Jetting Specifications 2002-2004

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

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

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Pro Circuit

2771 Wardlow Rd

Corona, CA 92882

Phone:

(951) 738-8050

Fax

(951) 738-8065