Break in.

You can try the RC nitro trick. If water just sits there, you're closer to 200°, maybe below it, very possible at idle. Water boiling away in about 5 seconds is near 220. 2-5 seconds is something between 250-220. When it boils INSTANTLY, sizzling away like eggs on a frying pan, youre surely over 250. Water boils closer to 230 but if you engine is at 230, the cooling head is a bit lower than that, hence a few seconds for all the heat to be actually absorbed.
 
You can try the RC nitro trick. If water just sits there, you're closer to 200°, maybe below it, very possible at idle. Water boiling away in about 5 seconds is near 220. 2-5 seconds is something between 250-220. When it boils INSTANTLY, sizzling away like eggs on a frying pan, youre surely over 250. Water boils closer to 230 but if you engine is at 230, the cooling head is a bit lower than that, hence a few seconds for all the heat to be actually absorbed.

What am i shooting for? Instantly?
 
With no temp gauge to measure, run it until it is hot to the touch, as hot as it would be as if you just got back from a ride.

If you worry about overheating, break it in at a little lower temp, but do 5 cycles.