Have lost the key to my speedfight 100cc '03, have changed ignition barrel but still won't start. No spark. Does the immobiliser work on the key supplied and is there anyway round disconnecting or at least getting the bike to start?

Rob, March 2010

or you could keep your barrell and by the cdi bypass off me!

m, April 2010

oh dear your up shi* creek.yes the key has a transponder chip that send a signal to an ariel around the back of the ignition switch and that goes to the immobiliser/cdi unit and says yes its fine to spark im not being stolen!so if you dont have it i would buy an new ignition switch and then visist electrex world onlina and buy a new non chipped cdi unit.problem solved apart from your seat lock key.buy a new full lockset hey!

adam bike doctor, March 2010