xtz 660 ? to buy or not o buy

hi lads

im supposed to be picking up an xtz 660 1992 later on today

but before i commit is there any real probs

apart from the cdi is missing off the one i am getting its in good nick and was running its bin lying up fer a yr and the black box is in the wind

from the checking iv been doing the tdm will fit it but affects the bottom end ?

is the cdi a common problem ? seems to be a lot written about the cdi ?and are the 660 and 750s part common to each other i know my way around a bike but its my first tenere and im not arrogant enought to pretend i know it all so any help appreciated also if any one has a pulsar coil or knows were i can get good second hand or even a new set please post

local yamaha want 500 euro for a cdi?????

looks likethe buy is on hold for a week gives me a chance to check the marque out any feed back welcome