2007-2009 Suzuki LTZ90 factory service manual, Page 69Get this manual
If the seat width measured exceeds the standard value or seat width is not uniform, refuse the seat using the seat cutterValve seat width W: Standard: 0.9 1.1 mm (0.09 0.11 in)
If the valve seat is out of specification, correct the seat by servicing it as follows:
VALVE SEAT SERVICING The valve seats for both the intake valve and exhaust valve are machined to three different anglesThe seat contact surface is cut at 45
seat angle seat width valve diameter valve guide I.D