Stock

PFR6A-11

  • P = Premium platinum
  • F = 14, 19mm(3/4") reach, 16mm (5/8") hex
  • R = Resistor
  • 6 = Heat range 6
  • A = Firing end construction
  • -11 = 1.1mm gap (0.044")

Heat range for NGK plugs 2 HOT - 11 Cold

JIS length - 53.5 mm from seat to plug tip. STD GT-R plugs are JIS length.

ISO length - 50.5 mm from seat to plug tip

Racing NGK plugs. Recommended by Nismo

  • R7238-7, 8,9,10.
    • Replaced by R7436-7,8,9,10
      • Hand made fine wire racing plug
      • 14mm, 3/4 reach, 5/8 hex, JIS length , fine wire iridium center electrode

 

R7436-10 part number 4900 $ 38.81 each JIS - I like
R7116-10 part number 3179 $22.34 each ISO - I have used
R7119-10 $33.12 each ISO - Not used - should work
BKR8EIX $7.60 each ISO - Not used - should work
IFR8H-11 $11.71 each ISO - Not used - should work

 

NGK  Racing plug  4898  R7436-8  $41.52 
NGK  Racing plug  4899  R7436-9  $41.52 
NGK  Racing plug  4900  R7436-10  $41.52

 

The Denso plugs are not to be used. The ceramic around the electrode breaks off and drops into the combustion chamber under hard running. I have ruined several motors because of the Denso spark plug. I wouldn't use them in a Lawnmower.

http://www.sparkplugs.com/more_info.asp?AAIA=&pid=16890