Just picked these up in the last month. 1998 ATK 250 LQ and a 1973 Honda XR75.

The 250 and the XR75 are really clean. The XR75 I used to ride as a kid.

At this stage, it seems that the rust at the bottom of the fuel tank does not require treatment. However, I’ve noticed that it has spread over the past four months. I have been using 91 octane petrol and keeping the fuel tank completely full during this time. Should I treat the rust now to prevent it from spreading further?

The photos are from four months ago and yesterday, respectively.