Question about 1977 kawasaki Z 650

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OEM Carbs have what appears to be vacuum ports on the very bottom. What are these ports for and should they be leaking fuel?

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They are the float bowl drains. You use them to empty the float bowl of gas ( water, gunk, debis). there is a screw on the bottom that acts as a valve to allow gas to flow through the hose attach fitting.

Posted on Aug 25, 2010

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Posted on Jan 02, 2017

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Longjia 125cc raptor had problems with fuel leaking from the bottom of the carb and though the air filter. Just put a new carb on OK for a few day now doing the same any clues please


New carbs aren't known for leaking unless you had it open and altered some thing. A float can get stuck if you let it sit without using it. Should put stable in your tank and run it so thestable gets into the carbs.
Check above the carb for a gas leak from the gas hoses and check the gas tank. They may be running down onto the carb and just appears like the carbs leaking

Mar 07, 2016 | Motorcycles

1 Answer

1980 suzuki gs550e Where do I hook the 2 ports between carbs 1&2 and carbs 3&4 too? And where does the port on the front of carbs 1&2 go?


The set of ports between each set of carbs are overflow drains in case of tip over. They are routed down in front of the rear tire and left open.
The ports at front of 1&2 usually connect to the fuel valve and actuate the vacuum portion of the fuel valve, that's the small port on the back of the fuel valve.

Jun 22, 2014 | Motorcycles

1 Answer

Fuel drains out of tank when i start the engine


More that likely when you fell the lines to the carb got damaged or partially disconnected and are leaking or the carbs(if it has carbs) has a stuck float which would allow fuel to over fill the bowl and pour out. The petcock is a vacuum controlled unit so that's why it does not put out any fuel until the engine is started (which is when it leaks). The tank may need to be lifted up some to see where the leak is coming from. If the lines are ruptured then replace them. If the carbs are leaking, tap on the bottom of the bowls with the back side of a wooden hammer (or something soft) and sometimes that will make them stop leaking.

Jan 17, 2013 | Motorcycles

1 Answer

2003 Honda VF 750 C Magna will not idle


Hi, Roy and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Vacuum line from the petcock to intake manifold cracked.
5. Float needle and seat sticking.
6. Float level too low.
7. Carburetor bowl vent line clogged/blocked/pinched.
8. Idle adjusting screw set too low.
9. Air/fuel mixture screw set too lean.
10. Idle port, transfer ports, slow air jet clogged.
11. Slow fuel jet clogged.
12. Faulty fuel pump.
For more information about your issue and valuable "Free" downloads that you will need please Click on the blue links below. Good luck and have a wonderful day.
Not used to V4 carbs Advice
http://www.magnaownersoftexas.com/forums/index.php?topic=5371.0
Honda Magna VF750C Service Manual
http://www.partsfish.com/page/oem-parts-for-honda
Honda 1995 VF750C Magna Owner Manual

May 25, 2012 | 2003 Honda VF 750 C Magna

1 Answer

Fuel leaking from r1 carb intakes


Hi, Anonymous and the usual suspects are:
1. Damaged or restricted fuel tank venting system.
2. Loose float bowl screws.
3. Damaged float bowl o-ring.
4. improper fuel level in the float bowl.
5. Worn or dirty inlet valve or seat.
6. Damaged or leaking float assembly.
7. Particle contamination in inlet fitting cavity.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
http://www.r1-forum.com/forums/102-00-01-r1-mechanical-help/357105-carbs-leaking-fuel-everywhere.html
Carbs leaking Here is how to fix it
2004 2005 Yamaha YZF R1 Service Manual R1 Moto Data Project
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

May 11, 2012 | Yamaha YZF-R1 Motorcycles

1 Answer

1990 Kawasaki ZXR 400 fuel coming out of carbs overflow pipes


Hi, Emma-shj and the usual suspects are:
1. Damaged or restricted fuel tank venting system.
2. Loose float bowl screws.
3. Damaged float bowl o-ring.
4. improper fuel level in the float bowl.
5. Worn or dirty inlet valve or seat.
6. Damaged or leaking float assembly.
7. Particle contamination in inlet fitting cavity.
8. Damaged petcock diaphragm allowing fuel to flow through the vacuum line into the combustion chamber.
9. Contaminated fuel tank.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
carbs pssing fuel out overflow pipe zxr 400 Biker ie Forums
Carbs leaking Here is how to fix it
Kawasaki ZXR400 Service Manual Supplement Free
Kawasaki ZXR400 ZX400 1989 1999 Repair Service Manual PDF Download Manuals... Complete manual $10 download
OEM Parts for Kawasaki
http://mybikemanuals.com/kawasaki

Jun 08, 2017 | 1990 kawasaki ZXR 400

1 Answer

2005 fireblade fuel tank leak but it dosnt appear to be from the tank it drips a lot of fuel when stopped and left ticking over


Check to see if your fuel line has a crack (under vacuum it wouldn't leak) and make sure your carburetor drain screws are tight.
Also, make sure your fuel petcock is in the ON position and not in the PRI position - because in the ON position, there has to be a vacuum from the carbs to allow fuel flow.
No suckee no gas flow!
Check the petcock itself to make sure it's not leaking.

Mar 02, 2011 | 2005 Honda CBR 1000 RR Fireblade

1 Answer

1993 CBR 900rr gas is leaking from vent tube


Hi, Blackwidowbi and the usual suspects are:
1. Damaged or restricted fuel tank venting system.
2. Loose float bowl screws.
3. Damaged float bowl o-ring.
4. improper fuel level in the float bowl.
5. Worn or dirty inlet valve or seat.
6. Damaged or leaking float assembly.
7. Particle contamination in inlet fitting cavity.
8. Damaged petcock diaphragm allowing fuel to flow through the vacuum line into the combustion chamber.
9. Contaminated fuel tank.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Leaky Carburetor CBR Forum Enthusiast forums for Honda CBR Owners
CBR 600 F2 1994 Fuel overflow Honda Motorcycles FireBlades org
Honda CBR900RR Service Manual
http://www.partsfish.com/page/oem-parts-for-honda
Honda CBR900RR Fire Blade Owner Manual

Sep 15, 2010 | 1993 Honda CBR 900 RR Fireblade

1 Answer

Is not getting enough gas...back firing. Checked carbs they are good. Fuel pump good....what next?


Check for vacuum leaks.

If it's not vacuum leaks, then the only other option is cleaning the carbs, if you know it's not getting enough fuel to run properly.

Aug 20, 2010 | 2003 Yamaha V Star Classic

2 Answers

1980 gs 1000 fuel petcock has two connections where do they go?


On the one that has two hoses does it still have an "Off" position? Usually petcocks that have two hoses, one goes to the carb vacuum, and the other is for a fuel supply for the engine. That way it only allows fuel to flow when the engine is running. I have found these to be a poor design and can often leak and allow fuel to run into the engine if your carbs are acting up. If the replacement only has one hose, then it will work fine, just be sure to cap off the vacuum port on the carb.

Sep 24, 2009 | 1978 Suzuki GS 750 E

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