I came across a malfunctioning YPVS unit the other day, that had some bizarre settings for the exhaust valves curve. I asked the owner Ian (OZ) for some info on the bike and it seems to be a pre production prototype bike with frame-engine numbered #5. There is some very interesting history behind this bike and I have included some words from Ian himself, at the bottom of this post. Here are the YPVS settings for any RZ/RD500 owners that want to give it a try. It seem to be a little bit aggressive curve for road use with the power valves closing really early. Click on thumbnail for a larger image. A few words from Ian(OZ) about this bike : Hi Nick the bike is a pre production prototype eng no . 5 and frame no 5. It was flown into australia in march 1984 i raced along side it in the firstever time a rz 500 was raced. I think it was raced in australia as a pre cursor to the castrol 6 hour race won that year by mike dowson he beet the world champion wayne gardner who wa...