Thank you for your advices,
I bought 2005 Monster 620 Dark on private sales.
I love my Duc which I called Toma.
Previous owner was first owner. But she didn't ride as much.
2005 but it has almost 600miles.
I took Toma to Shop for first maintenance service.
Oil filter had some problem, but they fixed it for free.
I would love to ride with other Duc~!
I need to learn. ^^;