Yamaha 25BMH 30HMH Factory Service Manual, Page 224Get this manual

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INTAKE MANIFOLD AND REED VALVES
3 Measure: Valve stopper height Out of specification ReplaceValve stopper height 25B: 1.72.3 mm (0.0670.091 in) 30H: 4.55.1 mm (0.1770.201 in)

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