It's hard to explain, but there are two half pieces or collars that are cut at about a 45 degree angle. When you loosen it, they are supposed to free up and allow the shaft to move which is connected to a pivot on a spring and it put tensions on the chain. When you crack it loose, it's supposed to self-adjust and then when you tighten it, it should stay tight.
The chains and guides themselves wear out and sometimes a cam chain adjustment will not do the trick. The problem is that most people ride and ride and never maintain it, then people buy it and try to do stuff right and it doesn't react because everything is shot or worn out.....
Honda had numerous color codes from passion red to ?? but there were a few if you wanted it dead nuts. Rustoleum sunrise red (although not very durable) is a very good Honda red match.
All our government does is distract us while they steal from us, misspend our tax $ and ruin our country