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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.
| 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 | |||||