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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

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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

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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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Addtional details in this link: images/4/45/ZX600E13.PDF

hope this helps (remember to rating this free answer).

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