That's exactly what it is.
They are remarkably light (something like 26 KG for the manual start version). Coil & point ignition, no deadman (unless it's been retro fitted by the previous owner)
The front panel has two uneccesary adjustments, presumably installed as they reckoned a lot of their sales were going to be towed between sea and canadian mountain lakes. - "lid on" adjustment of both idle and WOT mix. Totally uneccesary for UK markets. The plus side is you can remove the rod & knob (best so you donlt accidentally adjust them!) , blank one hole with a grommet, and use the other for the deadman switch... Should also warn you the Electric start version had a weird multiplug on the friont case. 20 odd years of looking and I;ve not found a loom socke to mate with it..... Not sure what the manual start version plug was like, but I'm giruessing you may have a similar issue, but the deadman switch as mentioned above can als obe replaced by a connector or wire grommet....
I did look at prop options, and from memory the choice was 9" or 10", although I may be thinking of the 4 of a similar vintage. Props are a bit more tricky to find, and the gearbox is axially split so is a b@st@rd to re- seal if it's been dismantled, so check the 'box oil and if milky make sure you have a reputable 'Rude workshop to hand!
That looks like a short shaft - and like all 'rudes of the time Long involved adding a space between the bottom of the leg & gearbox, along with longer driveshaft, gear actuator, water & exhaust pipes. Plenty lying in spares skips round the country.
Only issue we've had is the cam follower on the throttle the roller is held in place by an O-ring (!) needless to say it's worth replacing it annually......
Yeah, they are old tec, but when set up properly (i.e mixture controls not been fiddled with!) they are very reliable. That looks like a nice example.