Co2
 

I am about to have a go at tuning my st2. Having read up on the fuel injection system on Sigma's web site and FIM's I have borrowed a vacuum gauge set and a Co2 tester. What is the correct Co2 setting when the bikes left the factory ?
Any tip's before I get going ?

Thanks

You need to be able to measure CO and Lambda as well to do it right.

It's the CO you need to measure, not Co2. Carbon monoxide vs. Carbon Dioxide.
The setting from the factory is a very "green" <1.5%, for best performance you'll want about 4% - 4.5%.
Make sure you measure from the take off points in the header pipes, as taking a sample from the end cans, from experience, tends to cloud the readings.