Spark Plug for MERCURY outboard 110, 200, 350, 500M, 500S, 650S, 950, 1100

This listing is about one (1) NGK Spark Plug for the following MERCURY outboard engines, which replaces OEM Part #823 71 B:

• 9.8 hp - 110 (1967-1969)
  
• 20 hp - 200 (1967-1969)
  
• 35 hp - 350 (1967-1969)
  
• 50 hp - 500M (after 1967)
  
• 50 hp - 500S (after 1967)
  
• 65 hp - 650S (after 1967)
  
• 95 hp - 950 (after 1966)
  
• 110 hp - 1100 (after 1966)