My .61FX ran quite well with an APC 13x6...the Zingers put more load on an engine...a 14x6 Zinger...hmmm...

A 14x6 is quite a load for a .61, and will probably shorten the life of the connecting rod, among other things...but if you don't run it too lean...it should be ok for a while.

With the hot weather we've been having, I don't think I would do it...but it's your engine...(like I said, it might be ok for a while, but...? )