Hi NormK and hi Converse, I would like to have warned this guy but the clip is from 2015. Probably blown up or worn out prematurely by now, unless he or the new owners realised this mistake early and found the missing shroud. Victa wouldn't include this part and the cost of making this major part just as a precaution. I admit, I really never thought of it's air direction before this thread and just assumed it was to stop the cover vibrating and prevent debris hitting the fan. Basically, this plastic part takes the role of the metal shroud on the old full cranks and is much cheaper to produce. Another clever production saving from the Powertorque engine. Is that top specific to the Tornado? I have fitted one to a regular base mower (shroud included of course!) and with regular shaft length engine with bent manifold. Updated its appearance well.
Ahh, if only victa had kept producing the thumblatch catcher series, they would be in better shape today!