6 Th generation VFR low compression issues

[Mahi]

I decided to change the cam chains on my vfr , after chaining them perfection and then setting up the timing correctly as per manual , initially the front two cyclinders dint fire up , later I cleaned all sockets and few sensors sockets , then bike fired up all cylinders but then the compression seem to be a low on front cylinders, the bike was perfect before I decided the change the cam chains .... I need help thank you 

[HighSideNZ]

You need to recheck the cam timing.

Did you do the front bank first, then the rear, as outlined in the manual?