Hi Hans ,
thanks for replying , the engine does have spark and will turn over ( at a good cranking speed ) both on the push button and on the kick starter. It still has spark with the alarm unplugged , and i have the fob , tried replacing its battery but still no good.
there is one wire which shorts out the CDI and stops the spark but ive left that unplugged so there is spark all the time.
its a wierd one , ive never had an engine which had fuel , compression and spark but still wont run???
Hence my theory, and only a theory , that somehow the CDI is delivering the spark too late , past TDC so therefore engine wont run.
with an analog multimeter im going to try and look for the AC pulse from the pickup coil , to see if it arrives at TDC . If it does then i'll try replacing the CDI with a generic one .