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:
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 |
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 |
Very nice write up, appreciate all the data and links you’ve provided, I can tell a lot of time went into this
It sure did. I’m still trying to compile other makes and models, I’ll get them all eventually!
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
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!
Thank you for the information. A ton of help!
I have a 1990 Yamaha Superjet 650 single carb. For the baseline carb settings chart, would I use “650cc” or “SuperJet” for pop off, low, and high?
Also, in your video, the pop off pressure was already in the sweet spot. What do you do if it’s not? Is there a way to adjust that up or down?
Going into my first ever carb rebuilt this spring, on this Mikuni carb. The JetSki dies when giving it heavy throttle from idle. Once you are standing up and going, you can give it wide open throttle and it runs just fine. It’s only from the jump. Currently, I have to lightly feather it until I get up to standing speed or it dies. Thanks!
I believe you would use the superjet settings, the 650 settings I think are meant for sit down skis like the wr3 or such.
If the pop off is wrong you can change the spring, or if it’s a real fine adjustment, get some spare springs and trim a teeny tiny amount off them to dial it in right on the money where you want it.