This is a combination of two posts from Phaedrus' website on FEED LINES and RETURN LINES.
Re-posted by permission. ~Joe
Installing the Cylinder Head Oil Cooling Return Lines
One of the main differences between the XR1200 and other Sportsters (or Harleys for that matter) is the oil cooling lines to the heads. These oil lines run up to the heads on the right (throttle body) side of the engine, and exit from the heads on the left (spark plug) side of the heads. The oil return lines need to be inserted into the heads as the heads are being lowered into place on the cylinders. The oil feed lines are installed after the head is torgued down. (And, it is easier to install the throttle body before the oil feed lines are attached.)
Prepping the Fittings
Re-posted by permission. ~Joe
Installing the Cylinder Head Oil Cooling Return Lines
One of the main differences between the XR1200 and other Sportsters (or Harleys for that matter) is the oil cooling lines to the heads. These oil lines run up to the heads on the right (throttle body) side of the engine, and exit from the heads on the left (spark plug) side of the heads. The oil return lines need to be inserted into the heads as the heads are being lowered into place on the cylinders. The oil feed lines are installed after the head is torgued down. (And, it is easier to install the throttle body before the oil feed lines are attached.)
Prepping the Fittings
The fittings for the oil return lines have o-rings inserted in a groove within the fittings. The o-rings are hard to see without a light, but they can be removed with a scribe or pointed tool, and replaced using a small pair of needle nosed pliers. I replaced these rings to help prevent later oil leaks at these fittings. These o-rings should be liberally oiled to let the oil lines slip into them without distorting or tearing them.
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