It is my first experience that driveshaft fell off in hard corners. Are ball joints all in good shape?
About engine it self i think that you need to start from cleaning and refurbishing carburetor, checking distributor (point, vacuum - do not know what kind of dizzy you have) , checking timing (and adjust it if necessary) setting valve clearance and then see how will car drive.
I recommend that you do it by yourself as that is only way to be sure that job is done (and not been scammed).
There is a lot information and doityourself topics here on this forum you can read and learn how to do all repairs mentioned before.
If you need any manuals, books, tech data you can all find it here, and you can always ask for it.
Send me your email and i can give you list of books that i have in pdf.
Will be glad to share them with you.
But unfortunately i think you are stuck with yourself and learning how to fix R4 on you own.
I hear you, I secretly wanted some issues with the car, for learning purposes... but this is taking the p**s too many to manage in this small brain of mine.
I've started reading the tips and tricks page, thanks for that; completely forgot it existed.
It is odd that the roll bar keeps popping out/splitting the bush.
I've had a genuine part fitted which is a lot softer, but even stationary I can see the pressure that's put on it. I'll have to remove the bar and see if it's straight/correct way around.
Thanks for the tips on the engine issue. I'm pretty sure it's just the timing, as the carb was replaced about 5 months ago for a new unit.
I'm going to start studying, but in the mean while I have I'm going to stop at a mechanic in Cali before leaving Colombia.
The reviews seem to good to believe; all from people doing the Pan America Highway.
I spotted the part you mentioned on a thread somewhere. Problem is, over here everyone seems to install it without the collar. I've asked many mechanics and a classic renault parts store here in cololmbia, they tell me it's fine and can't supply me one!... I'm sure it would help of course.
Just seems odd how it's done this multiply times on the same side, and I'm not cornering that hard either. I will try and find source said collars though.
The engine was pretty awesome at one point, plenty of torque - kept it in 4th anywhere over 25mph, pulled like a train.
. Just needs an adjustment i guess.