What you say about this motorbicycle in the video????? http://www.youtube.com/watch?v=rQNMYDpY0K0 The person here use centrifugal motor kit in the bicycle with no pull start, he use the manual clutch to make the motor run. We can see it in "5.25" in video. Also we can see in this video at the begining the use of manual clutch http://www.youtube.com/watch?v=oMC9Nk9i_9g Now what to tell me?? Thanks a lot.