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.


 

 

 

 
2024
2023
2022
2021
2020
2019
2018 2017
2016
2015
2014
2013
2012
2011
2010 2009
2008
2007
2006
2005
2004
2003
2002 2001
2000
1999
1998
1997
1996
1995
1994 1993
1992
1991
1990
1989-1984
ATV
2004
Model
Main
Pilot
Needle
Pos
Screw
Power
Slide
Nozzle
Leak
Other
Honda                    
CR85R       3            
Pro Circuit 122 52 STK 2 1.5          
CR125R             4.5      
Pro Circuit 390 40 6DGY26-69 3 2   4.5      
CR250R 420 32.5 6CHY12-82 2 1.5          
Pro Circuit 400 32.5 6CHY12-82 2 1.25          
CRF250R 160 40 NCYR 4 2       68  
Pro Circuit 162 42 NCYR 3 2       55  
CRF250X       4            
Pro Circuit 158 42 NCYS 4 2.25       55  
CRF450R 165 42 NCYR 4 1.5          
Pro Circuit 168 42 NCYR 4 1.75          
Yamaha                    
YZ85 138 45 NBKF 2 2.375          
Pro Circuit 135 42 NBKF 2 2          
YZ125 410 40 6CHY6-81 3 1.75          
Pro Circuit 410 37.5 6CHY6-81 2            
YZ250 178 50 N3EJ 2 1 50 7.0      
Pro Circuit 175 48 N3EJ 2 1 50 7.0      
YZ250F 180 42 OBEKR 4 1.625          
Pro Circuit 182 45 OBEKR 4 1.75          
YZ450F                    
Pro Circuit                    
Suzuki                    
RM85 125 50 NAAH 2 2          
Pro Circuit 122 48 NAAH 2 2          
RM125                    
Pro Circuit 360 35   2 1.5          
RM250 168 48 NECJ 3 1.5 45 7.0      
Pro Circuit 165 45 NECJ 2 1.5 45 7.0      
RM-Z250 178 40 OBEKS 4         60  
Pro Circuit 165 42 OBEKR 4 2       60  
Kawasaki                    
KX/RM60 200 30 5114 3            
Pro Circuit 200 30 5114 2            
KX/RM65 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      
KX/RM100 138 45 NAPF 4 1.375   3.5      
Pro Circuit 138 42 NAPF 2 1.375   3.5      
KX125 420 40 6CHJ10-82 3 2.5   5.75      
Pro Circuit 400 35 6CHJ10-82 2 1.5          
KX250 165 52 NALF 2 1.5 50 8.0      
Pro Circuit 162 50 NAFG 2 1.5 50 8.0      
KX250F 178 40 OBEKS 4         60  
Pro Circuit 165 42 OBEKR 4 2       60  
KX500 168 58 N82M 3     7.0      
Pro Circuit 168 55 N82M 2     7.0      
 
2004 Discontinued
Model
Main
Pilot
Needle
Pos
Screw
Power
Slide
Nozzle
Leak
Other
KTM 125                    
Pro Circuit                    
KTM 200                    
Pro Circuit                    
KTM 250                    
Pro Circuit                    
KTM 300                    
Pro Circuit                    
KTM 380                    
Pro Circuit                    
KTM 450                    
Pro Circuit                    
KTM 525                    
Pro Circuit                    

 

2003
Model
Main
Pilot
Needle
Pos
Screw
Power
Slide
Nozzle
Leak
Other
Honda                    
CR85R                    
Pro Circuit 122 52                
CR125R 410 40 6DGY22-71 2nd 125          
Pro Circuit 390 37.5 6DGY22-71 2nd 2          
CR250R 420 30 6BHY38-73 2nd 1.5   4.0 S-9    
Pro Circuit 390 32.5 6BEY30-74 3rd 2   4.0 S-8    
CRF450R 170 42 OBELR 5th 1.5          
Pro Circuit 172 42 OBELR 5th 1.5          
Yamaha                    
YZ85 138 45 NBKF 2nd 2.375          
Pro Circuit 135 42 NBKF 2nd 2          
YZ125 410 40 6CHY6-32 3rd 2   4.0      
Pro Circuit 430 37.5 6CHY6-32 2nd 1.5   4.0      
YZ250 178 50 N3EJ 2nd 1 50 7.0      
Pro Circuit 175 48 N3EJ 2nd 1 50 7.0      
YZ250F 178 40 OBELP 4th 1.75          
Pro Circuit 178 38 STD 4th 1.25          
YZ450F 162 42 NCVQ 4th 2          
Pro Circuit 162 40 STD 4th 1.75          
Suzuki                    
RM60 200 30 5114 3rd            
Pro Circuit 200 30 5114 2nd            
RM65 190 25 5GSP68 3rd 1.5   1.5 O-0    
Pro Circuit 200 27.5 5GSP68 2nd 1.5   1.5 O-0    
RM85 125 50 NAAH 3rd 2          
Pro Circuit 122 48 NAAH 2nd 2          
RM100 138 45 NAPF 4th 1.375   3.5      
Pro Circuit 138 42 NAPF 2nd 1.375   3.5      
RM125 460 40 6BGY27-77 3rd 1.5   5.0      
Pro Circuit 440 37.5 6BGY27-77 2nd 1.5   5.0      
RM250 175 48 N8RH 3rd 1.5 50 6.5      
Pro Circuit 165 45 N8RH 2nd 1.5 48 7.0      
Kawasaki                    
KX60 200 30 5114 3rd            
Pro Circuit 200 30 5114 2nd            
KX65 190 25 5GSP68 3rd 1.5   1.5 O-0    
Pro Circuit 200 27.5 5GSP68 2nd 1.5   1.5 O-0    
KX85 140 45 NAPE 3rd 1.375   3.5      
Pro Circuit 138 42 NAPE 2nd 1.375   3.5      
KX100 138 45 NAPF 4th 1.375   3.5      
Pro Circuit 138 42 NAPF 2nd 1.375   3.5      
KX125 420 40 6CHJ11-82 3rd 2.5   5.75      
Pro Circuit 400 37.5 6CHJ11-82 3rd 1.75   5.75      
KDX200                    
Pro Circuit                    
KDX220                    
Pro Circuit                    
KX250 165 52 NAFH 2nd 2 50 8.0      
Pro Circuit 162 50 NAFG 2nd 1.5 50 8.0      
KX500 168 58 N82M 3rd     7.0      
Pro Circuit 168 55 N82M 2nd     7.0      
KTM                    
KTM 125                    
Pro Circuit 192 45 1469H 3rd 2          

 

2002
Model
Main
Pilot
Needle
Pos
Screw
Power
Slide
Nozzle
Leak
Other
Honda                    
CR80R 122 55 A2410A 3rd 1.75          
Pro Circuit STD STD STD 2nd 1.5          
CR125R 400 32.5 6DFY-74 3rd 2.125          
Pro Circuit 390 STD STD 3rd 2          
CR250R 380 32.5 6BEY30-74 2nd 1.5     S-9    
Pro Circuit 380 32.5 6BEY30-74 3rd 1.5     S-8   3TC-14141-S8
CR450R 175 45 OBEKR 4th 1.5          
Pro Circuit STD STD STD STD STD          
Yamaha                    
YZ85 138 45 NBKF 2nd 2.375   3      
Pro Circuit 135 42 STD 2nd 2          
YZ125 420 30 6CHY5-79 3rd 2.5   5.75      
Pro Circuit 390 27.5 6BGK9-76 3rd 2   STD      
YZ250 178 50 N3EJ 2nd 1 50 7.O      
Pro Circuit 175 50 STD 2nd 1.5 50 STD      
YZ250F                    
Pro Circuit                    
YZ426F                    
Pro Circuit                    
Suzuki                    
RM85 125 50 NAAH 3rd 2          
Pro Circuit 122 48 STD 2nd 2          
RM125 460 32.5 6BGY27-77 3rd 1.5   5.O      
Pro Circuit 440 STD STD STD 1.75   5.5      
RM250 165 55 N8RH 3rd 1.5 45 7.O      
Pro Circuit 162 48 STD 2nd 2 STD STD   Choke 12 Clicks Out  
Kawasaki                    
KX60 200 30 5114 3rd     2.O N-8    
Pro Circuit STD STD STD 2ND     STD STD    
KX65 190 25 5GSP68 3rd 1.5   1.5      
Pro Circuit 200 STD STD 2nd     STD      
KX85 140 45 NAPE 3rd 1.375   3.5      
Pro Circuit 138 42 STD 2nd 1.25   STD      
KX100 138 45 NAPF 4th 1.375   3.5      
Pro Circuit STD 42 STD 2nd 1.25   STD      
KX125 350 45 6BEF16-69 3rd 2   5.5 S-4    
Pro Circuit 340 40 6BEF16-70 3rd 1.75   STD STD    
KDX200                    
Pro Circuit                    
KDX220 145 42 R1173L 3rd 1.75          
Pro Circuit STD 50 STD 2nd 1.5          
KX250 165 55 NAFF 2nd 1.25 48 8.O      
Pro Circuit 160 STD STD STD 1.5 STD STD      
KX500 168 58 N82M 3rd     7.O      
Pro Circuit STD 55 STD 2nd 1.75   STD      
KTM                    
KTM125                    
Pro Circuit 192 45 1469H 3rd 2          

 





 

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