they are bastards but i find its easier to use spanners then a socket set, take the footpegs off with a 12mm spanner and a 6mm allen key if im right (which is rare) and then theyre slightly easier to get to.
hmm, always works when i have to work on my mates dna.... we talking stock pipe? or aftermarket, if its stock try taking the pipe apart and then pulling the motor out a bit.
if its a 50 then you need an extention bar with a tapered end so that the socket 'wobbles' you can then get the right angle onit
this is one of the worst bikes ever designed to work on, i find that the best thing to use is a ratchet spanner with a flexy joint.
try a sparkplug ona 125 conversion.. nightmare. there fookin orible. but the pipe aint that hard if you look an have a decent rachet spanner as wobbely said (the more you pay the smaller they get)