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These are the Engine Manifold nuts that I was talking about(all surrounded by red circles drawn by me in the pictures):
Nut 1:
Shown in picture 1 and 2. Picture 1 is the location, and picture 2 shows the nut that needs to be tightened. This was the most loose nut that I found in all the four nuts.
Nut 2:
Picture 3 shows the bolt of this nut. Its nut is hidden at the other side behind the front sprocket cover and cannot be accessed until the cover is removed.
Nut 3:
Picture 4 shows the location and picture 5 shows the close up of the nut.
Nut 4:
Can be seen if we bend down and look at the bike's underside..sorry, couldn't take a picture!
Note: Anybody see the pipe which's left open in Picture 1? It's within the green rectangle that I made. Does anybody know what it is for and why it's left static like that and not under usage?