Yamaha 25BMH 30HMH Factory Service Manual, Page 150Get this manual

GENERAL
3Check: Spark plug type Incorrect ReplaceStandard spark plug 25B: NGK BR7HS-10 30H: NGK BR8HS-10

4Measure: Spark plug gap Out of specification ReplaceSpark plug gap 0.9-1.0 mm (0.035-0.039 in)

• ATV
• Jet Ski
• Outboard Motors
• Personal Watercraft
• Snowmobiles
• Stern Drives