I've got a couple of XR650R tanks that are just taking up space (bike was stolen a few years ago). 1. USED Acerbis 6.3 gallon that came with bike when I bought it. Not sure how old it is, but I used it on longer DS rides. No cracks or leaks, but it has scuffs. Comes with a cap, two newer petcocks (I replaced leaky originals). SOLD!!! 2. NEW Clarke 4.3 gallon tank, with new Clarke gas gap, new Clarke petcock and new vacuum fuel pump (to eliminate need to tip bike to use fuel from left side of tank) and mounts (for quicker swaps between tanks). $175 plus shipping from Boston. Payment via paypal.