I have been struggling to understand why the engine becomes quieter when the clutch is engaged. The sound becomes deeper and less "open". Bought the VBA, split the engine and changed everything from oil seals, to cylinder. It is almost like new beside the engine casing. With that said, I've no reference if this is normal or not.
If it is not normal, do you guys have any ideas why and what could be the cause? I like it when it's quieter so I would love to have that always and not just when the clutch is engaged
Any advice is helpful!