Hi Grumpy thats the primer for the petrol for a cold start i dont know if its a flood button i usually push up and down a few times then pull the cord. in this picture you can see the bottom of the blue knob has a metal piece that touches the screw on the what i assumed was the kill wire. you are probably right about the wire going inside but as i said i cant see the end of it as it dissapears. what do you reckon about me taking off the flywheel and having a look ? any problems with me doing that ? you misunderstood me the contacts i meant were the ones that the side if the flywheel spin past i didnt open the magneto it is sealed. when i took off the cover to get to the pull cord/spring mechanism the spark plug cable fell out so i pushed it back in it has a tiny hole in the cable end and inside the magneto there is a tiny needle that pokes into the cable end to make contact. forgot to mention that yes the carbureter is attached to the primer
