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2012 kx450f bikes cut out when accelorating

2012 kx450f bike cuts out when accelorating or holding it at one speed

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  • Motorcycles Master
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Check your fuel/air filter These will usually last about 2 years, but this will depend on how the machine is used. If you use the machine a lot off road you should be doing a yearly service approx every six months. Also make sure your fuel pump is running.

Posted on Apr 21, 2013


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Posted on Jan 02, 2017

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SOURCE: idling the bike,wont hold an idle

It sounds as if you have dirt in your fuel line or some bad gas.
I would recommend draining your tank and cleaning it, then replace your fuel filter.

Posted on Dec 03, 2008

  • 6966 Answers

SOURCE: my harley sporster cuts out for a second when going idle speed.

Hi and welcome to FixYa,

Appreciate the direct "Ask Me".

To your concern, it would depend:

  • if you are using stock air filters and airbox, then it would be an air leak. The filter itself could be torn, dislodged, out of position, not seated properly, warped out of form. It could also be the bottom part of the airbox is not fitted snugly to the carbs or the upper portion is not sealing/mating with the lower protion;
  • if you are using aftermarket air filters such as K & N, then you may need to do a bit of rejetting or enrich your air/fuel mixture;
  • if you are using velocity stacks with no filter, then the carbs has be retuned, rejet which may not be enough if the engine is stock.
Good luck and Thank you for using FixYa. Happy Holidays.

Pls be informed that due to my current rank and rating, even a Helpful would be detrimental to my status. Should this solution not address your concern, it would be appreciated if you could just not rate it at all. Cheers.

Posted on Dec 23, 2008

  • 1 Answer

SOURCE: kawasaki gpz 1000 rx 1987 model

Running well at high revs would indicate that all the fuel and air it needs are getting to the engine and you also have a good spark. Probably no problem with air and fuel filter ( if fitted) or sparkplugs.

Running hot, and bad idling are signs of a lean air fuel mixture. The engine is probably not getting enough fuel at low revs.

This could be caused by an air leak between the carburettors and the engine. Check that the vacuum line to the fuel tap is properly secured at both ends. It is behind the fuel line at the tap.

Get a a short length of hollow plastic tube and use it like a stethascope - put one end to your ear and move the other end around your carburettor mounts with your engine revs as low as you can get, and listen for any sucking noises that would indicate a leak. Look for cracks in the rubber inlets.

The other possibility is that there is an internal blockage in the idling jets or idling fuel circuit. This is where dirt tends to lodge because the jet dimensions and passageways are very fine - The high speed jets are much bigger and dirt often just passes straight through.

Try a little bit of choke while the engine is warm to see if you get a stronger low speed response. If so that would point to an internal blockage.

Posted on Mar 21, 2009

  • 420 Answers

SOURCE: engine cuts out

Sounds like mine when the stator was starting to fail.

Posted on Apr 12, 2009

  • 2 Answers

SOURCE: motorcycle dies while riding,like gas is cut off

Check fuel pump. You might have a bad diaphragm.

Posted on Sep 06, 2009

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I have a 2007 keeway f-act 50. it has developed a proble, its starts fine but when i pull the accelorator the bike goes up to around 7000 rpm and the engine starts to cut out. i have checked the HT lead...

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the batery is ok if the engine start avery time. Also the volts are ok.
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Apr 12, 2010 | 2003 Suzuki SV 650

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Did you run out of gas? I know it sounds like a stupid question but I have seen it happen before. If your getting fuel to the carbs then I would have to say check the carbs floats. They may be sticking shut.

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Could be your spark plugs, or maybe your side stand as some bikes if not all of them now have a switch on the side stand which prevents the rider from starting the bike if the stand is extended. So if the spring which retracts the stand is slightly lose, it pulls on the switch and cuts off power. Im not an expert but just check these.

Could also be that your carbs are dirty. So just give them a bit of a service and check for any blockages in there.

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Electric bike cuts out while riding

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