I got this bike and noticed that the cable adjusters were all maxed out, to remove any slack. I took off the flywheel cover and when I lift the lifter arm it feels way too easy. It rides fine, but when I try to idle it never works, it stalls whenever its in neutral. I don't think the re-engages as it should when I release the clutch lever. Sometimes when I am in neutral it doesn't quite roll freely, while other times it does. What should I do?