That's a nice cruiser, welcome to the forum. I've the same engine but in a 90 series, no engine trouble.
Is there a thread or a sticky on this forum that explains or lists all the different variations of the 120 series, from 2003 - 2010 particularly for the Ireland / Uk models. I never knew the 1KZ-TE was in the early 120's. When was the change over? Are the manual gearboxes in the 1KZ 120's 5 speed or 6 speed? I seen some of them advertised as 5 speed, is it the same 5 speed from the 90 series with the 1KZ?