I made this for a Sea Doo, but it would work for Yamahas as well as long as the hose off your crank case is 3/4".

I have it for sale on eBay but if anyone here on the board wants it, I'll sell it for $40 plus $15 for shipping. just drop me a PM. It's made of 1/32" stainless and has a drain valve and all so you don't have to disconnect it to drain it.