I have a hensim 2008 150cc quad which is probably very similar to yours. Below is the wiring diagram of mine (I had to trace the whole thing out from scratch).
Note that this uses an AC powered CDI. Your 2007 probably uses an AC powered version also, though it is remotely possible that you have a DC powered CDI. A DC powered CDI is wired quite a bit different. On your stator output wire bundle look for a black wire with a red stripe that ties into the wiring harness. That is a strong indicator that you have an AC powered ignition system.