Question about 1990 kawasaki ZXR 750

1 Answer

Spark plug was drowned from the gas

When i remove the spark plug and start it again, it was found that the
a lot of gas was flowing on the spark plug area... Possible carburator problem

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  • jmamaligsa Jun 17, 2009

    Thanks, I will try to check it again

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  • Master
  • 11,896 Answers

It could be that the floats in carb are sticking, or the the carb is adjusted way to rich allowing more gas to enter cylinder than what can be burned off.
Otherwise, you may have a weak coil which is not giving the bike enough spark to ignite all the gas.

Posted on Jun 17, 2009

  • Nate Stansfield
    Nate Stansfield Jun 17, 2009

    I was just thinking that if you have fuel injection, check the injectors, because one might not be closing.

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THE BLOWERVAC COULD HAVE GAS PROBLEM OR A NO SPARK TO SPARK PLUG PROBLEM. TO DETERMINE THE SPARK PROBLEM FIRST, REMOVE THE SPARK PLUG, LOOK AT THE END OF THE SPARK PLUG (ENGINE END) TO SEE IF IT IS DRY OR WET WITH GAS, THEN RE-ATTACH THE SPARK WIRE WHILE THE SPARK PLUG IS LAYING LOOSE AND PULL THE ROPE TO TURN THE ENGINE AND LOOK TO SEE IF THERE IS SPARK OCCURING AT THE SPARK PLUG. IF THERE IS SPARK PRESENT, YOU HAVE NO PROBLEM WITH SPARK. REPLACE THE PLUG AND WIRE. IF NO SPARK CHECK YOUR WIRE LEADING TO THE SPARK PLUG TO MAKE SURE IT HAS AN ELECTRICAL CONNECTION AT BOTH ENDS, SPARK PLUG END AND ENGINE END. IF LOOSE FIX THE CONNECTION THEN RE-TRY THE SPARK/ENGINE TURN OVER BY ROPE METHOD AGAIN TO SEE THEN IF YOU HAVE SPARK. IF THEN YOU DO HAVE SPARK, RE-ATTACH SPARK PLUG TO THE ENGINE AND RE-ATTACH SPARK PLUG WIRE TO THE SPARK PLUG AND TRY THEN TO START THE ENGINE.
IF THERE WAS A WET PLUG WHEN YOU FIRST REMOVED THE SPARK PLUG AND YOU NOW HAVE SPARK AT THE SPARK PLUG, YOUR ENGINE SHOULD START.
IF IT STILL WILL NOT START AFTER THE SPARK CHECK, I WOULD REPLACE THE SPARK PLUG WITH A NEW ONE.
IF THEN IT WILL NOT START, THEN REMOVE THE SPARK PLUG AGAIN AND POUR A SMALL AMOUNT OF GAS INTO THE ENGINE SPARK PLUG HOLE. A PINT PLASTIC OIL CAP FULL OF GAS IS ENOUGH, DO NOT OVER USE MORE THEN THAT.
THE RE-ATTACH YOUR SPARK PLUG AND SPARK PLUG WIRE AND TRY STARTING THE ENGINE AGAIN. IT MAY TAKE SEVERAL PULLS TO GET THE EXTRA GAS IN THE SPARK HOLE TO BE USED UP BEFORE YOU START TO HEAR IT RUN ALITTLE AND FIRE NOW AND THEN.
IT SHOULD START THEN.
IF THEN IT DOES NOT START, YU HAVE USED UP THE GAS YOU PUT INTO THE ENGINE BY THE CAP FULL METHOD AND IT IS NOT GETTING GAS BY THE GAS TANK SUPPLY.
THIS MEANS THEN YOU HAVE AN IN LINE GAS LINE FILTER THAT IS PLUGGED UP OR YOUR GAS MAY BE OLD IN THE GAS TANK. IF GAS IS NOT OLD AND FILTER IS NOT PLUGGED, THEN YOU NEED TO REMOVE THE GAS LINE LEADING TO THE ENGINE CARBURATOR TO SEE IF IT WILL FLOW FROM THE GAS TANK OUT THE GAS LINE SUPPLY HOSE. IF IT DOES FLOW FREELY, THEN YOU DO NOT HAVE A GAS SUPPLY PROBLEM,
AS LONG AS YOUR GAS IS NOT OLD GAS. OLD GAS WILL GO BAD IN TIME. I'D REPLACE THE GAS WITH NEW AND TRY AGAIN.
IF THIS DOES NOT WORK, THEN ITS CARBURATION CLEAN UP TIME.
IT WILL NEED TO BE REMOVED FROM THE ENGINE BY A FEW BOLTS, HOSE'S REMOVED AND TAKEN APART AND CLEANED. TARNISH FROM GAS AND OIL WILL BLOCK THE CARBURATOR JETS AND VACCUM PUMP FROM WORKING PROPERLY. CLEAN AND REPLACE, TRY AGAIN TO START ENGINE.
MORE GAS IN SPARK PLUG HOLE TO GET GOING MAY BE ANOTHER ATEMPT AFTER CARBURATOR CLEAN UP.

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Have you checked your oil? You need pump oil half way up in reservoir. Open plug on top of pump and check oil. Pump takes SAE 20 or 30

Next, open oil plug below engine and check your oil level. It should come up 1/2 way on dip stick. Engine takes 10W30. Don't turn washer on its side or upside down to drain oil or oil will run into carburetor.

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Check the screen over exhaust port > is it dirty or clogged? Clean with WD-40 or break it out with a screwdriver.
Remove gas filter below gas tank >>> it has a hex bolt >> loosen bolt >> the gas should come flowing out >> put it back if gas comes out
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What about your air filter? Take it off. See if engine fires and runs without air filter. Air filter may be clogged.

While air filter is out, you can see open port to carburetor. Spray some WD-40 into carburetor. Fire up the engine. It should spark real healthy on the WD-40. Keep spraying WD-40 into carburetor to see if you can keep engine going. Don't forget to keep gun trigger open so water is flowing and pressure is not building in pump.

If engine keeps going with WD-40 but dies without it, then your carburetor is very suspect. You might need a new one.

If engine will not keep going with WD-40, then the spark is very suspect.

Change spark plug. Try again. If it doesn't fire up after that, you need to take it to the shop for repair.

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