Hi. I'm new to this, so apologies if this subject has been covered. I've just been given a 1986 RD125 frame, inc bars, forks, swing arm, wheels. No engine or panels. I'm hoping to restore the look off the RD with a modern engine, possibly 4 stroke, and clocks etc. First off, is this possible. Secondly, what engine options could I go for? Thanks in advance.