As per my information there is no YAMAHA dealer operating in Pakistan... there is a one big misconception... people think of Dawood Yamaha Limited as Yamaha... actually they took license of producing very very few models of Yamaha's bikes long long ago in Pakistan and put Yamaha logo on it... and due to their stubbornness of not improving the standards and models/technology, YAMAHA canceled their contract with them and now they are not even allowed to put Yamaha logo on their bikes any more...
We can just pray that our manufacturers get some motivation and introduce new technology in the market...
And as far as the reduction of 2 stroke bikes because of pollution is concerned, it is not 100% true... internationally there are many 2 stroke bikes that are maintaining very good emission standards... the big reason is the publicity/media war against it by the 4 stroke manufacturers... and also who cares for environment in our government by the way...
The biggest example of a very successful 2 stroke is Aprilia RS 125... this is a 125 CC bike, which maintains Euro 3 standards and runs on track with a top speed of 220 KM/H... (H) and just for the reference, here is the image of that bike...