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2007 KTM 450 XC Oil Leak

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My 2007 KTM 450 XC decided to be evil.  After the first ride after some maintenance, the rear of the bike was coated in oil. I cleaned the bike, did a full oil change and it still leaks.  The oil leaks out of the port featured in this internet photo:

 


 

The last things that I did to it was:

 

 - Remove the clutch cover, remove the clutch basket, drill holes in the clutch basket to allow for more oil flow to eliminate the 1st gear clutch chatter)

- replace the countershaft seals, o-rings and spacers.

 

When I replaced the countershaft parts, I may have overfilled the oil. 

 

I cannot find that port on any of the fiche. It doesn't appear to be threaded.

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My 07 450 EXC just started doing this same leak.  Cannot tell where it is coming from but coats the middle part of swingarm and shock spring.  Any progress?

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I think the hole you are referring to is a hole that is drilled to complete an oil passage during manufacturing and has a steel ball pushed in. JB weld it.

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