Just got my GYTR Flywheel weight in, and was reading the instructions say to drain all the gas and remove the tank. It also says to unplug the CDI. Is all that necessary? I currently have a drained tank, and seen a video on YouTube where they just laid the bike an it's side, removed the cover, then the stock flywheel. After that just installed the new one, tighten it all up as per the manual, and off you go... is this not correct?