hello ive just bought a 2006 model yzf 250 and there is no spark at all. i have checked all the obvious things like kill switch, plug, ht lead and all the connections but its still not sparking. could anyone tell me what i should look for next and how to check the cdi unit and the coil etc to see if they are working properly because i dont want to go out and buy the bits and it still doesnt work. any help would be much apprechiated. thanks