16 KTM 125 help

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5/10/2018 4:19 AM

I bought one used to play around on. I put a new FMF pipe on it since the stock one was dented.
When I put it on I noticed it didn't fit very snug into the cylinder.
After I rode it I noticed oil leaking out around the o ring and running down the pipe.

Any advice on a easy fix, short of buying a new cylinder?

Thanks in advance!


5/10/2018 5:06 AM

Did you put new orings and crush washer on it?


5/10/2018 5:31 AM

kb228 wrote:

Did you put new orings and crush washer on it?

The new pipe had a new o ring on it. Not sure on the washer?


5/10/2018 5:36 AM

Crush washer? For a pipe? I'm confused.

New O-rings, for sure.

Check the intermediate flange. It is a replacement part on 2-stroke KTMs. It is the flange where the pipe meets the case. Held on by 4 bolts I believe.


5/10/2018 7:40 AM

Sometimes I need to loosen the mounting tabs on the frame. Then get the pipe to fit in there right then retighten the tabs.

My FMF doesn’t fit great and does get some spluge. Not a ton though.