HI all, I started general engine repair of my WR450, and need advice according a cylinder head. I has filled the head with liquid and there is no leakage. Only one valve has a little. The valve seats looks ok for me. The 4 valves looks not so bad Only one valve looks bad. It has a small fluid leakage The comparison between valves. I need your advice how to proceed, and save some money: 1. To buy one new intance valve and replace the damaged as is. 2. To buy all 5 valves and springs and replace them. When replacing do i need seat cutting/replacing or only to lapp with new valves? Those the Ti valves can be lapped? In manual was written "After refacing the valve seat or replacing the valve and valve guide, the valve seat and valve face should be lapped.", but some users sad that if lapped, life of Ti valve is shorted dramaticaly.