I concur PDR,
Suction is at manifold gauge showing increasing throttle opening till at 950 mbar and above it's Full throttle (WOT is a well known short-hand for that).
I couldn't see what the power actually was, but converting from 0.45 lb fuel per h.p. gives approx 97.6 h.p.
Could be the new bigger Rotax, except it's unlike their usual graphs (for the 912 series).
One of the flat four Belgian motors ('D' or ....?)
mike hallam