I worked on those for over 7 years. They have a variety of common faults which don't often get seen to by owners. Check out:
1) The rubber mounting brackets on the top of the rear shock absorbers. They normally separate after about three years and cause a knocking as the strut moves up and down over bumps.
2) [On the carburetor models] Check the throttle body. The spindle which the throttle swivels on wears the alloy carburetor and allows air to leak into the carb causing uneven running and excessive fuel consumption. If so then the carb needs replacement. Check by spraying WD40 around the throttle body with engine running. You should hear a drop in engine performance and engine speed if damage has occured. (Don't do this on the move
3) [On injection models] With the engine running wriggle the wiring loom that runs on the top of the engine rocker cover. Wires would split in this loom and would cause injector failure. Simple fix, but the wires need to be lengthened and soldered with new ones.
4) Brake pipes near the fuel tank would corrode in salty British road conditions. Not to say they would fail as quickly in Taiwan, but check them anyway.
5) Front anti roll bar mountings. Prone to early wear and corrosion. May often corrode then break off.
6) Rocker cover gasket. Will perish and leak over time due to normal hot~cold conditions. Replace.
7) Early engines required manual adjustment of the valves, so check for engine top rattles which should indicate poor servicing.
8) Manual clutch plates usually lasted around 70,000miles.
The car overall was a brilliant and rare car, being just about the smallest 4WD available, which was its main advantage. Aside from its common and very expensive carburetor fault, it was very cheap to run and extremely reliable. Even with torn, snapped suspension components it would just go and go and it wasn't even apparent that it was a three cylinder. I never did have an opportunity to work on the engines as they were so reliable.
The ECVT (Electronically Controlled Variable Transmission) model was also reliable, but I did once get to replace a drive belt on one.
My advice is don't pay over 20~30 for this car in Taiwan as no dealer would. When looking for information online, search for "Subaru Justy"
Taiwan's conditions don't really demand the 4WD Tutto and so they generally tend to be just 2wheel drive. As they don't produce this car any more then I would recommend a Nissan March/Micra instead as the parts are cheaper and easier to come by. The Nissan is just as practical too in term of interior size and function and is more familiar to most mechanics.