Valve cleaning process:
Soak
Scrub
Result
Quick inspection of seats seems that they're all A-OK albeit looking a bit tired
Before cleaning
Brass wire brushed seat prior to lapping
Lapping compound
Lapping commences
Course lap
Fine lap
Comparison
Stem seals replaced with new OEM replacements and reassembled
Measured the head/valves and everything came up 0.002mm within factory new clearances which surprised me quite a bit considering the lack of servicing the motor has had. Thanks to Honda for making my life a little bit easier.
