Reply To: New problem and I can’t figure it out – Hyosung GV250
14 down from 16 would throw timings off yes and likely as Simon was saying that you may have hit something inside the engine, as there is a very small margin between the piston and the valves.
Like he also said, put some petrol or some liquid through the valves and see if they leak through without you pressing them down, it could be better than just visually looking at them. I would mention a likely hood of needing to replace the valve seals (if i didn’t say it before)
Rebuilding the front engine is a good idea to put fresh life in to the bike again.