I guess I have the only RE that leaks oil, just my luck.
Royal Enfield has a long and proud history of leaking oil.
You have the twin to my ride TW, right? I am taken mine in to Rons this weekend for some minor adjustments and her first oil change. If'n you want I can let him know bout you sight glass leak.
This is going to BE a problem if not addressed. The sight glass pushes into the case from the OUTSIDE and has no mechanical fixture to hold it there, other than a little friction on the rubber sealing ring. Any oil that gets past it is going to wet the seal and make it MORE prone to removing itself under the slightest crankcase pressure. I sent one flying across the room with 8psig as a test ... I made the suggestion that the sight glass should have an e-clip or a circlip or SOME sort of mechanical fixture to it .... but I guess a dozen or so "hard" improvements were enough. I'd take the thing to a machine shop and have a groove cut around the inside of the sight glass hole to allow mechanical fixing of the thing. That way, if it DOES leak - it isn't going to pop out and toss all the oil all at once .......
Jesus H. Christ, Bob, you really know how to scare a guy. Mine's not leaking at all and now I want to fix it!