Yamaha 25BMH 30HMH Factory Service Manual, Page 230Get this manual

Yamaha 25BMH 30HMH Factory Service Manual, Page 230

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CYLINDER HEAD
2 Measure: Valve opening temperature Valve lift Out of specification ReplaceWater temperature 52 Below 48 52C (118 126F) 60 Above 60C 40 (140F) lif Valve lift mm (0 in) Min3 mm (0.