Jetting Specifications

We have developed a list of jetting specifications that we believe will help your bike run its very best. Please remember that sometimes the stock OEM jetting will work just fine, other times you may have to make an adjustment, so use our suggestions below as a guide to help with your jetting problem.


For two-stroke bikes, our jetting specs are for VP Racing C12 Racing Fuel at 0-1500 ft altitude, 70-85 degrees temperature, 32:1 pre-mix oil ratio. We recommend Maxima Castor 927 High Performance 2-Cycle Oil.


For four-stroke bikes, our jetting specs are for premium pump gas at 0-1500 ft altitude at 70-85 degrees temperature.


Please Note: The stock OEM jetting for your specific model is listed first, followed by our recommended jetting underneath that model.


 

 

 
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1994 1993
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1989-1984
ATV
2010
Model
Main
Pilot
Needle
Pos
Screw
Power
Slide
Nozzle
Leak
Other
Honda
CRF150R
138
38
NMQS
3
2.5
 
1.5
 
58
Pro Circuit
138
45
NMQS
3
2.5
 
 
 
58
CRF250R
 
 
 
 
 
 
 
 
 
Fuel Injection
 
 
 
 
 
 
 
 
 
CRF250X
130
40
NCYU
2
2
 
 
 
65
Pro Circuit
158
42
NCYS
4
2.25
 
 
 
55
CRF450X
145
45
NCVU
2
2.5
 
 
 
70
Pro Circuit
155
45
NCYS
3
2.25
Needle # 16204-MEN-671
70
Yamaha
YZ85
138
45
NBKF  
2
2.375
 
 
  
 
Pro Circuit
135
42
NBKF  
2
2
 
 
 
 
YZ125
410
40
6CHY5-80
4
2.25
 
 
 
 
Pro Circuit
410
35
6CHY5-80
3
1.75
  
 
 
  
YZ250
178
50
N3EW
2
1
50
 
 
  
Pro Circuit
175
48
N3EW
2
1
50
7.0
 
 
YZ250F
 
 
 
  
 
 
 
 
 
Pro Circuit
172
45
NKYV
3
2
  
PC Slide Modified
65
*Stock Slide gets mod for $60.00
YZ450F
 
 
 
 
 
 
 
 
 
Fuel Injection
  
 
 
 
  
 
 
 
 
WR250F
 
 
  
 
 
 
  
 
 
Pro Circuit
 
 
 
 
 
 
 
 
 
WR450F
162
45
NFNT
fix
2.25
 
  
 
60
Pro Circuit
 
 
 
 
 
 
 
 
 
Suzuki
RM85
125
50
NAAH  
2
2
 
 
 
 
Pro Circuit
125
48
NAAH  
2
2
 
 
 
 
RM250
168
48
NECJ
3
1
45
7.0
 
 
Pro Circuit
168
48
NECJ
3
1.5
48
7.0
 
 
RM-Z250
 
 
 
 
 
 
 
 
 
Fuel Injection
  
 
 
 
 
 
 
 
  
Kawasaki
KX65
190
25
5GSP68  
3
1.5
 
1.5
O-0
 
Pro Circuit
200
27.5
5GSP68  
2
1.5
 
1.5
O-0
 
KX85
140
45
NAPE  
3
1.375
 
3.5
  
 
Pro Circuit
138
42
NAPE  
2
1.375
 
3.5
 
 
KX100
138
45
NAPF  
4
1.375
 
3.5
 
 
Pro Circuit
138
42
NAPF  
2
1.375
 
3.5
 
 
KX250F
182
40
NHJT
4
1.75
 
 
 
55
Pro Circuit
170
42
NCYS
3
2.5
 
 
 
50
KLX450
145
45
NLZU
Fixed
1.75
  
 
 
50
Pro Circuit
155
40
NCYN
1
2
remove snorkel
 
50
KTM
KTM 65 SX
210
20
 
2
3.5
 
 
 
 
Pro Circuit
195
20
 
1
2
 
 
 
 
KTM 250 SX-F
175
40
OBETP
5
1.25
 
1.5
 
No
Pro Circuit
178
40
OBETP
4
2
 
1.5
 
Leak
wire acc pump

 

2009                    
Model Main Pilot Needle Pos Screw Power Slide Nozzle Leak Other
Honda
CRF150R 138 38 NMQS 3 2.5   1.5   58  
Pro Circuit 138 45 NMQS 3 2.5       58  
CRF250R 188 42 NMGU 3 1.5       70  
Pro Circuit 172 42 NMGU 3 2       48  
CRF250X 130 40 NCYU 2 2       65  
Pro Circuit 158 42 NCYS 4 2.25       55  
CRF450X 145 45 NCVU 2 2.5       70  
Pro Circuit 155 45 NCYS 3 2.25 Needle # 16204-MEN-671 70  
Yamaha
YZ85 138 45 NBKF   2 2.375          
Pro Circuit 135 42 NBKF   2 2          
YZ125 410 40 6CHY5-80 4 2.25   4      
Pro Circuit 410 35 6CHY5-80 3 1.75   4      
YZ250 178 50 N3EW 2 1 50 7      
Pro Circuit 175 48 N3EW 2 1 50 7      
YZ250F 178 42 NFPR 5 2.375       70  
Pro Circuit 175 42 NFPN 4 2       60  
YZ450F 160 45 NFLR 3 1.25       55  
Pro Circuit 160 42 NFLP 5 2.5       50  
WR250F         4          
Pro Circuit                  
WR450F 162 45 NFNT fix 2.25       60  
Pro Circuit                  
Suzuki
RM85 125 50 NAAH   2 2          
Pro Circuit 125 48 NAAH   2 2          
RM250 168 48 NECJ 3 1 45 7      
Pro Circuit 168 48 NECJ 3 1.5 48 7      
RM-Z250 162 45 NLCT 3 2.25 1.5   40  
Pro Circuit 160 40 NKZT 5 2.25       45  
Kawasaki
KX65 190 25 5GSP68   3 1.5   1.5 O-0    
Pro Circuit 200 27.5 5GSP68   2 1.5   1.5 O-0    
KX85 140 45 NAPE   3 1.375   3.5      
Pro Circuit 138 42 NAPE   2 1.375   3.5      
KX100 138 45 NAPF   4 1.375   3.5      
Pro Circuit 138 42 NAPF   2 1.375   3.5      
KX250F 182 40 NHJT 4 1.75       55  
Pro Circuit 170 42 NCYS 3 2.5       50  
KLX450 145 45 NLZU Fixed 1.75       50  
Pro Circuit 155 40 NCYN 1 2 remove snorkel   50  
KTM
KTM 65 SX 210 20   2 3.5          
Pro Circuit 195 20   1 2          
KTM 250 SX-F 175 40 OBETP 5 1.25   1.5      
Pro Circuit 178 40 OBETP 4 2   1.5     wire acc pump

 

2008                    
Model Main Pilot Needle Pos Screw Power Slide Nozzle Leak Other
Honda
CR85R 142 45 NFSF 3 1.5          
Pro Circuit 142 42 NFSF 4            
CRF150R 138 38 NMQS 3 2.5   1.5   58  
Pro Circuit 138 45 NMQS 3 2.5   1.5   58  
CRF250R 188 42 NMGU 3 1.5       70  
Pro Circuit                    
CRF250X 130 40 NCYU 2 2       65  
Pro Circuit                    
CRF450R 178 42 NJYR 3 1.75       50  
Pro Circuit        
CRF450X 145 45 NCVU 2 2.5       70  
Pro Circuit 155 45 NCYS 3 2.25 Needle #16204-MEN-671     70  
Yamaha                    
YZ85 138 45 NBKF 2 2.375          
Pro Circuit 135 42 NBKF 2 2          
YZ125 410 40 6CHY5-80 4 2.25   4.0      
Pro Circuit 410 35 6CHY5-80 3 1.75   4.0      
YZ250 178 50 N3EW 2 1 50 7.0      
Pro Circuit 175 48 N3EW 2 1 50 7.0      
YZ250F 178 42 NFPR 5 2.375       70  
Pro Circuit 175 42 NFPN 4 2       60  
YZ450F 160 45 NFLR 3 1.25       55  
Pro Circuit 160 42 NFLP 5 2.5       50  
WR250F         4          
Pro Circuit                    
WR450F 162 45 NFNT fix 2.25       60  
Pro Circuit                    
Suzuki                    
RM85 125 50 NAAH 2 2          
Pro Circuit 125 48 NAAH 2 2          
RM250 168 48 NECJ 3 1 45 7.0      
Pro Circuit 168 48 NECJ 3 1.5 48 7.0      
RM-Z250 162 45 NLCT 3 2.25   1.5   40  
Pro Circuit 162 45 NLCT 4 2.25       40  
RM-Z450                    
Pro Circuit                    
Kawasaki                    
KX65 190 25 5GSP68 3 1.5   1.5 O-0    
Pro Circuit 200 27.5 5GSP68 2 1.5   1.5 O-0    
KX85 140 45 NAPE 3 1.375   3.5      
Pro Circuit 138 42 NAPE 2 1.375   3.5      
KX100 138 45 NAPF 4 1.375   3.5      
Pro Circuit 138 42 NAPF 2 1.375   3.5      
KX250F 182 40 NHJT 4 1.75       55  
Pro Circuit 170 42 NCYS 3 2.5       50  
KX450F 175 42 NCVR 4 1.75       70  
Pro Circuit 175 42 NCVR 4 2       55  
KLX450 145 45 NLZU Fixed 1.75       50  
Pro Circuit 155 40 NCYN 1 2 remove snorkel     50  
KTM                    
KTM 65 SX 200 25   4 1.5          
Pro Circuit 220 32.5   4 1.5          
KTM 250 SX-F 175 40 OBETP 5 1.25   1.5      
Pro Circuit 178 40 OBETP 4 2   1.5     wire acc pump

 





 

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