7-7
TUN
SETTING
EC719072
Jet needle adjustment
(For EUROPE, AUS, NZ and ZA)
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 starting positions.
<Example>
6BFY43-74
Diameter of straight portion
Clip position
Taper angle
In the case of the same number of clip posi-
tion, changing from 6BFY43-74 to
6BFY42-74 has the same effect as a lower-
ing of 0.5-clip position. And in the case of the
same number of clip position, changing from
6BFY43-74 to 6BFY44-74 has the same
effect as a rising of 0.5-clip position.
A
Difference in straight portion dia.
B
Difference in clip position
a
Reference needle
b
0.5 richer
c
0.5 leaner
Standard jet needle
6BFY43-74
Diameter of straight
Rich
Lean
Clip position
portion
ø2.72 mm (0.1071 in)
ø2.73 mm (0.1075 in) ø2.74 mm (0.1079 in) ø2.75 mm (0.1083 in) ø2.76 mm (0.1087 in)
Rich
1 richer
6BFY43-72-4
6BFY43-73-4
6BFY43-74-4
6BFY43-75-4
6BFY43-76-4
0.5 richer
6BFY44-72-3
6BFY44-73-3
6BFY44-74-3
6BFY44-75-3
6BFY44-76-3
6BFY42-72-4
6BFY42-73-4
6BFY42-74-4
6BFY42-75-4
6BFY42-76-4
STD
6BFY43-72-3
6BFY43-73-3
6BFY43-74-3
6BFY43-75-3
6BFY43-76-3
0.5 leaner
6BFY44-72-2
6BFY44-73-2
6BFY44-74-2
6BFY44-75-2
6BFY44-76-2
6BFY42-72-3
6BFY42-73-3
6BFY42-74-3
6BFY42-75-3
6BFY42-76-3
Lean
1 leaner
6BFY43-72-2
6BFY43-73-2
6BFY43-74-2
6BFY43-75-2
6BFY43-76-2
1C3-9-31-7A 5/13/05 5:53 PM Page 16
Summary of Contents for YZ125(V)
Page 570: ...TUN MEMO...
