The NGK spark plug code for our XT225 is as follows: DR8EA where:
"D" = the thread diameter, D=12mm or .472 inch
"R" = construction type, R = Resistor
"8" = heat rating (varies from 2-11) where 2 = hot type and 11 = cold type. note: 7 and 9 are available if desired to change heat range.
"E" = Thread reach, E = 19mm or .75 inch grip
"A" = firing end construction, A = unique end
"I" = special plug type, I = Iridium style
The DR8EIX Iridium next to the DR8EA resistor type
Need to check gap. Yamaha recommends .020 inch to .030 inch. NGK recommends .024 inch. Iíll use .024 inch. Note: NGK does not recommend adjustment of gap beyond .008 of as delivered gap. Electrodes with not align properly.
use this tool to pry the ground electrode toward or away from the center electrode. Should feel slight drag at .024 inch gap when done.
New one right at .024 inch.
Will store new one for bike tool bag.
Keep it protected
[ July 31, 2006: Message edited by: klm4755 ]