Question about 2000 KTM EXC 250
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Posted on Jan 02, 2017
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
It is normal for these bikes to use some oil. A typical, maintained 250 4 stroke will use a pint of oil or more in one day of riding - depending on a lot of variables, of course. Oil consumption on these four strokes is quite typical.
Posted on Dec 16, 2009
SOURCE: ktm output shaft oil seal
if you are lucky there is a clip behind the front sprocket remove both then pop the seal out drain gear box oil first though. if not which i think is most probable the engine will need splitting if you are good with spanners it is quite easy being a 2 stroke .in brief remove engine remove bore and carb in one lump remove sprocket gear lever split g-box .seal up push old seal out, from outside in, fit new then reverse prosses. a good manual will help.
Posted on Feb 13, 2010
Chances are that the prior owner pretty well stripped the case threads. The gray aspect of the oil is water emulsified in the oil. The two usual causes are a bad water pump seal or condensation in the gearbox. The metallic part is bothersome. Somewhere, something is wearing badly. The site below has two factory service manuals available for free download. One is 2003 the other doesn't say the year. Either should be able to answer recommended oil quantity and oil type. Consider changing filters also. Please rate my answer. Thanks!
Posted on Mar 27, 2011
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Apr 07, 2014 | 2005 KTM EXC 250
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Mar 27, 2011 | 2000 KTM EXC 250
change the transmission oil run the engine warm and set up the motorcycle
on a horizontal surface. Remove the oil drain screw and drain used oil
into a container. Clean the magnet of the oil drain screw and reinstall oil drain
screw with seal. Pour in 0.7 litres engine oil (e. g. Motorex Top Speed 4T
15W50), replace plug and check engine for leaks.
TRANSMISSION AND CLUTCH WILL BE SUBJECT TO EXCESSIVE WEAR AND TEAR,
IF YOU USE TOO LITTLE OR LOW GRADE OIL. USE ONLY HIGH-GRADE OIL (E. G.
MOTOREX TOP SPEED 4T 15W50).
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