0.1102 in)
6CHY6-80-4th groove
6CHY5-80-4th groove
6CHY6-80-3rd groove
6CHY5-80-3rd groove
6CHY6-80-2nd groove
SETTING
EC719072
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,
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.
Standard jet needle
<Example>
6CHY6-81
Diameter of straight portion
Clip position
Taper angle
In the case of the same number of clip posi-
tion changing from 6CHY6-81 to 6CHY5-81
has the same effect as a lowering of 0.5 clip
position.
A Difference in straight portion dia.
B Difference in clip position
a Reference needle
b 0.5 leaner
ø2.810 mm (0.1106 in)
6CHY6-81-4th groove
6CHY5-81-4th groove
6CHY6-81-3rd groove
6CHY5-81-3rd groove
6CHY6-81-2nd groove
7-6
TUN
carburetor setting
6CHY6-81
Lean
ø2.820 mm (0.1110 in)
6CHY6-82-4th groove
6CHY5-82-4th groove
6CHY6-82-3rd groove
6CHY5-82-3rd groove
6CHY6-82-2nd groove