Another tip for metro enthusiasts is to check out Suzuki Racing Development.
suzukird dot com
Now these parts are high $$$ but if that doesn't bother you and you want some awesome mod parts or just want to drool a little LOL, they sell aluminum pulleys, flywheels, high compression piston set, and lots of other cool stuff that will make your metro better.
Back to that discussion on cam timing if you are not lucky enough to have the early cam sprocket or do but want more adjustability SuzukiRD also sells an adjustable cam sproket for the G10.
I was going to give you the link but apparently you have to have 15 posts before that is aloud
there site is easy enough to search though.