an unlimited 460/660 coil will not solve that kick from the timing. at least it didn't with mine. mine i sold before i could change it but if i decided to keep it i would have advanced the timing further. all engine will have a sweet spot where they kick like a mule. some bigger pull start engines will damn near break your wrist if they fire back at ya like that. the way i found timing is the factory is close but if you retard it's usually for a negative in performance. if you advance past the spot where they kick hard, there will be a point that it will eventually not kick as hard, and without the power loss of retarding the timing. unless your timing is currently off stock for some other reason i would try advancing the timing a bit to see if the kick lessens enough to be managable.