RB26DETT , RB26 Spark Plugs

Stock Spark Plug for an RB26DETT

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.
o 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(HKS) 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.