Ok, hold on a minute, "presuming" was a soft way of asking so no issues.

Is the centreline of the spray bar the same as centreline of the crank? Please clarify

Old tank, so couldnt get it open. It is probably not in use for a couple of years or my instructor checked it before he gave me the plane. This is because, when both of us were struggling with the tuning, he never offered to change / check the tank. Very early in the course of the problem, I got a Dubro tank with the express objective of replacing the original. He didnt seem to keen to replace it. This dubro tank dosent fit in exactly so I didnt try too hard.

That reminds me, I have a very similar tank in my high winger. Will try it in my next attempt with the plane

Ameyam