I'm running through a friends 1999 Monster 750 and trying to figure out why it's only running when the choke is on, and when the choke is on it revs to 6K. The carbs have been rebuilt, tank has fresh gas, no cracks in fuel or vacuum lines, and a new fuel filter. I did an oil change and found this little guy on the drain plug and I'm not sure what it goes to. It's too thin to be valve return spring related and the only other thing I received advice on is that it could be the neutral spring behind the clutch basket. I have an old spring off my 748 and the metal look to be different thicknesses. Any guess on what this belongs to and what else I can check? Not sure it this is at all related to the bike not idling and only running when the choke is on. Thanks in advance for the help and support.