Posts tagged Oil System

Oil Sight Tube for XR650R


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┬áteflon 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.

Oil Flow of the XR650R


The Honda XR650R is a dry sump motor just like all the other Honda XR’s. The majority of oil is stored in the oil tank above the motor. By having the oil tank high up it means that the oil pressure pump will always have a good stream of oil from which to pull. Oil is pulled (so to speak) by the pressure pump down through the oil strainer on the front of the frame. Oil is circulated through the top end of the motor, across the crank, and into the transmission. It is then sucked up out of the sump through a screen by the scavenging pump and pushed back up into the tank in the frame through the plumbing on the right side of the frame. It’s a very simple system which is reliable and simple to monitor.

Honda XR650R lubrication system and oil flow

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