ORIGINAL: Dr Honda
BUT.... a long dive could kill the engine. Hummmmmmmmmm.
We usually fly the Kolibri powerd planes like this with only a large felt clunk. It's not a problem with the dive as most planes can't handle full power while going downwards and the ones who can have such a great G-load so that the fuel is in the back of the tank anyway (Swist for example)
Only have in mind that if you climb unlimited then just glide back down at 45degrees descent you might get a flame out. Else seldom any problems.