Question about 2004 kawasaki KX 125

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What is the stock gas oil mix? My bikes modified and i don't know what mix i should use cause my bike keeps getting a fouled spark plug-_-

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The standard mix is 4 ounces of two stroke engine oil per gallon of gas.

Posted on Feb 08, 2010

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Posted on Jan 02, 2017

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Why does my dirt bike keep fouling plugs


Hi, Joey assuming it's a 2 stroke 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 a fine mist of 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 in good condition.
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 please click on the blue links below. Good luck and have a wonderful day.
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Spark Plugs Keep Fouling
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fouling plug with 4 stroke what wrong ATVConnection com ATV Enthusiast...
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Jun 06, 2017 | Motorcycles

1 Answer

Plugs-keep-fouling-tried-3-different-plugs-what-can-i-do-to-solve-this-problem


What is causing the fouling? Engine oil? On a two cycle dirt bike, the fouling can be caused by excessive oil in fuel mix. I believe 50 to 1 is the correct ratio yet you may want to cut back, a little at a time, on the oil or run hotter fuel. The exhaust system will also accumulate enough oil sludge to impede the exhaust flow causing poor performance and plug fouling. A two cycle must breath freely to keep itself internally clean. Air cleaner to exhaust. Proper fuel mix should have little , very little. Good Luckand hopefully this helps you.

Dec 27, 2010 | 2003 Yamaha YZ 125

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

1 Answer

So i was wondering i changed the spark plug on my bike including all oils, also included a costume yamaha fuel filter bike started fine rode it. Than second time i started it i forgot to turn gas line...


hi, the problem is that your bike is running to rich( to much fuel from carb to engine) so its the un-burned fuel mix that your seeing on your plug and thats fouling it out......now this is caused by either to rich of fuel mixture(you should be mixing 32:1) or you need to rejet carb so it delivers less fuel to engine... your carb has a jet in it and the # is stamped on it ( if you take the carb off and remove the bowl( 4 screws) you will see it,it will have an octagon shaped head.) for example if the # on it is 55 then you need to go with a 53 or 54...... also a good sign you need to rejet with a smaller jet is your bike will spooge(leak) a black oily residue from exhaust pipe and muffler( same residue thats fouling the spark plug.)

Sep 27, 2010 | 2003 Yamaha YZ 125

1 Answer

Spark plug keeps oil fouling. What band of oil shoul use? Is 40:1 gas mix good? also wat spark plug? BR9ES, BR8EG, or R7376-9?


32 to 1 is the standard mix. That is 4 ounces two stroke ENGINE oil per gallon. The brand doesn't really matter. Don't use MOTOR oil in the gas. The stock plug is NGK brand, R6918B-9. I would suggest a hotter plug, R7376-8. The last digit is the heat range. The lower the number, the hotter the plug.

Feb 11, 2010 | 2004 kawasaki KX 125

2 Answers

Bike keeps fowling plugs could it be the


usually 2 strokes foul plugs when the oil is two strong in my old bike i mixed the gas 40:1 try that and if it dosent work i would take it to your nearest dealer and get them to check it out

Feb 08, 2010 | 2003 kawasaki KX 125

1 Answer

My yamaha yz 125 is dumping to much fuel and fouling out the plugs but i need to knoew how to adjust my carb its a 1997


There are only two adjustments to make on your carburetor; the idle speed, and the idle mixture adjustment. If the spark plug fouls frequently, first make sure you are using the correct spark plug. Your 1997 YZ125 uses an NGKB9EGV. Then be sure you are using the recommended two stroke oil, mixed to the proper ratio, in the fuel. Also make sure the air filter is not excessively soiled.
With all of the above confirmed and corrected, start the bike and run until the engine is up to normal temperature. Adjust the idle mixture screw to attain the fastest idle and best throttle response. Then adjust the idle speed.
If you are still fouling the spark plug, verify that the carburetor has the correct size jets by consulting your owner's manual. Keep in mind that if you are operating your bike at an altitude higher than about 6,000 feet above sea level, the stock jetting may be too rich. Down-size the main jet in small increments until satisfactory operation and the correct spark plug color is obtained.

Nov 02, 2009 | Yamaha YZ 125 Motorcycles

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

Dieying of the bike


Check the compression, I dont know what the manufacture calls for the gas oil mixture ,but that sounds too lean..

Jun 10, 2009 | 2008 KTM 250 SX

6 Answers

Kawasaki kx 250 fouls spark plug in 30 minutes


You definitely need to change the oil mixture to at least 40:1, use a good grade of 2 stroke oil. You do NOT need to return the bike. I'd highly recommend using an NGK B7EV spark plug. A hotter plug will stop the premature fouling. I would not recommend you decrease the oil to 50:1 because you are essentially robbing the engine from adequate oiling for the piston, KIPPS valves and the bearings. The hotter plug will make a huge difference but remember if he gets to the point where he is able to ride the bike to it's potential he will need to run the cooler plug, B8EV or B9EV. You can also use a cheaper plug in the same heat range, B7ES or B8ES. Those plugs should cost about $1.25 ea. and are an affordable cost of running the bike. It's not uncommon to replace a spark plug frequently, it's the nature of the 2 stroke engine.

Dec 08, 2008 | 2003 kawasaki KX 250

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