Is it the rpm shown on the gauge cluster or tachometer? From my own experience a 1000 rpm idle is very low for any healthy running 600/800 ETEC.I don't have an etec and the sled I will reference is not a 16 but a 12. And that sled will only idle at about 1000 rpm when warm. FWIW
I took the 1200 rpm straight from the Shop Manual, and the 1200-1250 rpm from my own visual experience.For the etec 600, I took that straight out of the service manual.
For non-etecs, yes, 1200 to 1800 is normal. For example, the 2001 600's are 1500-1600 RPM, while the 500 is 1700.
If you have the service manual, it will be in the technical data. For carb'd machines, it is listed under the Carb Type section.