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
1995
Model
Main
Pilot
Needle
Pos
Screw
Power
Slide
Nozzle
Leak
Other
Honda                    
CR80R 125 52 1343 2 1.5          
Pro Circuit 125 52 1343 2 1.5          
CR125R 172 58 1470 3 1.5          
Pro Circuit 165 55 1468 2 1.5         Close Idle
CR250R 175 55 1368 3            
Pro Circuit 172 52 1369 3 1.5         Close Idle
CR500R 170 55 1368 3            
Pro Circuit 170 55 1368 2 1.5         Close Idle
Suzuki                    
RM80 210 35 5DP39 4 1.5          
Pro Circuit 190-200 30 STD 2 1.5          
RM125 180 52 R1469 3 1.5 50        
Pro Circuit 172 52 R1469 2 1.5 50        
RM250 180 52 1470 3 2 50        
Pro Circuit 172 48 1470 2 1.5 50        
RMX250 150 60 1472 3 1.5          
Pro Circuit 178 52 1469 3 1.5         11141-28C10 Head Gasket
Yamaha                    
YZ80 270 35 5H22 3 1.5          
Pro Circuit 270 35 5H22 2 1.5          
YZ125 360 50 6EG36-63 - 2 40        
Pro Circuit 360 50 STD 2 1.5          
YZ250 175 48 1367 3 1.75          
Pro Circuit 175 48 1367 2 1.5          
YZ490                    
Pro Circuit                    
Kawasaki                    
KX80 122 55 N68U 3 1.5          
Pro Circuit 122 55 N68U 2 1.5          
KX125 162 42 N2DL 4 1.5 50        
Pro Circuit 160 42 N2DL 3 1 60        
KDX200 160 48 R1174K 3 2 50        
Pro Circuit 160 48   2 1.5          
KX250 162 45 NOZE 4 2 70        
Pro Circuit 162 45 NOZE 3 1.5          
KX500 168 60 N82R 3 1.5          
Pro Circuit                    

 

1994
Model
Main
Pilot
Needle
Pos
Screw
Power
Slide
Nozzle
Leak
Other
Honda                    
CR80R 125 52 1343 2nd 1.5          
Pro Circuit     1343 2nd 1.5          
CR125R 172 58 1470 3rd 1.5          
Pro Circuit 165 55 1468 2nd 1.5          
CR250R 175 55 1368 Middle 1.5          
Pro Circuit 172 52 1369 2nd 1.5         Close Idle
CR500 170 55 1368 3rd 1.5          
Pro Circuit 170 55 1368 3rd 1.5         Close Idle
Kawasaki                    
KX80 122 55 N68U 3rd 1.5          
Pro Circuit 122 55 N68U 2nd 1.5          
KX125 165 58 N1KM   1.75         Use Thick Reeds
Pro Circuit 160 52 NIAL 2nd 1         Part#12022-1074
KX250 165 45 N1EE 3rd 1.5          
Pro Circuit 158 45 NOZ6 3rd 1.5         Thin Head Gasket
KX500 168 60 N82M 3rd 1.5          
Pro Circuit 168 58 N82M 2nd 2          
KDX200 150 48 R1172N 3rd 1.5         Use KX500 T/A Filter
Pro Circuit 155 48 R1172N 4th 1.5         Take Air Box Top Off
KDX250 165 42 1368   1.5          
Pro Circuit 158 42 1368 2nd 1.5          
Yamaha                    
YZ80 270 35 5H22 3rd 1.5          
Pro Circuit 270 35 5H22 3rd 1.5          
YZ125 330 15 6EJ35-59 2nd 1.5          
Pro Circuit 330 15 6EJ35-59 2nd 1.5          
YZ250 350 40 6EJ33-61 4th 1.75          
Pro Circuit 370 45 6EJ33-61 2nd 1.5          
Suzuki                    
RM80 210 30 5DP39 4th 1.5          
Pro Circuit 200 35 5DP39 2nd 1.5          
RM125 168 50 20714 2nd 1.5         Double Up Reeds (15mm Long)
Pro Circuit 172 52 1469 3rd 1.25         Use The Metal Stops
RM250 180 52 1469MS 3rd 1.5          
Pro Circuit 168 52 1469MS 2nd 1.5         Close Idle & Back Out (10) Clicks
RMX250 150 60 1472 3rd 1.5          
Pro Circuit 178 52 1468 3rd 1.5          
****For all 80's & 125's use plug with heat range of 8 NGK-B8EV
****Forall 250's & 500's use plug with heat range of 9 NGK-B9EV

 

1993
Model
Main
Pilot
Needle
Pos
Screw
Power
Slide
Nozzle
Leak
Other
Honda                    
CR80R                    
Pro Circuit 128 52   2nd 1.5          
CR125R                    
Pro Circuit 165 55 1468 2nd 1.5         Close Idle
CR250R                    
Pro Circuit 172 55 1369 2nd 1.5         Close Idle
CR500R                    
Pro Circuit 170 55 STD 2nd 1.5         Close Idle
Kawasaki                    
KX60                    
Pro Circuit 200 30 STD 3rd 1          
KX80                    
Pro Circuit 122 55 STD 3rd 1.5          
KX125                    
Pro Circuit 168 52 1469 3rd 1.5   6      
KDX200                    
Pro Circuit 155 48 STD 2nd 1.5     Use KX500 T/A Filter & Remove Top Air Box Cover    
KDX250                    
Pro Circuit 165 40 1369 3rd 2          
KX250                    
Pro Circuit 162 50 STD 3rd 1.5   7      
KX500                    
Pro Circuit STD 58 N82R 2nd 2          
Yamaha                    
YZ80                    
Pro Circuit 270 35 STD 3rd 1.75          
YZ125                    
Pro Circuit 310 15-17.5 STD 2 1.5          
YZ250                    
Pro Circuit 350 50 61 3rd 1.75          
WR500                    
Pro Circuit 440-450 45 STD 2nd 2          
Suzuki                    
RM80                    
Pro Circuit 190-200 35 STD 2nd 1.5          
RM125                    
Pro Circuit 340 STD STD 1st 1.5          
RM250                    
Pro Circuit 178 52 1471 2nd 1.5          
RMX250                    
Pro Circuit 178 50 1468 4th 1.5          

 





 

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