Question about 2008 KTM 450 EXC-R

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Crank engine crank case too full and gear case section empty of o

Drained the oil the other day on my 08 450 exc and found a piece of seal in the oil as well as metal, when i removed to fill plug oil came rushing out as if it was too full, however i fill to specs every time, noticed the gearbox section empty.
Was wondering if there is a common prob on this model.
Engine made a strange wine before hand however still goes hard.

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  • hcw_83 Jun 19, 2009

    I am a mechanic im well aware of that but cheers, however WHY is the oil leaving the gear section and over filling the crank case, i heard there is a seal behind the clutch basket that is faulty from factory. is this the cause you think.

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Running with no oil in the gearbox means all new bearings and seals and all new gears and possibly shafts. If you found metal in the oil, the entire engine is contaminated and will need to be rebuilt: Crank, top end and all else. Your engine is self destructing due to lack of oil. Yes, it still goes hard - - - but not for long. Sorry.

Posted on Jun 18, 2009

  • tombones Jun 19, 2009

    To my knowledge, the clutch and gearbox run in the same oil. No seal would be needed. More likely would be an oil pump seal or crank seal. KTM is not my specialty and I don't have access to a service manual or parts diagram. I normally work with Japan bikes. You had me scared when you mentioned no oil in the gearbox and metal in the crank oil. I am happy to find that you are a mechanic and not intimidated by an engine.



    So a bad seal is probably where the oil is getting into the crankcase, but WHY? The best I can come up with, from Dallas Texas, is that on the upstroke a vacuum is created sucking in the oil. Good piston rings are not letting much of any blow-by get into the crankcase which would tend to push oil out. The excess oil acts as a "seal" to keep all collected oil inside the crankcase. When you rebuild the engine, let me know what you find. KTM is a really well designed hybrid motorcycle.



    You used the word "cheers" in the reply. Are you in the UK? That's why I mentioned Dallas. Okay brother, I hope that my answer can be re-rated at least "Helpful" now. "Cheers!"

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Posted on Jan 02, 2017

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