Yes i agree with Racer too... I just come to know by him about Bridge..
Well Bro many of Us Bought this Bike directly from 70cc to YBR.. Believe me on Fb Group 60% People don't even know the reserve either upward or downward... My bike don't take much time to shoot at 100kpmh easily it can touch 110kmph...
Mainly YBR Don't have better mechanics... Local mechanics ruining these bikes.. But it doesn't mean YBR don't have ability to touch higher speed at ones...
Currently People are facing many issues after first tunning and Japanese are very serious about these issues.. GTG day by day increasing by these Japanese even MD of Yamaha Mr. etto attending all...
In short this bike will need some time for best performance until mechanics will Get well trained...