Depending on conditions, 200 - 270. Obviously 270 on a cool dry day is probably a sign of a pretty lean tune, where as 200 on a 100F+ day is probably a little rich. Temperature will vary greatly with oil content, track layout, it's so hard to say. My motor, when tuned well for race conditions on an average summer day in the midwest, tends to be around 220 - 240. On the hotter days, it will approach 260 - 270, and when I see it get close to those temps, I tend to richen the motor up and take away a little top end to be on the safe side, especially for club races. At a bigger event, I may still tune tight to top speed and leave it on the hot side.

I don't know about others, but I consider a motor broken in enough to race tune the moment the physical pinch is not noticeable with the motor warm and the plug out. Basically, immediately after each break-in tank, I immediately pop the plug out and try to turn the motor over by hand with my finger on the flywheel. Since the motor was just running, it will be up to temp, and a broken in motor will offer no resistance when the piston is at the top around the pinch when hot. Obviously leave the piston in the down position as it will close back around and lock the piston up as it cools otherwise.

Wayne