Being an old rider but a new Venture guy, I've been reading every inch of this forum.
My new to me 2000 RSV with 30K on the clock had a pronounced whine/chirp thru most of the rpm/gear ranges.
Now I've only had this scoot for a couple of weeks and three hundred miles (hey work got in the way) and coming from an nice quiet Spirit 1100 this thing was loud.
I too was skeptical of the whole "oil additive" thing, but I figured that it was worth a try if it might put a gag in this thing.
Today stopped by Meijers and paid too much, $19 for 16 oz's, came home and drained the oil down 9 oz's (I changed the oil when I first brought it home and it was towards the top of the sight glass) and added 8 oz's of Motorkote.
I fired up the scoot and let it warm up while I got my gear on. Out on the road the difference was immediate. Almost no noise until 45 and even then cut at least by 1/2. If my whine/chirp was a 9, now it's a 3 or 4 maybe even a 2.
I only did 50 miles but if it stays like this I love this ride way more than I already did, and here's a strange kicker......I shut the bike down to move the wife's car so I could put the Venture back in the garage.
When I restarted it the starter spun like it had 24 volts going to it! Or maybe it spun like the motor had lost all compression.....hope not.
I know that it's way too early to make a good judgement on Motorkote, but WOW it sure seems to be doing something.