My son has a ZXR400H1 which needs a bit of work. Does anyone know the front fork oil capacity and also where I can locate an air filter. Even a Kawasaki dealer cannot find a filter for the h1, only the h2 and l's. Maybe they are the same? Cheers.

according to the manual, 94mm plus or minus 2mm, from the top of tube, fully compressed,for oil. but suggest you ask on zxr world as lots of knowledgeable lads on there/..ted