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I have a 94 ninja zx6. I have replaced all spark plugs and wires and cleaned the carbs. My bike is all stock. It seems to rev on all four at times but don't at other in nuetral. It takes of in first with little hesitation then gets worse in the higher gears. It will wind up for a few sec then fall on its face like it only on 2 or 3 cylinders. It worked fine one day then not the next. What could it be?

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Just a WAG, but is the in-tank fuel filter partially plugged? You may get a burst of acceleration until the fuel in the float bowls is low, then it becomes limiter to the available gas flow. I would also replace any fuel hoses on the unlikely chance that the inner liner has separated and is chocking off fuel flow.
If you can get it to drop a cylinder or two on the stand or the dino, take the temperature of each exhaust header, find the cooler one/s and check the compression, carb, plug, coil, valve adjustment, with the valve cover off, rotate the engine and see that everything is operating properly, to rule out a sticky valve train part and cam condition, etc condition.

Posted on Jul 31, 2017

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Posted on Jan 02, 2017

  • 9 Answers

SOURCE: 2005 yamaha yzf 250-unstable idle

I had the same problem, Turns out that my shims were finished, replace the chims and check clearences.

Posted on Mar 12, 2009

  • 72 Answers

SOURCE: engine cuts out as you accelerrate when in nuetral.

You might have a coil problem or you might need a sparkplug cupor you need to synchronize your carbs.get your valves check also.

Posted on Mar 24, 2009

  • 3567 Answers

SOURCE: I droped my bike over and I suspect the oil has got in to t carb

You could lay the bike down all day and oil is not going to get in the carbs. You should have a tool kit that came with the bike, (under the seat or inside a side cover). In it is a tool for plug removal. Removing the carbs is easy enough. Just be sure you have a clean, clear area to layout the parts so nothing gets lost.

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. Put the carb back together, clean the air filter and install the carb. Be sure the bolts are tight. INSTALL AN IN-LINE FUEL FILTER. Let the float bowl fill then try it out.

Posted on Apr 12, 2009

  • 70 Answers

SOURCE: 400 Eiger ATV, starts and runs fine, stalls the

If 2 stroke check crank seals, check plug cap for proper resistance,check for good fuel flow to carb.Spark should jump at least a 1/4" gap,NOT JUST the .030 or plug gap.

Posted on Sep 08, 2009

  • 1 Answer

SOURCE: ninja 250r 08fi 9000rpm sputtering problem

so i drove my bike sputtering to school and notice that there werent problems with the fuel system cause i heard the engine drowning in the fuel cause the ignition system couldnt explode it by a to weak spark from the spark plugs, so i only had to change the spark plugs and everything was good as normal

sorry if my story writings look a bit weird, cause i dont speak or write english where i live

Posted on Mar 09, 2010

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I have a 1986 yamaha virago 700 that wont run properly


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1999 kawasaki zx6 starts fine then rev's high when warming...


Hi, im not an expert but i have had this problem with a few 125's and a 250, if it has air chambers on the manifold of the carb to the airbox check they are secure with no holes and tighten up the clips, check the throttle cable tension and throttle body, this might help or might not but as i said im not expert.


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Bike will not start unburned fuel come out from breather hose, what carb problem should I check first?


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Check for spark at the spark plugs.

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Apr 03, 2009 | 2006 Honda VT 750 Shadow

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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!


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