I had the dealership(Tom Kerr Mazda) re adjust the tappets at 90k which i highly doubt they did and charged me for, but I cannot prove this, sound was still there. They blamed it on a loose fan belt. So i took it to a 3rd Party Mech he advised me that it was normal injector sound as you mentioned and its not hurting the motor. With my missus nagging me to get the sound fixed, desperately searched the net, and the nulon lifter free product came up and some videos on youtube with the same sound form the same motor. So tired the solution offered and it worked!
I agree with that intake setup of the stock jazz, it was a pain in the ass to replace a air filter. Very tight fit under the bonnet.
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