Honda 2007 CR125R, Owner'S Manual

Page: 105 / 144

Adjustments for Competition
101
Carburetor Adjustments & Tuning Tips
Jet Needle
The jet needle controls fuel/air mixture over 1/16
to 3/4 throttle. The straight section (1) affects
throttle response at smaller throttle openings. By
changing the position of the clip (2) in its groove,
you can improve acceleration at medium low and
medium speed.
(1) straight section (2) clip
Slow Jet and Air Screw
Refer to Carburetor Minor Adjustments (Page
106).
Standard Tuning Recommendations
For the following recommendations to be
accurate, you must use the standard settings as a
baseline. Also, don’t change any of the settings
until you’ve determined what changes are
necessary.
(2)
(1)
LEANER
RICHER
1st
2nd
3rd
4th
5th
Adjustment
Air screw opening
Slow jet
Jet needle
Needle clip position
Main jet
Float level
Identification number
Standard settings
1 3/4 turns out
#55
6DGY28-68
3rd groove
#430
0.30 in (7.5 mm)
TMX05A
TEMPERATURE
ALTITUDE
10,000 ft (3050 m)
to
7,500 ft (300 m)
7,499 ft (2299 m)
to
5,000 ft (1500 m)
4,999 ft (1499 m)
to
2,500 ft (750 m)
2,499 ft (749 m)
to
1,000 ft (300 m)
999 ft (299 m)
to
Sea Level (0 m)
FAHR.
.
AS:
SJ:
NC:
JN:
MJ:
AS:
SJ:
NC:
JN:
MJ:
AS:
SJ:
NC:
JN:
MJ:
AS:
SJ:
NC:
JN:
MJ:
AS:
SJ:
NC:
JN:
MJ:
–21°
g
0°
2
55
3
6DGY28-68
430
1 3/4
55
3
6DGY29-68
440
1 1/2
55
3
6DGY29-67
450
1 1/4
60
4
6DGY29-67
460
1 3/4
60
4
6DGY29-66
470
–1°
g
20°
2 1/4
55
3
6DGY28-68
420
2
55
3
6DGY28-68
430
1 3/4
55
3
6DGY29-68
440
1 1/2
55
3
6DGY29-67
450
1 1/4
60
4
6DGY29-67
460
19°
g
40°
2 1/2
55
2
6DGY28-69
410
2 1/4
55
3
6DGY28-68
420
2
55
3
6DGY28-68
430
1 3/4
55
3
6DGY29-68
440
1 1/2
55
3
6DGY29-67
450
39°
g
60°
2
55
2
6DGY29-69
400
2 1/2
55
2
6DGY28-69
410
2 1/4
55
3
6DGY28-68
420
2
55
3
6DGY28-68
430
1 3/4
55
3
6DGY29-68
440
59°
g
80°
2 1/4
50
2
6DGY28-70
390
2
55
2
6DGY29-69
400
2 1/2
55
2
6DGY28-69
410
2 1/4
55
3
6DGY28-68
420
1 3/4
55
3
6DGY28-68
430
79°
g
100°
2 1/2
50
2
6DGY28-71
380
2 1/4
50
2
6DGY28-70
390
2
55
2
6DGY29-69
400
2 1/2
55
2
6DGY28-69
410
2 1/4
55
3
6DGY28-68
420
99°
g
120°
2 3/4
50
1
6DGY29-70
370
2 1/2
50
2
6DGY28-71
380
2 1/4
50
2
6DGY28-70
390
2
55
2
6DGY29-69
400
2 1/2
55
2
6DGY28-69
410
ST
AND
ARD
ADJUSTING
Legend
AS: Air Screw opening from fully seated
SJ: Slow Jet
NC: Needle Clip position
JN: Jet Needle
MJ: Main Jet
All jetting is based on
• Standard Jetting
• 32:1 Fuel/Oil Ratio
• Unmodified Engine (Including Porting, Exhaust and Timing)
CENT. –30°
g
–17° –18°
g
–6° –7°
g
5° 4°
g
16° 15°
g
27° 26°
g
38° 37°
g
49°
CR125R/101-110(31KSR620) 5/6/05 1:16 PM Page 101