I am driving a Gixxer 150, and the shifting is hard and does not improve. Is it safe to add Bell Hammer to the engine?

As for our engine oil additive, GIXXER 150 cannot be used because of the multi-disc wet clutch system.
As a suggestion, we recommend applying to clutch wire and shift linkage to improve shift feeling.
The easiest product to use is LS Bell Hammer Gold 100ml mini-spray.
Try oiling each plunger point, link and wire.