Oil site tubes are a popular modification that allow you to see at a quick glance what the oil level is. It involves drilling a couple holes in the oil tank and connecting them with a small tube.

Honda XR650R Oil Sight Tube

The kits are provided by Animal House, Barnums Pro, and Baja Designs. I think XR’s Only has them as well.

Or you can make your own. The fitting part number is SS-400-202 from Swagelok for stainless or B-400-2-2 for brass.

Quarter inch hose can be had from nearly any supplier. McMaster Carr, Grainer, even an auto parts store. You’ll also need the drill bit, a tap, and some teflon tape.

Empty your oil, drill a pilot hole, a slightly undersized hole and tap in small increments (to see where your fitting stops rotating) . Presurize the frame resevoir with a compressor or by having a friend blow on a hose duct taped to the oil fill port (this way most chips will fall outwards).

Lean the bike to the right and pour a little oil. It will drive some chips that stayed on the inside of the reservoir down towards the opening at the bottom.