Hello there,
As far as I was aware the Yamaha DT was discontinued in 2007 instead Yamaha makes rhe WR series.
That looks like a cool looking bike though, would love to know more about it.
I take it you're in the Asian market, hence why this is still available. I didn't know that the bike was still being produced there.
I'd almost argue the bike's styling is closer to the 80's LC model vs the earlier 70's model, with the bike using an aircooled design over the liquid cooled variant.
Sorry I can't be much more help than that, still cool bike though!