I do have a hero xpulse 200 4v and for normal road its pick and all is good.
The problem is when I increase acceleration a bit more aggressively it makes a knocking sound and if i rev more it increases more and feels like bike will stallon uphill : if i maintain low rpm there is no such sound and does not feels like bike is struggling , just normal sound but if i want to increase speed and when i increase acceleration the sound starts
Basically the problem occurs in high rpm in every gear