I ride a Yamaha Cygnus X Type 4. I am thinking of adding Bell Hammer to my engine oil and gear oil, but can I use Bell Hammer Seven for both? Or is it better to use Yamaha Special for both?

Bell Hammer Seven can be used as an additive to Cygnus X4 engine oil and gear oil without any problem.
The recommended additive amount is 5-10%.
Also, Yamanaka Special is more effective, but please be assured that there is no problem with Bell Hammer Seven.