There isn't a solution for normal. Both your engines sound fine and perfectly normal. These things are noisy... just have to get used to them.

Sorry for hi-jacking your thread !!

When I go very slowly while in 1st and I depress the clutch to neutral, there would be a big "thud" sound like something is lose. WTF is that ?? is that normal ?? Need help guys, please comment

That's just how these engines sound. Nothing to worry about.

Very normal. There is slack in the drive train, so when you go from a loaded state to an unload state as you describe, you will get that sound as there is a "shock" to the system. It's totally normal.