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Zxr400 loosing power/bogging after 5000rpm

Right, gotta zxr 400, and as the title says its loosing power/bogging down after 5000 rpm. So, Im getting up to speed, and between 4000 and 5000 the bike has the power it should do then just goes. I have also noticed that it is loosing oil? The bike fires up of the first touch of the button and sounds fine. Recent work on the bike has been, a carb strip and clean, new plugs, made sure chain wasnt to tight, and that the brakes are not binding. If anybody can point be in the right direction to start identifying the problem, I would be very thankfull. Also if anyone wants more info, as im not the best at explaining stuff, agin feel free to ask.

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  • thomas dalton May 17, 2013

    adding to this. I have now made sure I have a spark on all four. noticed cylinder 1 plug is black, all the others are fine, and made sure all the plug caps are working by choppin and changing them. Its reving up in neutral fine. just feels like its loosing a cylinder when under load and past 5k revs.


6 Suggested Answers

  • 2 Answers

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Posted on Jan 02, 2017

  • 3567 Answers

SOURCE: honda rvf 400 1994 5000rpm problem

You were probably right when you mentioned the carbs. The only probable electrical problem would be a coil no longer being able to consistantly generate spark faster than 5000 rpm.

Your bike is 15 years old. It is probably time for a carb kit or two, BUT I would suggest you balance and sync the carbs to see if that takes care of the problem before I would do the carb kits. Also, if the fuel petcock, (gas valve), has a water trap bowl on the bottom of the bowl, remove the trap and check for water / rust / trash in the bowl. If you find anything other than gas then Drain one cup of gas from the tank to eliminate most of what was found.

Look to see if the petcock has a screen filter and clean it as well.
If you find any rust or other trash in the gas then get an inline fuel filter to clean up the trash. I would also run through a tank of premium fuel with a carb cleaning additive in the tank. Replaced your air filter lately?

Post a comment to ask more and to let us know how things turn out. I am hoping for a "FixYa" rating. Ride safe.

Posted on Mar 23, 2009

  • 3567 Answers

SOURCE: Cannot start not using the choke and rpm flattens at 4000 rpm

The air screw and the idle screw turn inward until they LIGHTLY seat, then back out one and one half turns. For the dead spot, pull the slide out of the carb and move the clip on the jet needle down one notch. Two notches if needed.

The pilot jet covers the idle function. It sounds like this is not the problem though. The high idle indicates a lean fuel mix. An air leak is leaning the mix. It could be bad intake manifold gaskets, carb and manifold not down tight, loose spark plug, cylinder head not tight, bad head gasket.

If you do want to adjust the pilot jet the, often it is adjustable from the outside of the carb. It is normally located just out side and next to the main jet. It will be brass and have a slot for a small screw driver. If no outside screw, then an inside adjustment screw means removing the float bowl. Turn the jet screw outward 1/4 to 1/2 turn.

Posted on Apr 26, 2009

  • 1 Answer

SOURCE: Backfiring

Hi, maybe its the same problem i had, i have a 1200 goldwing where your spark plug are there are holes if these become clogged the water stays there and causes backfiring, get a metal welding rod or steel coat hanger and push through the hole to clear the water, hope this helps good luck.
regards Mark

Posted on May 11, 2009

Mr BrokRench
  • 1623 Answers

SOURCE: No Power at High RPM

Sounds like a fuel problem, possible stuck needle valve. Did you check for vacuum leaks? How about the fuel itself, did you treat it before storage to prevent gelling and varnish ? If not your entire fuel system may be restricted. Purchase a can of Seafoam...pour in 1/2 of it to a tank of gas, use the other 1/2 on the next tank. Change fuel filter afterwards because any foreign materials will be in the filter from the cleaning process. Third tank normal fill.
Good luck...i hope this helps.

Posted on May 19, 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

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Ride safe
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