Question about 1988 kawasaki ZX 400

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Hi, I cannot start the bike and have proved the spark is ok and battery. I now wish t look at the carb on it. Is the ling plastc screw just under the fuel tank at the side an adjuster and how does it work? I would be grateful for your help

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Na dont do that take ya spark plugs out an put a lil drop ov petty in the heads.. heat ya plugs on cooker an put em bk in ...

Posted on Apr 24, 2010

  • hall ie Apr 25, 2010

    did u put petrol in the heads and heat ya plugs then put em al bk in hot ??? then did it fire up or not ?????? get bk 2 me sfe

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Buddy squirt fuel in air box and see if it fires for a second

Posted on Sep 23, 2009

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I have a pocket bike that wont start unless u put gas where the spark plug is and then it will run&idle but once u give it throttle it dies there is no high or low screw there 1 screw &the idle screw


Hi, Anonymous more than likely it's clogged carburetor jets, obstruction in the fuel system or a faulty battery for more information about your question and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
Common Reasons Why My Pocket Bike Wont Start
Pocket Bike Won Start Help Quick Fix
What To Do If Your Pocket Bike Won Start or any 2 stroke engine
Pocket Bike Not Starting


Jun 01, 2016 | Motorcycles

1 Answer

Hi i have a yamaha fino scooter.. and it wont start. i've cleaned the carbi. changed the spark plug. checked that thers a spark. bleeded the feul line. and adjusted the throttle and idle. any...


Try some spray starting fluid.
That will prove whether or not the spark if ok.
Make sure there is gas in the carb.
The tank may be clogged or the carb float valve could be stuck.

Dec 20, 2010 | Yamaha DT 360 Motorcycles

1 Answer

Girlfriend rode the bike for 1 summer after buying new from the Yamaha dealer. She then stored same in her shed, and covered same with a bike tarp/cover. She did not drain it while it was stored, nor...


HI HAVE YOU CHECKED YOU ARE GETTING A SPARK AT THE PLUG, AFTER THE BIKE HAS BEEN STORED AWAY FOR SOME TIME AND YOU TRY TO START THE MACHINE, DUE TO A COMBINATION OF THINGS THE PLUGS CAN BECOME CONTAMINATED, HENCE FAIL TO SPARK UNDER COMPRESSION, IF THE BIKE HAS STOOD FOR 1 SUMMER I WOULD BE CORRECT IN THINKING YOU HAVE NOW DRAINED THE FUEL AND REPLACED IT WITH NEW, YOU DON,T SAY HOW MANY CYLINDERS THIS ENGINE HAS, OR IF IT IS FUEL INJECTION OR CARBS IF IT IS CARBS THEY MAY NEED TO BE REMOVED AND CLEANED, OR SIMPLY DRAINED BY THE SCREW ON THE LOWER OF THE FLOAT BOWL,

Aug 31, 2010 | Yamaha V Star Silverado Motorcycles

3 Answers

1991 suzuki intruder 1400 starter cranks strong but won't start


the battery will build up calcium and wont hold enough kick charge to start bike thou the battery will test ok in this instance,, this happens when a bike sits for a while without a start

hpoe this helps

May 29, 2009 | 1991 Suzuki VS 1400 Intruder

1 Answer

Hi my yamaha sw 125 trailway does not start first time


Sounds like a battery that will not hold a charge, not enough left in the morning for a good spark. Once running for a short bit the battery gets recharged so the bike starts all day. Then the battery dissipates the charge overnight. Try a morning jump start from your car battery.

Before you spend $50 or so on a battery, look to see if there is water covering the top of the battery plates. If so then the current battery needs to be replaced. If not, add water to cover the top of the plates and ride it for a day. See if it holds a charge now. Battery may still be bad but it was worth a shot.

Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Drain a cup of gas from the tank. Is there any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).

Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new stock NGK spark plug and try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.

Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the idle screw and the air screw on the outside throat of the
carb and spray into the screw holes as well.
< < READ CLOSELY > >
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward. Put the rest of the
carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. This process should get you back on the road.

Please rate this solution. Thanks!


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Apr 27, 2009 | 2001 Yamaha TW 125

1 Answer

Hard start, trouble idleing


Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install new stock spark plugs. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.

Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. This process should get you back on the road.


Please rate this solution. Thanks!

Apr 01, 2009 | 2004 Harley Davidson XL 1200 R Sporster...

1 Answer

Bike wont start


First thing > install a new set of the stock NGK spark plugs for your bike. Check for spark before installing. If no spark, then check to be sure the battery wires are clean and tight. Is the kill switch on? Is the side stand up? It should be up when starting. Is the bike in neutral? Check the fuses. Check the wiring connections, are they tight?

If spark is present, is the gas turned on? Clean or replace the air filter. If the bike still will not start go ahead and drain the
carbs. There should be a screw on the lower side of each carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carbs to fill with gas. If the bike doesn't start properly then shut off the gas and remove the carburetors from the engine.

For both
carbs > remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray all the little airways and fittings in the carb. Remove the two screws on the outside throat of the carb and spray into the screw holes as well.

Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Put the rest of the
carb back together. Remount the carbs.

Next, remove the water trap bowl at the bottom of the petcock, (gas valve). Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ). Turn the gas back on to let the float bowls fill then start the engine. Be sure to balance and sync the carbs when finished. If you don't know how to balance and sync the carbs, get back to me after you do the stuff mentioned above. This process should get you back on the road.

Please rate this solution as " FixYa " if all goes well. Thanks!

Mar 28, 2009 | 2008 Harley Davidson VRSCAW V-Rod

1 Answer

No spark, when it was running it would rev funny at random times. Now wont start. Does anyone have wiring diagrams? or a solution?


Not as much info in the posting as I would like so I will provide a broad answer.

First thing> install a new set of the stock NGK spark plugs for your bike. Check for spark before installing. Still no spark?
How good is the battery? Is the battery nearly full of water as it should be? Are the battery wires clean an tight? Is the kill switch on? Is the side stand up? It should be up when starting. Is the bike in neutral? Check the fuses. Check the wiring connections, are they tight?

If spark is present, is the gas turned on? How clean is the air filter? Clean or replace the air filter.If the bike still will not start go ahead and drain the carbs. There should be
a screw on the lower side of each carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carbs to fill with gas. If the bike doesn't start properly then shut off the gas and remove the carburetors from the engine.

For both carbs > remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray all the little airways and fittings in the carb. Remove the two screws on the outside throat of the carb and spray into the screw holes as well.

Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Put the rest of the carb back together. Remount the carbs.


Next, remove the water trap bowl at the bottom of the petcock, (gas valve). Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ). Turn the gas back on to let the float bowls fill then start the engine. Be sure to balance and sync the carbs when finished. If you don't know how to balance and sync the carbs, get back to me after you do the stuff mentioned above. This process should get you back on the road.

Please rate this solution as " FixYa " if all goes well. Thanks!


Mar 28, 2009 | 1978 Yamaha RD 250

1 Answer

Pw50 problems stating bike


hey there matey,, just to run a few things with,, have u taken the spark plug out and cleaned it up,,try a new plug 1st,, to be sure, or if u have a new plug,, take out the spark plug place it back in its cap and rest it on the cylinder head and either elec start it or kick it over and make sure u have a spark ,, if all is ok on the above,, then turn to fuel and carburetta, make sure fuel is gettin to the carb 1st,, but u say u do eventually gettin it goin ,,then theres a blockage in jets ,,undu the bottom of the carb clean out the bowl, ,in the carb u will see a brass jet, un screw that and the needle guide that the jets screwed in to and using a pin or needle,poke the small hole clean so u can see light threw them,, bung it all back together and pray,, if no joy il get back to ,, ok m8, enjoy

Jan 10, 2009 | Yamaha G5 Motorcycles

1 Answer

Will not start as cold


if it is cranking over and just not firing i would drain your float bowl which you will see a tube coming out the bottom of your carb. it will have a screw right above it loosen that and gas should drain out.i would also think about draining your gas in your tank and putting fresh in.possible new spark plug

Nov 27, 2008 | 2007 Yamaha XT 125 R

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