The black color you see is mostly carbon mixed with acid and it is abrasive as fine sandpaper and corrosive too. .
Yes, even on brand new Harley's. .
I do not recommend any other Sportster model than the 1200 Custom. .It is what trucos trampas tragamonedas riding a Harley is all about. .Going to Royal Purple's Website was so frustrating to negotiate to locate product and read the descriptions I backed out of the site. .The intake and exhaust valves must be adjusted and the engine must be lowered from the frame to gain access to the valve covers. .Generally it is dust on the belt that causes the noise so a little lubricant will quiet down the belt noise.Another problem of buying a new release bike is that you can't easily or cheaply find and install accessories.Open the gas cap and listen. .
Consider buying a new Harley before you dump a ton of money into an older bike that has few of the new features available. .Also, if you have a bearing or cam chain failure a lot of steel is sheared into the oil and goes to the crankshaft and rips the journal bearing to shreds. .You can gain a bit more lubrication and cooling too, but is the price (200) worth such small gains? .Even if it did you can fix the problem yourself or have a dealer fix it in no time at all at low cost to you. .Lead will work best and copper second due to their high density to absorb vibration energy. .I think if Harley had drilled water jacket passages they could solve heat problems they are having.Question: My Harley Softail started shutting off when downshifting coming to stop. .Make sure you ask if the product can be removed and reused or sold on the used market. .In fact, once you get a Dyno tune you can't change your pipes or you ruin the Dyno tune. .Every improvement H-D can make is just one less problem us riders need to endure.
Learn to fix your own bike. .
You should get 30,000 miles out of your front wheel rotors even with aggressive and abrasive racing brake pads and 45,000 miles with street sintered metal pads. .