ok, I thought that the DRZ-S and DRZ-SM have the same compression than the Z.
Edited: I've just read that the S and SM model has 11,3:1, the same than Z400. The E model has 12,2:1.
So that, why the S and SM model need a colder plug? Should we use these colder spark plugs?
Exhaust: Pulse Charger (Stealth Charger version mounted).
Carb: Sparks FCR39.
Jetting: 158 main jet, 55 pilot jet, 1 1/2 turns out, needle on 3rd groove.
Intake: Pro Design Foam Pro-Flow kit, No lid, No snorkel, Outerwears lid cover, 4 extra airbox vents.