Mikuni BN/SBN Rebuild info

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)
1.285PSI65PSI55PSI47PSI
1.555PSI43PSI38PSI32PSI
2.032PSI25PSI21PSI18PSI
2.322PSI20PSI17PSI15PSI
2.519PSI17PSI14PSI12PSI

Yamaha Baseline carb settings:

Engine Size / Kit LinkPopoffLow Adjustment screwHigh Adjustment screwCarb Kit:
500ccN/A1 1/4 +/- 1/43/4 +/- 1/4SBT
OEM
650cc25-35PSI1 1/8 +/- 1/41 1/8 +/- 1/4SBT
OEM
SuperJet38-42PSI5/8 +/- 1/45/8 +/- 1/4 (Mag)
1 1/8 +/- 1/4 (PTO)
SBT
OEM
701cc30-40PSI5/8 +/- 1/45/8 +/- 1/4 (Mag)
1 1/8 +/- 1/4 (PTO)
SBT
OEM
760cc35-45PSI1 5/8 +/- 1/43/8 +/- 1/4SBT
OEM
800cc (PV)45-55PSI1 7/8 +/- 1/4
(Both carbs)
1/2 +/- 1/4SBT
OEM
1100cc45-55PSI1 1/8 +/- 1/4 (All carbs)7/8 +/- 1/4SBT
OEM
1200cc38-42PSI1 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)65-75PSI1 1/8 (All carbs)1 1/4 (MAG, Center)
1 1/2 (PTO)
SBT
OEM

Seadoo:

2005
Year/Model/EnginePopoffJettingMixture screwsCarb kit:
2005 GTI (717cc)36-40PSIMain Jet: 167.5
Pilot Jet: 75
Needle: 2.0
Low mixture screw: 1
High mixture screw: 0
SBT
OEM
2004
Year/Model/EnginePopoffJettingMixture screwsCarb kit:
2004 GTI (717cc)
2004 GTI LE (717cc)
36-40PSIMain Jet: 167.5
Pilot Jet: 75
Needle: 2.0
Low mixture screw: 1
High mixture screw: 0
SBT
OEM
2003
Year/Model/EnginePopoffJettingMixture screwsCarb kit:
2003 GTI (717cc)
2003 GTI LE (717cc)
36-40PSIMain Jet: 167.5
Pilot Jet: 75
Needle: 2.0
Low mixture screw: 1
High mixture screw: 0
SBT
OEM
2002
Year/Model/EnginePopoffJettingMixture screwsCarb kit:
2002 GTI (717cc)
2002 GTI LE (717cc)
36-40PSIMain 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)
19-23PSIMain Jet: 162.5
Pilot Jet: 75
Needle: 2.0
Low mixture screw: 1 1/2
High mixture screw: 0
SBT
OEM
2001
Year/Model/EnginePopoffJettingMixture screwsCarb kit:
2001 GS (717cc)
2001 GTS (717cc)
2001 GTI (717cc)
36-40PSIMain 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)
19-23PSIMain Jet: 162.5
Pilot Jet: 75
Needle: 2.0
Low mixture screw: 1 1/2
High mixture screw: 0
SBT
OEM
2000
Year/Model/EnginePopoffJettingMixture screwsCarb kit:
2000 GS (717cc)
2000 GTS (717cc)
2000 GTI (717cc)
36-40PSIMain 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)
19-23PSIMain Jet: 162.5
Pilot Jet: 75
Needle: 2.0
Low mixture screw: 1 1/2
High mixture screw: 0
SBT
OEM
1999
Year/Model/EnginePopoffJettingMixture screwsCarb kit:
1999 GS (717cc)
1999 GTS (717cc)
1999 GTI (717cc)
36-40PSIMain Jet: 167.5
Pilot Jet: 75
Needle: 2.0
Low mixture screw: 1
High mixture screw: 0
SBT
OEM
1999 SPX (787cc)36-40PSIMag 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)
19-23PSIMain Jet: 162.5
Pilot Jet: 75
Needle: 2.0
Low mixture screw: 1 1/2
High mixture screw: 0
SBT
OEM
1998
Year/Model/EnginePopoffJettingMixture screwsCarb kit:
1998 GS (717cc)
1998 GTS (717cc)
1998 GTI (717cc)
36-40PSIMain Jet: 167.5
Pilot Jet: 75
Needle: 1.5
Low mixture screw: 1 1/4
High mixture screw: 0
SBT
OEM
1998 SPX (787cc)36-40PSIMag 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)
19-23PSIMain 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)20-24PSIMain 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)42-47PSIMag 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/EnginePopoffJettingMixture screwsCarb kit:
1997 SP (717cc)20-25PSIMain 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)
23-43PSIMain Jet: 175
Pilot Jet: 67.5
Needle: 1.5
Low mixture screw: 1
High mixture screw: 1 1/2
SBT
OEM
1997 HX (717cc)36-60PSIMain Jet: 130
Pilot Jet: 75
Needle: 1.2
Low mixture screw: 1 1/2
High mixture screw: 0
SBT
OEM
1997 XP (787cc)28-48PSIMag 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)
23-43PSIMain 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/EnginePopoffJettingMixture screwsCarb kit:
1996 SP (587cc)21-37PSIMain 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)
21-37PSIMain 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)
36-60PSIMain Jet: 130
Pilot Jet: 75
Needle: 1.2
Low mixture screw: 1 1/4
High mixture screw: 0
SBT
OEM
1996 HX (717cc)36-60PSIMain 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)
23-43PSIMain Jet: 142.5
Pilot Jet: 70
Needle: 1.5
Low mixture screw: 1
High mixture screw: 1 1/2
SBT
OEM
1995
Year/Model/EnginePopoffJettingMixture screwsCarb kit:
1995 SP (587cc)21-37PSIMain 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)
21-37PSIMain Jet: 147.5
Pilot Jet: 65
Needle: 2.0
Low mixture screw: 1 1/4
High mixture screw: 0
SBT
OEM
1995 GTX (657cc)19-35PSIMain 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)22-37PSIMain 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)
40-56PSIMain Jet: 135
Pilot Jet: 67.5
Needle: 1.2
Low mixture screw: 1 3/4
High mixture screw: 0
SBT
OEM
1994
Year/Model/EnginePopoffJettingMixture screwsCarb kit:
1994 SP (587cc)21-37PSIMain 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)
21-37PSIMain 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)
21-37PSIMain Jet: 125
Pilot Jet: 60
Needle: 2.0
Low mixture screw: 1 1/4
High mixture screw: 3/8
SBT
OEM
1994 XP (657cc)19-35PSIMain 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/EnginePopoffJettingMixture screwsCarb kit:
1993 SP (587cc)
1993 SPI (587cc)
1993 GTS (587cc)
21-37PSIMain 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)
21-37PSIMain 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)21-37PSIMain Jet: 125
Pilot Jet: 60
Needle: 2.0
Low mixture screw: 1 1/4
High mixture screw: 0
SBT
OEM
1992
Year/Model/EnginePopoffJettingMixture screwsCarb kit:
1992 SP (587cc)
1992 GTS (587cc)
21-37PSIMain 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)
21-37PSIMain 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/EnginePopoffJettingMixture screwsCarb kit:
1991 SP (587cc)21-37PSIMain 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)21-37PSIMain 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)21-37PSIMain 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/EnginePopoffJettingMixture screwsCarb kit:
1990 SP (587cc)11.5-12.5PSIMain Jet: 100
Pilot Jet: –
Needle: 2.0
Low mixture screw: 1 3/4
High mixture screw: –
SBT
OEM
1990 GT (587cc)11.5-12.5PSIMain Jet: 110
Pilot Jet: 62.5
Needle: 2.0
Low mixture screw: 1 1/2
High mixture screw: –
SBT
OEM
1989
Year/Model/EnginePopoffJettingMixture screwsCarb kit:
1989 SP (587cc)11.5-12.5PSIMain Jet: 85
Pilot Jet: –
Needle: –
Low mixture screw: 1 3/4
High mixture screw: –
SBT
OEM

4 Comments on “Mikuni BN/SBN Rebuild info”

  1. Very nice write up, appreciate all the data and links you’ve provided, I can tell a lot of time went into this

      1. Hi, ive a dude. What is the meaning of pto and mag center? Thanks. Ive a xlt 1200. I need know the high and low configurated. Thanks

        1. So it is which cylinder the carb corresponds to.
          PTO is the carb/cylinder closest to the pto (driveshaft that leads to jet pump)
          Center is the center one.
          MAG is closest to the “magneto”, which is the flywheel/stator that is closest to the front of the engine.
          They use different carb settings on each one due to some differences in how each one burns, could be one gets a little hotter due to the water routing, or the exhaust tuning favors scavenging into one cyl more than the others, I’m not sure of the specifics, but hopefully knowing which carb gets which settings helps!

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