2009-2012 Honda MUV700 Big Red Service Manual, Page 239Get this manual
CYLINDER HEADNALVECAMSHAFT REFACING NOTE: Follow the refacer manufacturer's operating instructions Be careful not to grind the seat more than necessay
If the contact area is too high on the valve, the seat must be lowered using 32 flat cutterIf the contact area is too low on the valvethe seat must be raised using 60 interior cutter
CONTACT TOO LOW
Using 45 seat cutter, remove any roughness or irregularities from the seat