Hey all,

I'm new to this subreddit and to motorcycling in general and I'm looking to buy a Ducati monster 695! I found one online and went to have a look, but the guy did mention that one of the o-rings behind the black part in the image below was leaking slightly..

When looking at the image, I'm talking about the black part with the 2 circular knobs right above the exhaust pipe.

I'm trying to figure out what it's called and how hard it'd be to fix. I have no clue what ring to order and how much I can work the price this guy asked for, because of this (hopefully small) issue.

Sorry for the beginner knowledge and 5-year old explanation, I'm far from a mechanic.

https://imgur.com/a/LxiDzLQ

EDIT: It does seem to be from the timing belt! Anyone know how hard it is to fix a leaking o-ring here?