Ignition in bad weather.
Clogged carburetor at all times (could also be the "high" quality Romanian petrol.
Bad engine sealing causing constant oil leaks.
Camshafts wear out incredibly fast due too bad design of lubrication system.
Very sensitive to carburettor and ignition setting especially in winter when consumption "rockets" to 20 liters/100.
Battery placement is faulty, risk of short-circuit.
Distributor's placement is faulty, risk of engine stop in heavy rain or small ponds.
And so on...
I bought the car while being student, for about 1200 dolars, and it sounded like a real bargain (the car was imported from Italy!!!).
The minute I started driving it, I constantly improved my mechanical skills.
Starting it up in winter was a nightmare and below -10 the spark plugs had to be removed and heated.
When driving this car you must be familiar with taking apart the carburettor as it needs constant cleaning and tuning. I did it with my eyes closed at least 5 times a year in spite the fact that all filters (both air and petrol) were replaced in time.
The combination air cooled engine and bad carburettor settings can quickly make you a poor man so watch out when taking the carburettor out for cleaning.
Another nice "feature" is the distributor's placement, low on the engine. It happened to me several times to get stuck in the middle of a pond when raining as the distributor's cap got flooded. Shoes and socks off...
Lubrication is very poorly designed causing the well known "motorcycle sound" when camshafts wear out. It is said that the lubrication "nozzles" get clogged preventing the oil circulation. I used high-quality oil and kept the inside of the engine cleaned and it still sounded like a motorcycle. Hint: if you use high quality oil try to use good quality gaskets for the valve caps. If you don't know where they are just follow the oil leaks.
The battery placement almost got me killed. The plastic cap on the positive pole fell off and the battery short-circuited on the hood while driving. I saw smoke coming from under the hood and hit the brakes. No brakes. Probably braking fluid lines went hot and fluid evaporated. I pulled the hand brake. No brake. The cable went hot, cut through the plastic and broke. I tried then to motor brake and when pressing the clutch, the clutch cable broke (must have been red hot). Luckily I had enough time to switch into second so eventually I stopped. Conclusion: Check that insulation as it may tear down due to vibrations.
The rear suspension arm have a funny design as they rotate on some kind of bearings. The sealing is very poor so mud and water will eventually kill those bearings, hence a screechy noise in the back. The sound may not bother you, but try correcting it as the rod will "chew" through the metal and in time the car will loose stability.
Perhaps I should say some good things as well. Let's try: good acceleration for a 1.1 liter, I could have used a 5 speed gearbox on it. Very good handling in any weather, never got stuck in snow or mud. Stiff "sporty" suspension, not exactly good for the streets in Bucharest, but perfect on the motorway at high speeds. Nice cargo room in the back when folding the seats.
What's left to say? I'll always remember it and cherish the memories we had together. I was young, you know...