exhaust leak? on KTM - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 5 (permalink) Old 10-18-2009, 03:34 PM Thread Starter
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exhaust leak? on KTM

i got a KTM 250 EXC and where the pipe connects to the engine it has an oil leak. it doesnt look liek the exhaust is connected good or somethin. cuz when i start it up when its cold and it smokes, smoke comes out at this spot to. any ideas?

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post #2 of 5 (permalink) Old 10-19-2009, 07:28 PM
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Uh oh....what year is it? Also, always let the bike warm up completely before ridin' the chit out of it...

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post #3 of 5 (permalink) Old 10-19-2009, 07:42 PM
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First, make sure that it is not over-filled with engine oil. I remember that you said the bike was in good condition so I'm assuming the guy you traded with took good care of it....??? The only other thing I could think of is a sticking valve or bad rings.....but I would check the oil first...you may have just over filled it....

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post #4 of 5 (permalink) Old 10-22-2009, 08:14 PM Thread Starter
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yea teh guy i bought it from took better care of the bike then he does hsi self. i got a whole envelope full of service records that he gave me from the time he had it on. well i went to a ktm shop and he told me teh pipe springs was bad and i asked him if i should replace the O-rings on the exhaust and he tells me no that it doesnt have o rings, i go to take the exhaust off and find the O-rings. so the guy at the ktm dealership was stupid. andyways i put some chamber seal on it as a quick fix but i will buy new O-rings in a day or two. i think the pipe is also kinda tweaked a little cuz i can tget it to line up jsu tright

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post #5 of 5 (permalink) Old 11-27-2009, 04:04 PM
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This was common on Honda CR two strokes....its just pre mix oil...aft-power valve gunk. the Yamaha's have a tube for "blow off" the Honda's just leaked, and the KTM you have is probly doing the same thing. There should be, as you said, either an o-ring seal, or 3 pronged gasket that goes against the head/or into the tapered part of the pipe. Sometimes this fixes it, sometimes not...Just be sure you are running the proper oil/fuel mix. If its way rich, you will be seeing more of this "leak."

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