The search function seems to be back to normal!!!!! 2000 YZ. Is it new? I do not think so. Just the top and bottom ends. You do not need to get radical as a new bike break in. The heat cycles are very good. Heat cycle is letting the radiators get warm to the touch, bring the engine to normal operating temperature. Then let it completely cool down. Repeat. New I would do it on the stand twice, 2 short rides, 2 longer rides and done. Top and bottom end, less, once on the stand and 1 short and long each. Go over your bike while waiting, check the plug, coolant and oil level. Do you have fresh reeds and packing? Ratio about 32:1 or richer? Good pipe(no dents), clean also? Change the oil after break in, and every couple hours, if not sooner. If the main is correct, its broke in when it cleanly accelerates to the top. Too tight still, its like riding with brakes on nearly! Some of this opinion does depend on your particular ability riding and maintenance habits. Vintage Bob