The Older Gentleman says...[QUOTE] Because the very first Zed Thirteens had a slight reputation for blowing their bottom ends in spectacular fashion. Kawasaki's recommended fix was to increase the amount of oil in the lump by a litre or two. At least, that's how I remember it from the time. Lozzo may be able to confirm.[/QUOTE] Can't remember tbh. I gave up on anything to do with Z13s after I failed miserably got get one off the centrestand while working p/t for the local Kawasaki dealers.