Question about 2003 kawasaki KX 250

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I have a 2003 kx250 i run it with mc1 50:1 and when i ride it slow around my campsite it will foul a plug and when im out in the trails getting on it hard it will run hard what sould i do so i dont foul out a plug when im riding it slow around the campsites

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  • thtcbrink Jun 20, 2009

    i put a br7 and the stock one is a br8 so i put a hotter plug and it still fouled one of those

  • thtcbrink Jul 06, 2009

    thanks i changed the premix to castor maxima 927 and it runs like a whole new bike

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I would stay with the same heat range(BR8) to stay on the safe side. You didn't say if when you are at the camp sight the bike is cold and just off the truck or warm and right off the trail. But usually alot of 2strokes need to be cleaned out when their being warmed up or they can foul a plug. Get it started, blip the throttle a few times to get some heat in the cylinder and then hold it open until you hear it rev faster and run smooth. Thats usually enough.

Posted on Jun 26, 2009

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YOUR ACTUALLY RUNNING IT TO LEAN YOUR RATIO IS SUPPOSE TO BE 32:1, AND LOVE TO RIDE IS CORRECT MAKE SURE YOU BLOW OUT THE TOP END BY REVVING IT HARD WHEN YOU FIRST START IT. ALSO REV IT OUT ONCE IN AWHILE IF YOU ARE LUGGING IT AROUND, MY 03' WILL FOUL PLUGS ALL THE TIME IF I DON'T KEEP THE RPM'S UP. I RUN A BR8ES IN MINE, DON'T USE THE BR8EIX (IRIDIUM) THEY FOUL EVERY TIME AND THEY ARE EXPENSIVE

Posted on Jul 24, 2009

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Run a hotter plug for the campsite cruising,one step hotter should be fine

Posted on Jun 19, 2009

  • bogues400 Jun 19, 2009

    run a hotter plug for the campsite cruising,one step hotter should be fine

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1 Answer

2003 Kawasaki KX 250 keeps fouling spark plugs


Hi, Nicholaswink and the usual suspects are:
1. The first thing to do if your spark plug has been fouled is to check the air filter. If it's really dirty, that makes it difficult for air to get through to the engine, causing a rich condition. Either clean it thoroughly with some Air Filter Cleaner or buy a new filter. Before you put it back in the air-box, treat with some air filter oil or spray. "WARNING" adding too much oil can also clog up the filter, resulting in another fouled plug.
2. While the gas/oil ratio doesn't equate to what the jetting is, you can still foul plugs, or worse, if the mixture is wrong. Depending on your bike, it's best to look at your owner's manual for the correct ratio. For most 2-stroke motocross bikes, a ratio is 32:1 or 40:1, the gas being 32 or 40, and oil being 1. For those that don't it, it means that for every 128 ounces (one gallon) of gas, you add 4 ounces of 2-stroke oil for a 32:1 ration, or just over 3 ounces for a 40:1 ratio.
If you have too much oil in the mixture (such as 12:1), then you will probably end up fouling the plug because it is more difficult to burn that much oil. Don't try to cut corners with the oil though, because it's very important for your dirt bike's engine. 2-stokes need the oil for lubrication on the cylinder walls, so if you don't have enough (or any for that matter) then the cylinder walls will run dry, causing it to overheat and seize the engine very quickly. So it's very important that you put in the right mixture pre-mix to your 2-stroke gas tank.
Also, 2-strokes have reeds that air and fuel go through into the cylinder, so if they are cracked or broken the bike will not run right. This could cause the plug to foul, so before you go out and buy anything expensive, make sure the reeds are still good.
3. While this usually isn't the main problem, it could be that your spark plug isn't burning hot enough. Having a hotter spark will ignite the fuel stronger, leaving less residual gas/oil in the cylinder that could cause the plug to foul. This "ISN'T" the best choice, but I'd say it's safe to go one plug hotter than stock. Keep an eye on the plug color you're looking for a light tan color anything whiter and you could burn a hole in your piston. Spark plug manufacturers aren't always the same, so make sure you find out how they rate them.
4. Almost every motocross bike comes rich from the factory (especially Honda 2-Strokes when they were being made). It's usually a pretty simple fix, but many riders are too lazy and would rather continue buying plugs instead of spending a few bucks on jets.
5. Piston rings badly worn or broken.
6. Faulty ignition coil low output.
For more information about your question and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
KX 250 Fouling plugs PLEASE HELP
2003 KX250 killing plugs not fouling
https://www.howtomotorcyclerepair.com/images/Kawasaki-KX-125-KX250-Service-Manual-2003-2004-2005-2006-2007-2008.pdf
OEM Parts for Kawasaki
2003 Kawasaki KX250 Owner Manual

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Jun 27, 2012 | 2003 kawasaki KX 250

1 Answer

I have a 2004 CR125R that i baught in 2006 brand new it has less than 20 hours on it. ever since i've got it, it hasn't liked anything other than high rpm/powerband...if im just riding along at...


This sounds like a problem with "idle mixture" There is usually a simple screw with a spring around it on the carb to adjust it. With the engine running warm and idling, be sure that the choke is wide open, and turn that screw in (clockwise) a half a turn. From there, fine tune clockwise to the point that the engine runs rough or 'surges' . Then back it out counterclockwise ¼ turn. That usually gets the fouling and poor running back to normal.

Apr 03, 2017 | 2004 Honda CR 125 R

1 Answer

New plug after warm up and engine running on load for approx an hour engine cuts out and when trying to start again will not start and backfires on kickover. to get started again have to replace with...


Sounds like you are fouling your plug.Some possible causes make sure you air filter is clean. Correct gas oil mixture.How the bike is being use Trail riding/freestyle.This bike in stock form will foul plugs if it is being used as a trail bike.If everything is good air filter/gas-oil. Then you need to do a spark plug reading. This will determine if you need to rejet the carb. Hope this helps
D.

Sep 27, 2010 | 2003 Yamaha YZ 250

2 Answers

What spark plug should i run in my 2003 YZ 125?


Run a B9ES if you don't have a problem with fouling. If you do have a problem fouling, run a B8ES. Both of these plugs are available at auto parts stores for a few bucks each.

The stock plug was a BR9** - the R indicates a resistor plug which is not needed.

Scott

Jun 18, 2010 | 2003 Yamaha YZ 125

1 Answer

2003 Kawasaki KX 250 no spark


Hi, Anonymous and the usual suspects are:
1. Fouled spark plugs.
2. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a preliminary reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead-acid batteries.
3. 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.
4. Loose connection at ignition coil or plug between ignition sensor and module.
5. Spark plug cables in bad condition, shorting/leaking, spark plug cable connections loose check for spark leakage in the dark.
6. Faulty ignition coil or electronic control module.
7. Faulty pulse coil.
8. Faulty CKP, CMP, or BAS sensor.
9. Faulty ignition switch.
10. Faulty run/off switch
11. Tilt sensor needs a reset.
12. Security alarm failing to disarm needs reset
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
2003 KX250 with no spark
Madass No Spark Test Part 1 wmv
https://www.howtomotorcyclerepair.com/images/Kawasaki-KX-125-KX250-Service-Manual-2003-2004-2005-2006-2007-2008.pdf
OEM Parts for Kawasaki
2003 Kawasaki KX250 Owner Manual

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e


May 16, 2010 | 2003 kawasaki KX 250

2 Answers

What should the tire pressure be for trail/ pasture riding. just got the bike. tires look low


You can get better traction that way sometimes. I would set to factory specs unless riding in the goo

Aug 01, 2009 | 2004 kawasaki KX 250

5 Answers

I have a 2005 kx 250 2 stroke and it keeps eating plugs


NGK brand spark plug BR8ECMVX is the stock plug for the bike. The proper gas / oil mix is 32 to 1. That means 4 ounces of 2 stroke oil per gallon of gas. The posting was not clear as to just what the problem is. If you are burning up plugs there may be a air leak in the intake system making the bike run lean. A lean fuel mix runs hot.

Jun 24, 2009 | 2005 kawasaki KX 250

2 Answers

Pinging noise at high rpm


You could have fuel with to low of octane rating.

Jun 01, 2009 | 2003 kawasaki KDX 220 R

2 Answers

Foul plug


It seems your piston ring needs to be replaced since its worn out. i am saying so because of the way the bike is being used. Since its 2 stroke, engine oil from the sump is making its way int the firing chamber and depositing on your sparkplug. Therefore pay special attention to the last ring, thats the one which uses the oil for lubrication...........sodeep

May 04, 2009 | 2003 kawasaki KX 250

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