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