I have a mate who owns a 1993 Kawasaki Vulcan 1500 V-twin.
He had the engine rebuilt recently, and since then he has noticed
a "pop" sound coming from the engine/exhaust when he turns the engine off.
(This happens when turned off at idle.)
He also says that sometimes it idles fast e.g. 1400 instead of 1000 rpm.
Can anyone help with this little one?