Figure about 300-400° on the cylinder, especially around the exhaust port is about normal.
The best thing about these engines is the forced cooling--that blower is always running.
Make sure your cooling fins are clean and clear and make sure your oil is fairly new and not
too dirty. The dirtier and thicker it gets with age, the less it cools (and lubes) the engine.
I finally got one of those infrared thermometers with the laser on it too. Works a treat.