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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1989-1984
ATV
2001
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 380 45 6BEG20-68 3rd     5      
Pro Circuit 370 37.5 6BEG20-69 2nd 1.5   STD      
CR250R 420 35 6BEH1-73 3rd 1.75   4     S7 Needle Jet
Pro Circuit STD 30 STD 3rd 1.5   STD     3TC141-57
CR500R 170 55 1368 3rd 1.5          
Pro Circuit STD STD STD 2nd 1.5          
Yamaha                    
YZ80 290 32.5 5H22 3rd 1.5          
Pro Circuit 280 35 STD 2nd 1.5          
YZ125 460 25 6BGK9-75 3rd 1.25   5.75      
Pro Circuit 410 30 STD 2nd 1.75   STD      
YZ250 178 50 N1EK 3rd 1 50 7      
Pro Circuit 175 45 STD 2nd 1 48 STD      
Suzuki                    
RM80 210 35 5DP39 4th 1.5          
Pro Circuit 190 30 STD 2nd 1.5          
RM125 460 27.5   3rd 1.5   5.75      
Pro Circuit 430 STD   2nd 1.5   STD      
RM250 162 48 N3WK 3rd 1.5 45 7      
Pro Circuit 160     2nd     STD      
Kawasaki                    
KX60 200 30 5I14 3rd     2 N-8    
Pro Circuit STD STD STD 2nd     STD STD    
KX65 230 40 5H559 3rd 1.5   2ND     0-0 Needle Jet
Pro Circuit 220     4th            
KX85 140 45 NAPE 3rd 1.375   3.5      
Pro Circuit 138 42 STD 2nd 1.25          
KX100 138 45 NAPF 4th 1.375   3.5      
Pro Circuit                    
KX125 360 50 6BEF16-69 4th 2   5.5     S-4 Needle Jet
Pro Circuit 370 45 STD 2nd 2   STD      
KDX200                    
Pro Circuit                    
KDX220                    
Pro Circuit                    
KX250 160 52 NAFF 3rd   48 8      
Pro Circuit 158 STD STD 2nd 1.75 STD STD      
KX500 168 58 N82M 3rd     7      
Pro Circuit STD 55 STD 2nd 1.75          

 

2000
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 360 50 20-69 3rd     4.5     36 TMX Mikuni
Pro Circuit 340 40 20-69 2nd           (Jet Needle) 63-TO
CR250R 180 48                
Pro Circuit 172 STD STD 2nd 1.5          
CR500R 170 55 1368 3rd 1.5          
Pro Circuit STD STD STD 2nd 1.5          
Yamaha                    
YZ80 290 32.5 5H22 3rd 1.5          
Pro Circuit 280 35 STD 2nd 1.5          
YZ125 350 35 53-75 3rd 1.75   6.5     36 TMX Mikuni
Pro Circuit 340 STD STD 2nd 1.75   STD      
YZ250 175 50 N3CW 3rd 1 55 7      
Pro Circuit 172 48 STD 2nd 1 STD        
Suzuki                    
RM80 210 35 5DP39 4th 1.5          
Pro Circuit 190 30 STD 2nd 1.5          
RM125 178 50 R1469L 3rd 1.75 55 6     38 PWX Kehin
Pro Circuit 168 STD STD 2nd 1.5 STD STD      
RM250 158 42 N3WK 3rd 1.5 55 6     38 PWX Kehin
Pro Circuit 155 STD STD STD 1.5         Choke 3 Turns Out
Kawasaki                    
KX60 200 30 5114 3rd            
Pro Circuit STD STD STD 2nd            
KX65 200 40 5H45 2nd 1          
Pro Circuit                    
KX80 125 58 N5HF 3rd 1.5         STD 26 Carb
Pro Circuit 122 STD STD 2nd 1.5          
KX100 125 55 N5HF 3rd 1.5          
Pro Circuit 122 STD STD 3rd 1.5          
KX125 160 45 N7PW 3rd 1.5 55 6      
Pro Circuit 158 40 STD 2nd 1.5 48 STD      
KDX200                    
Pro Circuit                    
KDX220                    
Pro Circuit                    
KX250 160 52 N3WF 3rd 1.5 48 8      
Pro Circuit 158 STD STD 2nd 1.5 STD STD      

 

1999
Model
Main
Pilot
Needle
Pos
Screw
Power
Slide
Nozzle
Leak
Other
Honda                    
CR80R 122 55 A2410A 3rd 1.75          
Pro Circuit STK STK STK 2nd 1.5          
CR125R 172 55 1369L 3rd 1.5          
Pro Circuit 168 50 1369N 3rd 1.5         Needle# 16012-ML3-910
CR250R 185 42 1370D 2nd 1.5          
Pro Circuit 168 55 1370M 3rd 1.5         Needle# 16204-K23-690
CR500R 170 55 1368 3rd 1.5          
Pro Circuit STD STD STD 2ND STD          
Yamaha                    
YZ80 290 32.5 5H22 3rd 1.5          
Pro Circuit 280 35   2nd STK          
YZ125 350 50 6DHY53-76 3rd 2   6.5      
Pro Circuit STD STD STD 3rd 1.25   7     5ET-14112-70
YZ250 172 50 N3VF 2nd 1.75 80        
Pro Circuit 168 48 STD 2nd 1.5 STD        
Suzuki                    
RM80 210 35 5DP39 4th 1.5          
Pro Circuit 190 30 STD 2nd STD          
RM125 180 55 1469M 4th 1.5 55        
Pro Circuit 165 STD STD 3rd 1.5 STD        
RM250 158 45 NIEG 3rd 1.5 55        
Pro Circuit 155 42 STD 2nd 1.5          
RMX250                    
Pro Circuit                    
Kawasaki                    
KX60 200 30 5I14 3rd            
Pro Circuit STD STD STD 2nd            
KX80 125 58 N5HF 3rd 1.5          
Pro Circuit 122 55 STD 3rd 1.5          
KX100 125 55 N5HF 3rd 1.5          
Pro Circuit 122 STD STD 3rd 1.5          
KX125 158 45 N7PW 2nd 2 52        
Pro Circuit STD 50 STD 2nd 2 STD        
KDX200 160 48 R1174K 3rd 2          
Pro Circuit STD     2nd 1.5          
KX250 158 45 N3YK 3rd 2 55        
Pro Circuit STD STD N3WK 3rd 1.25 58 16159-1056 (Power Jet)     16187-1079 (Needle)
KX500 168 58 N82N 3rd 1.75          
Pro Circuit STD 55 STD 2nd 1.5          
Off Road STD 55 N82Q 3rd 1.5          
KTM                    
KTM125 190 48 NOZH 3rd 1.5          
Pro Circuit STD STD   2nd 1.5          
KTM200 180 45 NOZH 3rd 1.5          
Pro Circuit                    
KTM250 172 45 NOZG 2nd 1.5          
Pro Circuit                    
KTM380 17048 NOZG 2nd 1.5            
Pro Circuit STD 50 1467 3rd 1.5          

 





 

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