Did you not see my throttle body swap in this section?
So here are the iridium spark plugs the 5th and 6th gen use.
5th gen - CR9EHIX-9 (not standard)
C -
Thead Size - 10mm thread
R -
Construction - Resistor type
9 -
Heat Rating - 9 (lower = hotter, higher = colder)
EH -
Thread Reach - Partial thread
IX -
Thread Reach - high performance iridium
9 -
Wide Gap - 9 (.9mm)
6th gen - IMR9B-9H (standard iridium)
I -
Plug Type - Iridium Platnium
M -
Metal Shell Size - 10, 19mm (3/4") Reach, 16mm (5/8") hex
R -
Construction - Resistor
9 -
Heat Rating - 9
B -
Firing end construction - Special Design
9 -
Wide Gap - 9 (.9mm)
H -
Feature - only had A-D listed. H????
2009 GSXR 750 should be.
NGK CR9EIA-9
http://www.ngksparkplugs.ca/documents/partnumberkey.pdf