Question about 2004 KTM EXC 250 Racing
Good day, I just changed the oil in my 04 KTM 250 exc four stroke, and on the first start up it started leaking oil at the head/exhaust joint and burning it out the exhaust. IT's clearly oil smoke, as it smells like oil not the sweet smell of coolant. IS there a common cause for this? It didn't smoke at all before the oil change. I don't believe i overfilled it, the oil level window has a small gap at the top so its not jammed full.
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Posted on Jan 02, 2017
If you get the sevice manual or contact a dealer to get the correct oil amount for your bike, they need to know the model and year, you have to have the forks off the bike. take the fork caps off, take the springs out compress the upper fork tube all the way and add the specified oil. if they also give you the measured amount from the top that's the best way to get both fork oil levels exact. there is a special tool that you set the oil level in millimeters and it sucks out the oil to the right level, but before you do that step after adding the oil always pull and push on the cartage rod several times to remove air from the cartage tube. you will hear the air coming out and you will feel the changes in the cartage rod as the cartage tube fills up with oil and the air is removed.
something i'm confussed on though is if you replaced a seal you would have had to brake down the fork to replace it. you would have poored the oil into a container, cleaned all the internal parts,and used a fork seal driver to install the new seal. part of your question asks where do i put the oil in? thats in the open end of the fork after you have taken off the fork cap. It sounds to me like you only replaced the dust seal on one fork. that is not going to fix your leaking fork. you need to replace the oil seal thats pressed inside of the top fork tube.
Posted on Dec 26, 2008
SOURCE: Oil Leak at exhaust flange
No major problem. The proper mix is 32 to 1 gas and oil. That equals 4 ounces of 2 stroke ENGINE oil to one gallon of gas. Do not use MOTOR oil in the gas. 10w40 motor oil is what goes in the gearbox. Tighten the exhaust flange.
A top ranking please ... Thanks BJS!
Posted on Apr 25, 2009
SOURCE: 1995 KTM 250-EXC Buring Oil
you possibly have a bad seal on your crank. Its called a labyrinth seal and it will be on your clutch side because it is drawing in crankcase oil. the other side would make it run lean by drawing in air by the stator. if it is eating crankcase oil and not leaking it, it is most likely your problem. you can do a leakdown test on it to confirm the problem. put the piston at bottom dead center and compress the cylinder to about 10 pounds of air using a leakdown tester or a compression tester hose that can be used to hook up to an air compressor somehow and hold the pressure, but do not go above that because you could damage those seals with too much pressure. Check to see if the cylinder will hold the pressure for a good amount of time on its own. Check for air coming out of the crank vent hose or the oil fill hole. Also dont overlook the simple things like your premix ratio. try 42:1 or 50:1 ratios of gas to premix oil.
Posted on Jul 29, 2009
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