Question about 2003 kawasaki KX 250

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I have a kawasaki kx 250 2 stroke an it was running good now it wont start. it has spark it wants to fire up but it just backfires.

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  • tt_roy May 22, 2009

    have a kx 250 wont kick start but will push start ran it for awhile and it wont idle just shuts down all new oils,spark plug and air filter is clean any suggestions???

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Hi murray,

nice bike you have there.

have you checked on the carb ans see if the jet is right and the mixture is normal, this is usually the case if the carb is not tuned right.

better of reset the card, open it clean it, then set to default even if you are using your mixture of gas and 2t. just set to factory default. once it starts give it a few run, 1-2 hours, then set it to how you want your mixture to be.

hope this helps,

regards,

voodoo

Posted on May 17, 2009

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1 Answer

Timing..I.E. late firing


Hi, Spiderman699 for backfiring the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a "LOAD" test "WARNING" you can have 12.5 volts or better but little or zero amps and the battery must be replaced.
2. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
3. Faulty main circuit breaker and or connections.
4. Faulty ignition coil and or connections.
5. Faulty spark plug, oil or gas fouled, wrong heat range or service type, wrong gap, loose in the cylinder head, broken electrode or insulator.
6. Faulty spark plug cables, leaking or broken, internal damage check for spark leakage in the dark.
7. Faulty ignition module, switch, CKP, MAP, CMP, sensor and or any connector in the ignition circuit could have corroded, loose, or broken pins/sockets
8. Burnt exhaust valve or air leak in the exhaust system.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
2007 kawasaki KLX 250 timing marks Google Search
Setting up timing chain problem Kawasaki Forums
Krieger Cam Chain Tensioner 2007 Kawasaki KLX 250
Kawasaki KLX250 Tracker Service Manual
OEM Parts for Kawasaki
Kawasaki KLX250R Owner Manual

May 14, 2017 | 2007 kawasaki KLX 250

1 Answer

Hello I am having problems with my 2004 kawasaki kx 250f. The biggest problem of it all is that I am afraid of running the bike because I do not want to blow a head gasket. When started up the bike...


Starting problems on your bike are usually related to twisting the throttle too often. Remember, the carb has a diaphragm pump in it that gives a shot of gas each time the throttle is twisted. That means the engine can flood quickly if you get happy on the gas. Gently use the kickstart lever to ease the piston just past top center on the compression stroke. Now give a good strong kick. Repeat as needed.

Jul 01, 2011 | 2004 kawasaki KX 250 F

1 Answer

Hi there i have a kxf 250 2004 its hard to start and when it does it back fires alot could it be valves


It could be valves , check all the valve clearances.
also try a new spark plug
and clean the carb
a faulty kill switch can sometimes cause backfire as well

Aug 10, 2010 | 2004 kawasaki KX 250 F

2 Answers

Motorbike wont start after running engine kawasaki kx 250 if i ride my bike for 2 minutes or 50 minutes when ishut down the engine it will not start again until i clean the spark plug


possible bad rings allowing excessive oil seep up and wash spark out on next fire. do a compression check, ck for proper spark, and fuel....hope this helps

Sep 13, 2009 | 2003 kawasaki KX 250

1 Answer

Hey! ,i have a 06 kx 250 2 stroke and shes not giveing any fire !


sounds like your coil is packing in try the coil on another bike buddy if this works on another nike get back to me

Sep 06, 2009 | 2006 kawasaki KX 250

2 Answers

1980 Kawasaki KX 250, starts and runs hard.


Bored maybe, but i doubt stroked. They usually bored them because they blew up the motor, as it doesn't make that big of a difference in power.
Did you check ALL of the passageways in the carburator to make sure they are clear? Also, see that you plug has a fat blue spark, light yellow is a little weak, and may be due to corrosion around the flywheel.
Also the reed pedals can stick and hinder performance, and last, make sure the air filter is cleaned and re-oiled with a good filter oil.

Jul 29, 2009 | 2003 kawasaki KX 250

1 Answer

My kx 250 backfires


Two stroke? never heard one backfire while running. But, a leak doesn't make it run better.

Jul 29, 2009 | 2003 Suzuki RM 250

1 Answer

2002 kx 250 2 stroke wont start


sounds like too much oil in the mix add more gas & clean spark plug
Cheers Rob

Jul 21, 2009 | kawasaki Quad Bikes

1 Answer

My 2007 KXF 250 keeps backfiring? why is this?


Backfires are caused by mixture burning in the exhaust pipe. I would suggest that you check the seal between the exhaust valves and the head when the piston is on the compression stroke. You may have a burnt valve (I understand KXFs are prone to this problem!). Try talking to Teamgreen Kawasaki, they may be able to point you in the right direction. Good Luck!

May 16, 2009 | 2006 kawasaki KX 250 F

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