Please what do you think about this engine noise?

[Bikeguy Joe]

I doubt it. I have bought several different vendors engine kits, and they all have done it.
Some more than others.

I have heard many engines on You Tube, and most of them do it too.

 

[2door]

I hear normal clutch sounds. Some engines are louder than others.

You might try just a small dab of grease on the gears inside the right hand cover. Don't over do it or the grease will get into the clutch and cause slipping. A dab of good quality bearing grease applied to the gears near where they mesh. Use only a dab about 1/2" in diameter and spread it around a bit.
Not saying it will change the noise you're hearing but those gears do need a little lubrication occasionally. If they're dry they'll be noisier than lubed gears.

Tom