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Mikuni BN/SBN Rebuild info

Tom

2 years ago

Rebuilding a Mikuni Diaphragm Carburetor (BN, SBN, SBN-I, etc)

This page is under construction, There will gradually be more and more information about these Mikuni Carbs

Tools/supplies you may want:
Impact Screwdriver
Carb cleaning needles/brushes
Brake parts cleaner
WD40
Pop-off tester
Fuel pump checkvalve tool
Extra screws for metering block

Needle/Spring popoff chart:

Spring ▶ Needle 🔽	115 Gram (Shiny Silver)	95 Gram (Dull Silver)	80 Gram (Black)	65 Gram (Gold)
1.2	85PSI	65PSI	55PSI	47PSI
1.5	55PSI	43PSI	38PSI	32PSI
2.0	32PSI	25PSI	21PSI	18PSI
2.3	22PSI	20PSI	17PSI	15PSI
2.5	19PSI	17PSI	14PSI	12PSI

Yamaha Baseline carb settings:

Engine Size / Kit Link	Popoff	Low Adjustment screw	High Adjustment screw	Carb Kit:
500cc	N/A	1 ^1/4 +/- ^1/4	^3/4 +/- ^1/4	SBT OEM
650cc	25-35PSI	1 ^1/8 +/- ^1/4	1 ^1/8+/- ^1/4	SBT OEM
SuperJet	38-42PSI	^5/8 +/- ^1/4	^5/8 +/- ^1/4(Mag) 1 ^1/8 +/- ^1/4 (PTO)	SBT OEM
701cc	30-40PSI	^5/8 +/- ^1/4	^5/8 +/- ^1/4 (Mag) 1 ^1/8 +/- ^1/4 (PTO)	SBT OEM
760cc	35-45PSI	1 ^5/8 +/- ^1/4	^3/8 +/- ^1/4	SBT OEM
800cc (PV)	45-55PSI	1 ^7/8 +/- ^1/4 (Both carbs)	^1/2 +/- ^1/4	SBT OEM
1100cc	45-55PSI	1 ^1/8 +/- ^1/4 (All carbs)	^7/8 +/- ^1/4	SBT OEM
1200cc	38-42PSI	1 ^1/4 +/- ^1/4 (Mag, Center) 1 ^1/8 +/- ^1/4 (PTO)	^1/2 +/- ^1/4(Mag, PTO) ^7/8 +/- ^1/4(Center)	SBT OEM
1200R (PV)	65-75PSI	1 ^1/8 (All carbs)	1 ^1/4(MAG, Center) 1 ^1/2 (PTO)	SBT OEM

Seadoo:

2005

Year/Model/Engine	Popoff	Jetting	Mixture screws	Carb kit:
2005 GTI (717cc)	36-40PSI	Main Jet: 167.5 Pilot Jet: 75 Needle: 2.0	Low mixture screw: 1 High mixture screw: 0	SBT OEM

2004

Year/Model/Engine	Popoff	Jetting	Mixture screws	Carb kit:
2004 GTI (717cc) 2004 GTI LE (717cc)	36-40PSI	Main Jet: 167.5 Pilot Jet: 75 Needle: 2.0	Low mixture screw: 1 High mixture screw: 0	SBT OEM

2003

Year/Model/Engine	Popoff	Jetting	Mixture screws	Carb kit:
2003 GTI (717cc) 2003 GTI LE (717cc)	36-40PSI	Main Jet: 167.5 Pilot Jet: 75 Needle: 2.0	Low mixture screw: 1 High mixture screw: 0	SBT OEM

2002

Year/Model/Engine	Popoff	Jetting	Mixture screws	Carb kit:
2002 GTI (717cc) 2002 GTI LE (717cc)	36-40PSI	Main Jet: 167.5 Pilot Jet: 75 Needle: 2.0	Low mixture screw: 1 High mixture screw: 0	SBT OEM
2002 RX (951cc) 2002 GTX (951cc) 2002 XP (951cc)	19-23PSI	Main Jet: 162.5 Pilot Jet: 75 Needle: 2.0	Low mixture screw: 1 1/2 High mixture screw: 0	SBT OEM

2001

Year/Model/Engine	Popoff	Jetting	Mixture screws	Carb kit:
2001 GS (717cc) 2001 GTS (717cc) 2001 GTI (717cc)	36-40PSI	Main Jet: 167.5 Pilot Jet: 75 Needle: 2.0	Low mixture screw: 1 High mixture screw: 0	SBT OEM
2001 RX (951cc) 2001 GTX (951cc) 2001 XP (951cc) 2001 LRV (951cc)	19-23PSI	Main Jet: 162.5 Pilot Jet: 75 Needle: 2.0	Low mixture screw: 1 1/2 High mixture screw: 0	SBT OEM

2000

Year/Model/Engine	Popoff	Jetting	Mixture screws	Carb kit:
2000 GS (717cc) 2000 GTS (717cc) 2000 GTI (717cc)	36-40PSI	Main Jet: 167.5 Pilot Jet: 75 Needle: 2.0	Low mixture screw: 1 High mixture screw: 0	SBT OEM
2000 RX (951cc) 2000 GTX (951cc) 2000 XP (951cc) 2000 LRV (951cc)	19-23PSI	Main Jet: 162.5 Pilot Jet: 75 Needle: 2.0	Low mixture screw: 1 1/2 High mixture screw: 0	SBT OEM

1999

Year/Model/Engine	Popoff	Jetting	Mixture screws	Carb kit:
1999 GS (717cc) 1999 GTS (717cc) 1999 GTI (717cc)	36-40PSI	Main Jet: 167.5 Pilot Jet: 75 Needle: 2.0	Low mixture screw: 1 High mixture screw: 0	SBT OEM
1999 SPX (787cc)	36-40PSI	Mag Main Jet: 140 Pto Main Jet: 142.5 Pilot Jet: 67.5 Needle: 1.5	Low mixture screw: 1 1/2 High mixture screw: 0	SBT OEM
1999 GSX LTD (951cc) 1999 GTX LTD (951cc) 1999 XP LTD (951cc)	19-23PSI	Main Jet: 162.5 Pilot Jet: 75 Needle: 2.0	Low mixture screw: 1 1/2 High mixture screw: 0	SBT OEM

1998

Year/Model/Engine	Popoff	Jetting	Mixture screws	Carb kit:
1998 GS (717cc) 1998 GTS (717cc) 1998 GTI (717cc)	36-40PSI	Main Jet: 167.5 Pilot Jet: 75 Needle: 1.5	Low mixture screw: 1 1/4 High mixture screw: 0	SBT OEM
1998 SPX (787cc)	36-40PSI	Mag Main Jet: 140 Pto Main Jet: 142.5 Pilot Jet: 67.5 Needle: 1.5	Low mixture screw: 1 1/2 High mixture screw: 0	SBT OEM
1998 GSX LTD (951cc) 1998 GTX LTD (951cc)	19-23PSI	Main Jet: 160 Pilot Jet: 80 Needle: 2.0	Low mixture screw: 1 1/4 Mag High mixture screw: 0 Pto High mixture screw: 1/4	SBT OEM
1998 XP LTD (951cc)	20-24PSI	Main Jet: 160 Pilot Jet: 80 Needle: 2.0	Low mixture screw: 1 1/4 Mag High mixture screw: 0 Pto High mixture screw: 1/4	SBT OEM
1998 GSX LTD (5625)	42-47PSI	Mag Main Jet: 160 Pto Main Jet: 162.5 Pilot Jet: 80 Needle: 1.8	Low mixture screw: 1 3/4 High mixture screw: 0	SBT OEM

1997

Year/Model/Engine	Popoff	Jetting	Mixture screws	Carb kit:
1997 SP (717cc)	20-25PSI	Main Jet: 135 Pilot Jet: 57.5 Needle: 2.3	Low mixture screw: 1 3/4 High mixture screw: 0	SBT OEM
1997 GS (717cc) 1997 GSI (717cc) 1997 GTS (717cc) 1997 GTI (717cc)	23-43PSI	Main Jet: 175 Pilot Jet: 67.5 Needle: 1.5	Low mixture screw: 1 High mixture screw: 1 1/2	SBT OEM
1997 HX (717cc)	36-60PSI	Main Jet: 130 Pilot Jet: 75 Needle: 1.2	Low mixture screw: 1 1/2 High mixture screw: 0	SBT OEM
1997 XP (787cc)	28-48PSI	Mag Main Jet: 142.5 Pto Main Jet: 147.5 Pilot Jet: 65 Needle: 1.5	Low mixture screw: 1 3/4 High mixture screw: 0	SBT OEM
1997 SPX (787cc) 1997 GSX (787cc) 1997 GTX (787cc)	23-43PSI	Main Jet: 142.5 Pilot Jet: 70 Needle: 1.5	Low mixture screw: 1 Mag High mixture screw: 0 Pto High mixture screw: 1/2	SBT OEM

1996

Year/Model/Engine	Popoff	Jetting	Mixture screws	Carb kit:
1996 SP (587cc)	21-37PSI	Main Jet: 142.5 Pilot Jet: 65 Needle: 2.0	Low mixture screw: 1 1/4 High mixture screw: 0	SBT OEM
1996 SPI (587cc) 1996 GTS (587cc)	21-37PSI	Main Jet: 147.5 Pilot Jet: 65 Needle: 2.0	Low mixture screw: 1 1/4 High mixture screw: 0	SBT OEM
1996 SPX (717cc) 1996 GTI (717cc)	36-60PSI	Main Jet: 130 Pilot Jet: 75 Needle: 1.2	Low mixture screw: 1 1/4 High mixture screw: 0	SBT OEM
1996 HX (717cc)	36-60PSI	Main Jet: 130 Pilot Jet: 75 Needle: 1.2	Low mixture screw: 1 1/2 High mixture screw: 0	SBT OEM
1996 GSX (787cc) 1996 GTX (787cc) 1996 XP (787cc)	23-43PSI	Main Jet: 142.5 Pilot Jet: 70 Needle: 1.5	Low mixture screw: 1 High mixture screw: 0	SBT OEM

1995

Year/Model/Engine	Popoff	Jetting	Mixture screws	Carb kit:
1995 SP (587cc)	21-37PSI	Main Jet: 142.5 Pilot Jet: 65 Needle: 2.0	Low mixture screw: 1 1/4 High mixture screw: 0	SBT OEM
1995 SPI (587cc) 1995 GTS (587cc)	21-37PSI	Main Jet: 147.5 Pilot Jet: 65 Needle: 2.0	Low mixture screw: 1 1/4 High mixture screw: 0	SBT OEM
1995 GTX (657cc)	19-35PSI	Main Jet: 132.5 Pilot Jet: 75 Needle: 1.5	Low mixture screw: 1 1/4 High mixture screw: 1/4	SBT OEM
1995 SPX (657cc)	22-37PSI	Main Jet: 135 Pilot Jet: 72.5 Needle: 1.2	Low mixture screw: 1 1/8 High mixture screw: 0	SBT OEM
1995 XP (717cc) 1995 HX (717cc)	40-56PSI	Main Jet: 135 Pilot Jet: 67.5 Needle: 1.2	Low mixture screw: 1 3/4 High mixture screw: 0	SBT OEM

1994

Year/Model/Engine	Popoff	Jetting	Mixture screws	Carb kit:
1994 SP (587cc)	21-37PSI	Main Jet: 142.5 Pilot Jet: 65 Needle: 2.0	Low mixture screw: 1 High mixture screw: 0	SBT OEM
1994 SPI (587cc) 1994 GTS (587cc)	21-37PSI	Main Jet: 147.5 Pilot Jet: 65 Needle: 2.0	Low mixture screw: 1 High mixture screw: 0	SBT OEM
1994 SPX (657cc) 1994 GTX (657cc)	21-37PSI	Main Jet: 125 Pilot Jet: 60 Needle: 2.0	Low mixture screw: 1 1/4 High mixture screw: 3/8	SBT OEM
1994 XP (657cc)	19-35PSI	Main Jet: 132.5 Pilot Jet: 75 Needle: 1.5	Low mixture screw: 1 1/4 High mixture screw: 1/4	SBT OEM

1993

Year/Model/Engine	Popoff	Jetting	Mixture screws	Carb kit:
1993 SP (587cc) 1993 SPI (587cc) 1993 GTS (587cc)	21-37PSI	Main Jet: 125 Pilot Jet: 67.5 Needle: 2.0	Low mixture screw: 1 High mixture screw: 0	SBT OEM
1993 SPX (587cc) 1993 GTX (587cc)	21-37PSI	Main Jet: 107.5 Pilot Jet: 62.5 Needle: 2.0	Low mixture screw: 1 1/4 High mixture screw: 0	SBT OEM
1993 XP (657cc)	21-37PSI	Main Jet: 125 Pilot Jet: 60 Needle: 2.0	Low mixture screw: 1 1/4 High mixture screw: 0	SBT OEM

1992

Year/Model/Engine	Popoff	Jetting	Mixture screws	Carb kit:
1992 SP (587cc) 1992 GTS (587cc)	21-37PSI	Main Jet: 125 Pilot Jet: 67.5 Needle: 2.0	Low mixture screw: 1 High mixture screw: 0	SBT OEM
1992 XP (587cc) 1992 GTX (587cc)	21-37PSI	Main Jet: 107.5 Pilot Jet: 62.5 Needle: 2.0	Low mixture screw: 1 1/4 High mixture screw: 0	SBT OEM

1991

Year/Model/Engine	Popoff	Jetting	Mixture screws	Carb kit:
1991 SP (587cc)	21-37PSI	Main Jet: 127.5 Pilot Jet: 75 Needle: 2.0	Low mixture screw: 1 1/2 High mixture screw: 1/4	SBT OEM
1991 XP (587cc)	21-37PSI	Main Jet: 107.5 Pilot Jet: 65 Needle: 2.0	Low mixture screw: 1 1/4 High mixture screw: 1/4	SBT OEM
1991 GT (587cc)	21-37PSI	Main Jet: 107.5 Pilot Jet: 65 Needle: 2.0	Low mixture screw: 1 1/8 High mixture screw: 1/4	SBT OEM

1990

Year/Model/Engine	Popoff	Jetting	Mixture screws	Carb kit:
1990 SP (587cc)	11.5-12.5PSI	Main Jet: 100 Pilot Jet: – Needle: 2.0	Low mixture screw: 1 3/4 High mixture screw: –	SBT OEM
1990 GT (587cc)	11.5-12.5PSI	Main Jet: 110 Pilot Jet: 62.5 Needle: 2.0	Low mixture screw: 1 1/2 High mixture screw: –	SBT OEM

1989

Year/Model/Engine	Popoff	Jetting	Mixture screws	Carb kit:
1989 SP (587cc)	11.5-12.5PSI	Main Jet: 85 Pilot Jet: – Needle: –	Low mixture screw: 1 3/4 High mixture screw: –	SBT OEM

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