MOPED ARMY

Idle is not going to change your compression/vacuum ratio. A leak is a leak regardless of RMPs. Your head gasket is usually a "special" gasket and usually fairly indestructible. It often needs to be a specific material to transfer the heat from the cylinder to the head properly. Put if back in if its not destroyed. The base gasket needs to be replaced EVERY time you pull the cylinder. Also, the mating surfaces need to be thoroughly cleaned. The base gasket often leaves pieces behind. They need to be cleaned off without scratching the mating surfaces. Also, make sure to torque the cylinder and head back down to the manufacturer's recommended ft/lbs.

Keep an eye on those head bolts. They can loosen up over time. Heat cycling will cause them to be loose after a fresh rebuild so you may have them get loose on you again. Head bolts, intake, and exhaust bolts are all things that should be double checked before a ride. I may not check them on every run around the block, but I will always spend 10-15min before a big ride making sure everything is tight as it should be. I just had a shock nut vibrate off the bike recently, thankfully while stationary and going over things anyway. Mopeds are fun like that.