Hi. I have a Kawasaki zzr400. Had the carbs set. Now bike does not start. Sounds like no fuel going through. What might it be.

best way is to remove the carbs ! get 4 x 4mm drill bits , set carbs on a wide tickover gap on butterflies until you can get the drill bits in the gaps and adjust till all 4 carbs are set the same gaps just slightly touching the butterflie bottom edge and the drill bits trapped between them and carb venturies ! then return the tickover back to shut on the butterflies and look and see if they are all opening and closing together and gaps same after several times ! should be correct if all links are ok ! final tickover setting when fitted on bike to about 600 to 800 rpm ! while the carbs are off you could strip and clean them if you wish ! hope you understand this ! ?? cheers P...

Generally all carbs from the factory have a mixture screw setting of between 1 1/4 and 1 1/2 turn out from being bottomed out. Then I would check the sync on the carbs next. If that doesn't cure it then you can call a parts dept and ask them what the factory jets are and verify that you have those installed. Unless you have a pipe or full exhaust they should be factory. If you have aftermarket exhaust of slip on then you might have to dig a little deeper and see if it has factory parts or a jet kit.

I’m happy to assist further over the phone at https://www.6ya.com/expert/robert_5bac37c3cb991fdb

Fuel system is clogged,..GARAUNTEED!! Take off the fuel tank,to get to the swirl bowl. Inside the swirl bowl,you will find a fuel filter,which SHOULD be completely white,and most likely,its not! Get a new filter and install it. While you have the tank off,disconnect the injector line,and remove and clean the injector with carb cleaner and pressured air.Put everything back together,and then add an INLINE FILTER to the feed line on the fuel pump which is located on the left hand side,running from the shut off valve,to the fuel pump. These are awesome quads,but the fuel injection system is a pain in the a$$.
Good Luck!

Sounds like the bike is struggling with being too lean.
The choke richens the mixture by increasing the fuel to air ratio
Often these old carbs get worn out and allow air in without going via the air box.
However I would look over the bike and ensure all cables and things are working properly. Ensure all gaskets, gromets and surfaces are seated properly.
Lastly cleaning the carb jets will ensure there are no blockages restricting fuel flow

There are adjustments on carbs for low speed air intake (air mixture screw)find out factory settings and reset that mixture.Sounds to me like those adjustments are out of sink.If so the bike will run very bad from idle to about 1/4 throttle then run great from there up to full throttle.this definitly sounds like carb problem.

It obviously sounds like its being starved for fuel, you said that you replaced the pump and the filter, what about the carbs ? has anyone checked them out ?

If the bike has been sitting over the winter and the carbs were not drained or if the fuel wasn't stablized then you might have some dirty carbs, you can try draining the float bowls and then adding fresh fuel see if that helps, if not you'll likely have to pull your carbs and clean then. Todays fuel doesn't las that long before it goes bad.

sounds like carb issues, check fuel contamination and **** in carb first.

• The first thing to do with ANY engine that has sat for any longer than a couple of months is to dump ALL the fuel in the tank and carb(s). ALL OF IT !! You'll want to refill with some high priced fuel that has fuel system cleaners (Like Chevron with Techron) not becasue you need high-test fuel, but because you need the cleaners. It's ether that or disassemble the carbs and clean out jets you can't find much less see. Your choice. The carb kits alone will cost you about $50 so a tank of high-test is looking pretty good, huh?

• Now the fact that you tried to crank the engine with old fuel has fouled the sparkplugs. All of them. Go buy all new sparkplugs.

• If your bike has a vacuum fuel valve, then you'll also need to set the valve to "Prime".

My kawasaki has the same noise, specially when cold, but this should go off when your bike temp goes 1/4.thats my observation with my ZZR400

Hi and welcome to FixYa,

Initially, would suggest:

• a thorough cleanup job on the carbs;
• inspect, clean the rubber couplings from carbs to intake manifold;
• inspect tighten coupling clamps;
• ensure no vacuum leak when re-assembling;
• inspect, check, ensure air intake box seating to the carbs. Very important, there should be no air leak. All air must pass through the cleaner/filter;
• check/clean tank, including fuel valve control and built-in fuel filter;
• use PRIM instead of ON on the fuel valve control.

And the "carborator sleeves" will only slide up when there is sufficient vacuum (engine running) and the throttle is turned.

Good luck and Thank you for using FixYa. Happy Holidays.