Keihin CR26 Carburetor Tuning
Fuel Delivery Analysis
Current Configuration
Air Screw
1½
Slow Jet
35
38
40
42
45
48
50
52
55
58
60
62
65
68
70
72
75
Cutaway
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
Needle
YY5 (Rich)
YY6
YY7
YY8
YY9
YY0 (CR26 std)
YY1
YY2
YY3 (Lean)
Y5 (Rich)
Y6
Y7
Y8
Y9
Y0
Y1
Y2
Y3 (Lean)
Clip
Air Jet
150
160
170
180
190
200
210
220
230
240
250
260
270
280
Main Jet
80
85
90
95
100
105
110
115
120
125
130
135
140
145
150
155
160
165
170
175
180
185
190
195
200
Correction
Air Screw
1½
Slow Jet
35
38
40
42
45
48
50
52
55
58
60
62
65
68
70
72
75
Cutaway
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
Needle
YY5 (Rich)
YY6
YY7
YY8
YY9
YY0 (CR26 std)
YY1
YY2
YY3 (Lean)
Y5 (Rich)
Y6
Y7
Y8
Y9
Y0
Y1
Y2
Y3 (Lean)
Clip
Air Jet
150
160
170
180
190
200
210
220
230
240
250
260
270
280
Main Jet
80
85
90
95
100
105
110
115
120
125
130
135
140
145
150
155
160
165
170
175
180
185
190
195
200
Copy Current → Correction
AFR Analysis
Street
Hot Street
Throttle
Measured
Target
Predicted
Delta
Throttle Position
Current Fuel
Correction Fuel
Difference
Primary Component
Current
Correction