Not familiar with the Fast system in particular, but with other brands that I've used you still need to tell the system what A/F ratio you want to see under 4-5 load conditions. it will self tune from there, but needs the basic information to get things started. most will have those A/F ratios set very rich to begin with, so if you decide to start the engine before setting it up correctly you won't blow it up lean. ck your Fast owners manual. if you don't have one I suspect it's downloadable on-line.

Russ