7. CYLINDER HEAD/VALVES MXU 300/250 Measure compressed force (valve spring) and installed length. Replace if out of specification. Standard: IN : 10.2011.84kg(at 18.05mm) EX : 19.1422.02kg(at 21.5mm) Measure the spring tilt. Replace if out of specification. Standard: IN : 0.8mm (0.032) EX : 1.07mm (0.0428) 7-12