Thanks guys, ill take up your offer to join the forum, really appreciate the comments!
I am very interested in the mk 1 villiers bike, and i will be onto that fairly pronto, expect a lot of questions!
Yes the adaption came after a long cup of tea, i didnt really want to butcher the ancient motor, but after i thought about it, they made millions, and im sure someone has done worse!
Unless you have the actual pulley or clutch off the mower to use, its almost impossible to machine a tapered boss or pulley because the taper is so slight, bear in mind i also tried using a colechester apprentice fitted with a taper cutter for doing slight tapers, the angle is around 1.95 degrees i think, which is rather annoying!
When i machined it i did not use much speed at all, probabley not even 300 rpm, it was very slow because i ddnt want the conrod to let go! and i think once you made the third cut the work hardening had gone and it made a nice finish, the end result was a shaft with the diameter of about 16.70 millimetres, perfect for a small pulley, also the thread is a villiers special, with a 9/16 size shaft and a strange pitch, so thats why i had to change it.
The springs are for my nissan sentra, which i will put on next week.
Thanks guys!