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
1998
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 50 1368 3rd 2          
Pro Circuit 165 52 R1469 2nd 1.5          
CR250R 175 55 1369 3rd 1.75 42        
Pro Circuit 165 STK 1370 2nd 1.5 STK        
CR500R 170 55 1368 3rd 1.5          
Pro Circuit STK STK STK 2nd STK          
Yamaha                    
YZ80 290 32.5 5H22 3rd 1.5          
Pro Circuit 280 35 STK 2nd STK          
YZ125 350 45 6BEF16-69 4th 2          
Pro Circuit STK STK STK 2nd 1.5          
YZ250 172 48 N3VF 2nd 2          
Pro Circuit 170 STK STK STK 1.5          
Suzuki                    
RM80 210 35 5DP39 4th 1.5          
Pro Circuit 190 30 STK 2nd STK          
RM125                    
Pro Circuit 168 55 STK 3rd 1.5          
RM250                    
Pro Circuit 165 42 NOZG 4th 1.5         Needle# 16009-1759
RMX250                    
Pro Circuit                    
Kawasaki                    
KX60 200 30 5114 STK            
Pro Circuit STK STK STK 2nd            
KX80 125 58 N5HF 3rd 1.5          
Pro Circuit 122 STK STK STK STK         52T Rear, BR10EV Plug
KX100 125 55 N5HF 3rd 1.5          
Pro Circuit 122 STK STK STK STK          
KX125 160 42 1469 3rd 1.5 50        
Pro Circuit 158 STK STK 4th STK STK        
Bored 165 STK 1468 4th STK          
KDX220 145 45 R1173L 3rd 1.5          
Pro Circuit 148 STK STK 2nd STK          
KX250 158 45 NOZG 3rd 1.5 55        
Pro Circuit STK STK STK 2nd STK STK        
KX500 168 58 N82N 3rd 1.5          
Pro Circuit STK 55 STK 2nd STK          
Off Road 168 55 N82Q 3rd 1.5          

 

1997
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 50 1368 3rd 1.75          
Pro Circuit 165 52 STK 2nd 1.5          
CR250R 175 55 1369 3rd 1.75          
Pro Circuit 165 STK 1370 2nd 1.5          
CR500R 170 55 1368 3rd 1.5          
Pro Circuit STK STK STK 2nd STK          
Yamaha                    
YZ80 290 32.5 5H22 3rd 1.5          
Pro Circuit 280 35 STK 2nd STK          
YZ125 350 50 6BEG9-69769 3rd 1.5          
Pro Circuit STK 45 STK 2nd STK          
YZ250 170 48 N4DG 3rd 1.5          
Pro Circuit STK STK STK 2nd STK          
Suzuki                    
RM80 210 35 5DP39 4th 1.5          
Pro Circuit 190 30 STK 2nd STK          
RM125 175 50 1469 4th 1.5          
Pro Circuit 170 STK STK 2nd STK          
RM250 175 48 NIED 3rd 1.75          
Pro Circuit 168 45 NOZG STK 1.25         (KX250 Needle) 16009-1759
RMX250 150 60 1472 3rd 1.5          
Pro Circuit 178 52 1469 STK STK          
Kawasaki                    
KX60 200 30 5114 STK            
Pro Circuit STK STK STK 2nd            
KX80 122 55 N684 3rd 1.5          
Pro Circuit STK STK   2nd STK          
KX100 132 55 N684 3rd 1.5          
Pro Circuit STK STK STK 2nd STK          
KX125 160 40 N2EJ 3rd 1.5          
Pro Circuit 158 38 NIAK 3rd 1.25         STD 35mm
Big Bore 158 38 NIAK 4th 1 1/43         Bore 36mm
KDX220 145 45 R1173L 3rd 1.5          
Pro Circuit 148 STK STK 2nd STK         B9EV Plug
KX250 165 45 N3WF 3rd 1.5          
Pro Circuit STK STK NOZG STK STK         (KX250 Needle) 16009-1759
KX500 168 60 N82R 3rd 1.5          
Pro Circuit STK STK STK 2nd STK          

 

1996
Model
Main
Pilot
Needle
Pos
Screw
Power
Slide
Nozzle
Leak
Other
Honda                    
CR80R 122 55 A2410A 3rd 1.75          
Pro Circuit       2nd 1.5          
CR125R 172 50 1369 3rd 3.5          
Pro Circuit 165 52   2nd 1.5         Close Idle
CR250R 175 52 1369 3rd 2          
Pro Circuit 172     2nd 1.5         Close Idle
CR500R 170 55 1368 3rd 1.5          
Pro Circuit       2nd           Close Idle
Yamaha                    
YZ80 270 35 5H22 3rd 1.5          
Pro Circuit       2nd            
YZ125 350 55 6BEG9-69 3rd 1.75          
Pro Circuit       2nd 1.5          
YZ250 175 42 N3CD 3rd 1.75          
Pro Circuit       2nd 1.5          
Suzuki                    
RM80 210 35 5DP39 4th 1.5          
Pro Circuit 190 30   2nd            
RM125 170 50 R1469M 3rd 2          
Pro Circuit 172 52     1.25          
RM250 172 58 1467 3rd 1.5          
Pro Circuit 175-178 55   2nd 1.25         Close Idle
RMX250 150 60 1472 3rd 1.5          
Pro Circuit 178 48 1469             II141-28610 Head Gasket
Kawasaki                    
KX60 200 30 5114 3rd            
Pro Circuit       2nd            
KX80 122 55 N68U 3rd 1.5          
Pro Circuit       2nd            
KX100 132 55 N68U 2nd 1.5          
Pro Circuit 130                  
28mm Carb 132 55 N68U 3rd 1         Part#15001-1457
KX125 162 42 N2EJ 3rd 1.5          
Pro Circuit 158 35 NIAK 4th            
KDX200 160 48 R1174K 3rd 2          
Pro Circuit       2nd 1.5          
KX250 160 45 NIED 3rd 2          
Pro Circuit 158   NOZG 2nd 1.5          
KX500 168 60 N82R 3rd 1.5          
Pro Circuit       2nd            
Honda Kart                    
CR80R Kart 122 55 A2410A 3rd 1.75          
Pro Circuit 132       1.5          
CR125R Kart 172 50 1369 3rd 2.5          
Pro Circuit 175 55 1468   1.5          

 





 

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