Yes, only switch to synthetic after a few thousand miles -- between 2000 and 4000. Why? Regular oil allows the engine to break in better; you want to let everything get mated and worn in. Once all the internal parts settle into their fit, then synthetic is the way to go. It will keep the engine running cooler and provide better lubrication.
It is not true that synthetic oil will necessarily cause clutch slippage. Synthetic oils with anti-friction additives (made for cars) will cause this problem, but a proper synthetic oil with the right viscosity is good.
See:
http://www.performanceoiltechnology....etclutches.htm
and go about 2/3 down this page:
http://motorcycleinfo.calsci.com/Oils1.html