Bhai to be honest i never cared to heatup engine before using my bike.
If you ask regarding heat coming from the engine then i can tell you from my experience that it's really impressive .
I used GS-150 for 60KM (speed 90KM/h-100KM/h) continues travel and felt a lot of heat on my feat (I use open shoes).
On same kind of travel(speed 90KM/h-100KM/h) YBR was really cool and did not throw heat on my feat.
Its rainy season and i want to share few points from my experience
1.YBR got really cheap mirrors , check mirror base(near screws) , it can get rust in no time. i had to remove mirrors and cleaned all paint. Then used fuel pipe(imported) pipe to cover whole mirror shaft.
2. Also check battery terminals , In my case one of the terminal was rusted , i applied minor diesel and cleaned it with cloth.
3. In my area roads are really bad and mud goes deep inside the airscoop /fuel tank . I have no idea how to clean that.
I want to remove Air scoops from fule tank any suggestions ???