Checked the usual suspects online, and the only place that had a decent option was AutoZone. In fact, they had at least three usable options, of which this, to me, was the best, providing a clear means of measurement, a flexible line to better reach Thelonica's admittedly tortuous path to the oil-filler opening, and a means of opening and closing the oil-feed.
So: rode off to my dealer for a quart of the proper motor oil (after ogling a mint-condition Moto-Guzzi California Police Special parked outside, details in photo posting), then to AutoZone for the means of feeding said oil into the bike, then home to get it all done. (I'm off to Brooklyn again tomorrow for RevZilla Brooklyn's Grand Opening, so I wanted to get all the important stuff under-the wire.) The Measu-Funnel is pretty straightforward in operation, and nicely-done: you use the blue collar at the base of the container to open or close the flow of oil, keeping it closed to fill up with the desired quantity of oil; there are molded-in marks in increments of 100ml as a guide. The attached flexible hose has a removable cap (with a retainer so you can't lose it), and a spout which is easy to insert, even into the GTS HPE's crankcase opening. I started with approximately 150ml of Castrol Power 1, and after screwing the dipstick-cap back on and firing up the engine for half a minute, discovered the level was still on the low side, after waiting some 2-3 minutes for the oil to re-settle after shutting the engine off. I then added another 50ml and repeated the procedure: this time, after two minutes post-shutoff, the oil level was spot-on…but after some ten minutes, the sight-glass was a bit over two-thirds full. I decided to leave things as-is, since the sight-glass wasn't completely full (an absolute no-no), and therefore felt I was still in safe territory, albeit not by terribly much.
The bottom line here? It works, and is likely a better means than many another of filling a GTS HPE with oil without recreating your very own Exxon Valdez in your garage or driveway. Recommended.
⚠️ Last edited by amateriat on UTC; edited 2 times