Question about 1999 kawasaki ZR-7

1 Answer

Fuel in air box?

I recently just purchased a 2000 zr750 I was told i had a float valve sticking. So i took all the carbs off and replaced them. Which helped sooo much. Now i got raw gas leaking out of my air box. but only if i ride it. My guess is float level? How would i go about fixing that?

Posted by on

  • Anonymous Mar 12, 2009

    so the little pendulium's are just by the air intake side of the carbs? if so how are they alligned to the chamber or adjusted? can this be done with out taking all the carbs off?



1 Answer

  • Level 1:

    An expert who has achieved level 1.


    An expert that hasĀ over 10 points.


    An expert whose answer gotĀ voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 10 Answers

Make sure that all of your little pendulium's that block the gas line when floats are raised are properly aligned in the chamber

Posted on Mar 11, 2009

  • j69bigdaddy Mar 17, 2009

    they are attached to the floats in the bowls of you carb, you should be able to reach these with just removing your seath and gas tank. It is possible to do so while on the bike but it is easier off. Just for comfort reason though.



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

3 Answers

Why won't it idle without choke?

Fuel supply problem somewhere. How is the float adjustment and the float valve? I'd guess the level adjustment is too low.

Mar 28, 2015 | Honda 2005 TRX 400EX

1 Answer

What can cause gas leaking into the air box on a Kawasaki ZR-7?

A float valve in the carbs is sticking or the float height settings are incorrect or a float has a hole in it.

Might also be worth checking your engine's valve clearances while you are at it as there could be a slight pressure leak causing blowback.

Do not use Pri on your fuel tap until this is sorted as it could cause hydraulic lock in your engine, which will wreck it. Fuel will flow through your carbs into the engine when it is parked.
This will also ruin your engine oil as the fuel will mix with it.

May 07, 2014 | 2000 kawasaki ZR-7

2 Answers

Fuel leaking out of carburettor thru air intake valve

try screwing the bolt of the fuuel holderr in the carborator, whhichh is generally used for overflow, screw it tight ,

Apr 15, 2014 | 1996 kawasaki VN 1500 Vulcan Classic

1 Answer

Problem with starting my bike

Sticking floats or worn float valve needles or incorrect float height, tap float bowls to see it overflow stops (sticky float), remove and clean float bowls and fuel inlet passage with carb cleaner and compressed air, check float valve for wear to the rubber tip. Reset float height by slightly bending the metal tab on the float to adjust the closing height of the valve measure from the carb bowl mating surface to the top of the float when fitted then re adjust 1mm at a time higher untill fuel doesnt over flow.

Jan 25, 2012 | 1989 Yamaha FZX 750

2 Answers

I have fuel pouring out my air bleed valve of my left carb barrel and my inner vent solenoid valve on my right carb barrel. At one time my car was flooding out I found one of my vacuum lines was blocked,...

This is usually caused by a stuck float valve. Tap on the carb with a small hammer or screwdriver at the fuel inlet area and the valve may reseat. I usually recommend rebuilding the carb after this happens to prevent a reoccurrence.

Oct 24, 2010 | 1985 Honda Prelude

2 Answers

Fuel leaking into air box.

Probable best to take the carbs back, as there may be something clogging one of the float needle jets.
Although the bike is getting old, the floatlevels dont normally wear out of adjustment, as they have a neoprene end on one end of the needle and a spring loaded pin on the float end,
Unless there is damage to one of the floats.

Note ethanol in fuel can affect some carb parts like neoprene seals

Jun 04, 2010 | 1985 kawasaki ZL 900 A1 Eliminator

1 Answer

I have fuel in crank case in 1996 road king .took off cam cap and oil and gas came out. gasket was leaking. also gas and oil coming out of carbruator.

Usually when you find gasoline in your crankcase it's because your carburator is leaking fuel into the cylinder heads. From there it goes into the cylinders on top of the pistons. Down past the rings into the crankcase. If enough gasoline goes in there, it will go past the sprocket shaft seal and into the primary case as well.

This is normally caused by a bit of trash getting under the float valve in the carburator. But, on a 1996 model, there is supposed to be a vacuum operated petcock. The petcock is supposed to close whenever there is no vacuum on it that is supplied from the intake manifold. Either the petcock has been changed, which is not unusual since the petcocks were quite troublesome, or it is not working properly.

First, you need to clean out the carb. and get any trash out from under the float valve. Remove the carb from the engine. Take the float bowl off the bottom of the carb. Pull the pin out that holds the floats and remove them and the float needle valve. Blow compressed air through the fuel inlet fitting to clean any trash out of the fuel valve seat. Inspect the needle valve for damage, replace if necessary. Reassemble and reinstall the carburator. Check for proper operation prior to starting the engine.

With the carb cleaned, you can install either an aftermarket manual petcock (Pingel) or a Harley petcock for a 1994 or prior model. These are manual petcocks. When you're not riding your bike, turn the petcock to the "OFF" position. Also, install a fuel filter in your fuel line between the tank and the carb. Get one of the good ones with the scintered metal filters in it.

Change your oil and filter. Check your primary oil as well. Change it if contaminated with gasoline. Before you reinstall your air filter, connect the fuel line to the carb and turn the gas on. Closely watch the inside of the carb throat to see if fuel starts to "bubble up" into the throat of the carb. This usually takes a few minutes so be patient. If it does, you need to replace the float valve needle with a new one and check the float setting. If it doesn't "bubble up" you're good to go. Then, don't forget to turn your petcock to the "OFF" position when you quit riding the bike.

Oct 05, 2009 | 2000 Harley Davidson FLHR-FLHRI Road king

2 Answers

Air box and crank case fuel flooding problem happened before, thinking it was stuck or worn float needles; I installed 2 Carb float needles left side facing rear of carbs , all larger main jets, all...

Well there only one way the fuel can get into the crankcase and that's from the fuel tank. The petcock must be draining and the float needles are not stopping the fuel flow. Do you have a prime position on the petcock? If so do not run the bike in the position. Try topping the tank off with gas and letting it sit for a while and see is the gas has gone down and then check the crankcase and see if there's fuel in it again. i still say its got to be your petcock.

Sep 29, 2009 | 2005 kawasaki ZRX 1200 R

1 Answer

My 2000 Vulcan 800 Classic has gas in air filter

Hi and welcome to FixYa,

Your posted description indicates a carb overflow and that the carbs require a pulldown, disassembly; soaking in carb cleaner, cleaning the jets, vents, holes, ports and the walls of the bowl and inner body for the varnish like gunk of old/stale gasoline specially the fuel inlet valve.

As fuel is fed to the carbs,  the floats in the carb's bowl would rise up and engage the inlet cutoff valve closing the inlet port and therefore no further fuel would flow in. Fuel overflow would then indicate possibly that:
  • the valves are not closing;
  • their is an obstruction along the inlet ports and blocks closing of the valves;
  • floats are stuck open or punctured;
  • the float height would require adjustments;
  • necking, ridges, grooves, scratches exist on either the valve or the port allowing fuel entry even if closed.
All of the above would require a pulldown of the carbs for inspection, further cleaning or applicable repairs/rebuilt as initially described.

Good luck and thank you for asking FixYa.

Aug 17, 2009 | 2000 kawasaki VN 800 Vulcan Classic

1 Answer

Pendulums? what are they

They are called fuel floats. they float on top of the fuel in the fuel bowl and are attached to a valve that closes the fuel supply from the tank when a certain fuel level is reached inside the fuel bowl. Fuel level is crucial to air/fuel mixture and overflow can end up in the air box - more likely inside of your engine cases. To ckeck the float level consult your repair manual for instructions.

Mar 12, 2009 | 2000 kawasaki ZR-7

Not finding what you are looking for?
1999 kawasaki ZR-7 Logo

Related Topics:

270 people viewed this question

Ask a Question

Usually answered in minutes!

Top kawasaki Experts

Arnie Burke
Arnie Burke

Level 3 Expert

4536 Answers


Level 3 Expert

77202 Answers


Level 2 Expert

342 Answers

Are you a kawasaki Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides