I wonder if people worry about those little noises too much. It seems that any engine make noises of some type that tend to make you wonder.
Just about every pickup truck V-8 (gas or diesel) nowadays makes some kind of mechanical ticking, or slight rattling at idle. (More noticeable in the much quieter gasoline models.)
I have no idea why they do this, but I have heard brand-new ones do this, and they don't sound any different when they get 300,000 km on them.
I have an Oldsmobile with the 3800V6 engine. These are known to be extremely durable and long lasting engines. When it was brand-new it had a "rattle" on the front bank. It now has over 500,000km on it, and it still has that "rattle" and it doesen't sound any different. My other Oldsmobile (same year and model) had the same "rattle" from brand-new, and it hasn't changed in 310,000km either.
My brother's Olds (one year older model) makes the same noises. Every 3800V6 we have heard from 1989 to 2003 model years has made this odd "rattle" sound!
My point is, that it hasn't seemed to hurt the engines, and it must be the nature of the beast, part of it's genetics. It doesn't matter what temp it's running at, and it doesn't matter what grade or brand of oil you use, they sound the same, always. Only change is
RPM's it's running at.
If they were going to blow-up, the engines should have done it hundreseds of thousands of miles ago.
...Why shouldn't the roadie's big, heavy V-Twin engine not be allowed to make some odd noises without huting itself once in a while?
How many roadie engines has anybody seen that blow-up? I would imagine that actual Roadie engine failures are pretty rare and unusual????
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I was just concerned that someone may try to associate the video with reality..and cause them worry.
Doc posted one the other day on a bike with 
