Question about 2000 kawasaki ZR-7

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

I cleaned out all the nooks and crannies on the carbs and only while the bike is running gas shoots into the air box. when i also blow into the vent hoses on the top of the carbs gas shoots into the air box also. all lines are clear. any advice will be great full .

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  • Danny
    Danny May 07, 2014

    i cleaned out all jets with a wire and carb cleaner and compressed air.

  • Danny
    Danny May 07, 2014

    it still shoots gas in the air box with out the air filter on it. also i can blow through the vent hoses on the top of the carb and shoot gas through the jets.

  • Danny
    Danny May 07, 2014

    fuel doesn't leak when the bike is not running only when bike is running.

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  • Master
  • 409 Answers

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.

Posted on May 08, 2014

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Posted on Jan 02, 2017

  • 314 Answers

SOURCE: 2002 Kawasaki ZR-7S. wont rev up.

Check you main jets ccccccthey could need a good wiring through with needle wire cleaners or try running it without any air cleaner unit .If it runs well then could be an air filter problem.

Posted on Mar 14, 2010

  • 440 Answers

SOURCE: Fuel leaking from air box after shutting down

Hi
Thats the float valve seals not shutting off, did you clean them & set the float heights?
The overflows from the carb bottoms must also be blocked for the fuel to fill up the carbs which then leaks into the air filter
Check also that the fuel tap turns off when bike is not running

Ride Safe
Bike-Doc

Posted on May 20, 2010

Porrelli
  • 167 Answers

SOURCE: Have a vaccuum line that

G'day,
Usually there is a hose that connects to both number 2&3 cylinders at the front of the carbies.These two hoses commonly join together with a tee connector & a single hose comes off this tee. leaving this hose dissconnected allows the engine to **** air.This air is being drawn directly into the engine-making the mixture incorrect(too lean),as this air has not had fuel mixed with it.Therefore it needs to be re-connected to its original position(or at least pluged).
Generaly-Here in Australia- this hose connects to the fuel tap to a small spigot at the rear.
This type of fuel tap only allows fuel to flow to the carbies when there is vacume applied to the tap by that hose.This is to help stop the chance of the bike flooding.
Check this link
http://www.mrcycles.com/fiche_section_detail.asp?section=400273&category=Motorcycles&make=KAWASAKI&year=1991&fveh=9164
see the o ring marked part 670- see the part to the right with no number-it has a little spigot on the bottom- Your hose goes there.

Hope this helps
kind regards Andrew Porrelli

Posted on May 18, 2011

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Hi
Thats the float valve seals not shutting off, did you clean them & set the float heights?
The overflows from the carb bottoms must also be blocked for the fuel to fill up the carbs which then leaks into the air filter
Check also that the fuel tap turns off when bike is not running

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