My gsf1200s in 1st gear has lost a lot of power. It's only in 1st gear but what happens is that when I first got the bike it would do power wheelies all day long now it spudders and is really jerky. At first I thought it was just a fuel filter but why would it only do it in 1st gear? If I take off in 2nd the bike is fine. Does anybody have any idea what this could be? I've also have a minor oils leak from the very top of the motor, but I know that's a common thing with air cooled bike if its just a small amount.