CBR900RR(X) carb sync.
I have 1999 CBR900RR. I just checked the valves, all in specs, and on my way to install new plugs and air filter.
To finalize the job I also plan to do to carb sync, and looked quickly to those Keihin carbs and i saw no clear places to attach carb sync gauges.
Forum search i found :
"There are 2 fittings already built in (#2 and #4). #2 is the vacuum line that connects to the petcock on the fuel tank. #4 is just capped and a bit hard to see. #1 and #3 have torx bolts in them.
Once you follow the vacuum line and disconnect it from #2, you'll have a better idea of where to find the others."
Really, this is a sound advice to find those locations?