20 Most Recent 1990 kawasaki ZXR 400 Questions & Answers


Hi, Deon for this scenario you will need your service, parts fiche, and owners manual if you can't find the best tool you ever bought for your Kawasaki, despair not, for a mere zero $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need for viewing and printing please click on the blue links below. Good luck and have a wonderful day.
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1990 kawasaki... | Answered on Jul 24, 2018


Hi, Anonymous if your carburetor or exhaust is:
COUGHING is usually caused by an air leak in the intake system and will generally have the same telltale signs, a wet or damp build up of oil/gas seepage at the intake manifold to cylinder head or carburetor to intake manifold connection and in rare instances a worn throttle plate shaft and or seals.
POPPING on deceleration is usually caused by a lean fuel condition or an air leak in the exhaust system and is generally located where black carbon soot is seen as a flashing build up from any joint connection. This condition can easily be remedied by removing and cleaning both joint pieces and reassembling with high temp silicone and torquing the exhaust clamp to the proper spec.
SPITTING is usually caused by a faulty accelerator pump and or nozzle, or the float bowl needle and seat leaking and overflowing through the main jet mixing well nozzle, or the air-fuel mixture screw is adjusted too lean.
BACKFIRING is usually caused by a sticky/tight intake valve or a timing issue, 180 degrees out or cam chain off 1or 2 teeth.
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1990 kawasaki... | Answered on May 26, 2018


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.
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1990 kawasaki... | Answered on Jun 08, 2017


The 2 likely causes are #1 your air-fuel mixture is too lean and/or #2 the cooling system is not functioning properly.
#1 - did you make any recent changes to the air filter/carburetor system, like put in a high performance filter? if so it also usually requires the carbs to be adjusted for more fuel so the air-fuel ratio remains ideal. Check the spark plugs to see if they are light coloured indicating a lean burn.
#2 - the bike is water cooled? have you pulled out the thermostat? it could be stuck partway open, replace it. Try running without one to see if the bike runs cooler

1990 kawasaki... | Answered on Jul 30, 2014


do you have suficiant charge in the battery? were the old indicators the standard kawasaki ones? if so you you must replace the relay with 1 for led indicators, the old relay expects that when you turn on the indicators it will have to suply 12 volts at 42watts, this is not the case with led indicators, i think the horn is coinsedental and not related to the indicator fault, poss needs replacment horn

1990 kawasaki... | Answered on May 01, 2012


it should start if the clutch lever is pulled in even if it is gear, check the kill switch this on a lot of bikes goes faulty and gives the same symptoms as you report
























it

1990 kawasaki... | Answered on Sep 03, 2011


Hi,
Sounds like your engine overheats.
Better check the cooling system!

1990 kawasaki... | Answered on Dec 14, 2010


May be a broken throttle cable. Remove the three screws from the throttle housing and inspect inside.

1990 kawasaki... | Answered on Sep 02, 2010


How many Miles do you have on it?
Have you checked valve adjustments?
Valve adjustments are critical to performance.
I see you mentioned changing coil,did you also change spark plug?
Also the gas we get now has ethanol in it,
People are experiencing many problems with sticking valves and carb problems as result.
Try putting some sea foam in fuel as initial treatment.
And using Stabil fuel additive on regular basis will eliminate the problem,if in fact it has to do with fuel or valves sticking.
I am not expert on this engine by any means but based on my recent experiences.
I would check valve adj first, if you have already changed plug and coil.
Good Luck! and be CAREFUL on that bike !!

1990 kawasaki... | Answered on Jul 28, 2010


No guarantees but try this. Pull the slide from the throat of the carb. Now move the clip on the jet needle down one notch. This will richen the low end mix. Two notches may be needed but do one notch at the start.

1990 kawasaki... | Answered on Feb 09, 2010


try playing with the mixture screw on the carbs this pic below will help you buddy get back to me if no difference7fe98b2.jpg

1990 kawasaki... | Answered on Sep 29, 2009


if an import they some times do not have engine nos.. check on log book,, i had one this year and on log book says no number,,

1990 kawasaki... | Answered on Jun 06, 2009


Sounds like a bad starter without knowing what sounds it made when you turned it over etc. if it did absolutely nothing when you tried to start it but started when jumped via solenoid it’s either wiring between the button and starter or wiring between the solenoid and starter itself

kawasaki ZXR 400... | Answered on Dec 14, 2017


Hi, Lyrical what you need is a wiring diagram that you can find in the back of your service manual if you can not find the first and best tool you ever bought for your bike, despair not, I have found one for you that costs zero dollars. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
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Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

kawasaki ZXR 400... | Answered on Nov 27, 2016


Just above the clutch cover on the right hand side of the engine

kawasaki ZXR 400... | Answered on Feb 23, 2015


over fueling , when was carbs cleaned out last and fuel system cleaned ? is choke sticking on slightly

kawasaki ZXR 400... | Answered on Jan 23, 2014


Like all mechanical issues this is just a matter of elimination.
There is no mention of the exhaust system in the comment.

Is the motor backfiring despite the exhaust? Is there a corroded suppression baffle increasing back pressure? "... looking back this issue has slowly got worse"

There is a balance in the explosive gases, based on the comment.
So it seems the ignition chamber gases / fuel mix is correct. But there is enough fuel air ratio to post ignite, seems like an exhaust side issue from the comments.

Still there is nothing like feet on the ground ;)

kawasaki ZXR 400... | Answered on Nov 22, 2013


try removing your spark plug then turn your engine over a few times but be careful there may be some oil or gas that sputters out so have a rag ready. Do that a few times until you dont see anything coming out then replace spark plug and try starting it again. If that doesnt solve it you may have to replace you rings ( on the pistons)

kawasaki ZXR 400... | Answered on Apr 14, 2012


Try looking under seat on top frame area. See if that helps

kawasaki ZXR 400... | Answered on Jun 17, 2011

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