well it would help if you say what you have done to the bike? has it always been doing this? did it start after you changed something? have you dissasembled it and cleaned everything out? what mods are on it?
Well if you or someone else don't start wrenching on the bike it will continue to look nice where it sits.
It's not a real complicated engine and you are in the right place if things happen to go wrong.
If you have a digital camera just take pics as you go so you will have something to refer to.
Go ahead and give it a try.
Did you clean your tank prior to starting the bike??