During a revision trip before my GFT I was asked to spin a C150. The aircraft of the day had very recently arrived at the flying organisation I was with and it had a reputation for markedly dropping a wing at the stall. I hadn't flown it before.
We entered the spin as per normal i.e. S&L, throttle closed and full pro spin controls applied but the aircraft rolled unusually rapidly on entry. As the spin stabilised the instructor asked if I noticed anything unusual.
I answered that a) we were inverted and b) the engine had just stopped!
He asked me to describe my recovery to which I answered "same as normal but control column fully back instead of the usual forwards movement?". He nodded, I did it and the aircraft came out of the spin.
The aircraft was grounded and a rigging check found different rigging angles on the wings.