2008 Suzuki LT-A400/F, LT-F400/F ATV Service Manual, Page 101Get this manual

2008 Suzuki LT-A400/F, LT-F400/F ATV Service Manual, Page 101

Engine Mechanical: Valve Stem Wear If valve stem is worn down to the limit, as Measured with micrometerwhere the clearance
length and also by the force required to compress themIf the spring length is less than the service limit or if the force
required to compress the spring does not fall within the specified range, replace the valve springSpecial tool0990020101
(Vernier calipers (115 mm, 150 mm)) Valve spring free length (IN& EX Service limit: 40.9 mm (1.61 in) Valve spring tension
(IN& EX Approx196 (20.0 kgf, 44.1 lbs) at length 31.5 mm (1.24 in) I827H1140064-01 Valve Stem End Condition Inspect the valve
stem end face for pitting and wearIf pitting or wear of the stem end face are present, the valve stem end may be resurfaced,
providing that the length "A" will not be reduced to less than the service limitIf this length becomes less than the service