I have the same problem with a Limited Edition Orange version that I have just bought. My original ARTF WOT 4 was sadly badly damaged when it failed to respond to elevator input (elevator not working at the time, it would appear). I have discovered that the captive nuts for the engine bearers have, for some reason, been set 5.5mm further apart than on my first WOT 4. Also, the bearers supplied allow no adjustment to the bearer spacing, which is fixed at 37.5mm, which is wider than any 40/46 engine I know of. My first WOT 4 had bearers which allowed for adjustment down to about 30mm.

I have contacted Ripmax about this and I am awaiting a reply and, hopefully, a solution to the problem. Before anyone suggests fixing a different mount and/or drilling new holes, how would one get blind nuts fixed to the back of the firewall of this model, when the only access to the back of the firewall is through the tank compartment?