I have a 1989 Gold Wing 1500 with 73,000 miles on it, on which one of the engine valves is starting to stick. When I start it up cold, it sometimes runs on 5 cylinders for a while, then the sticking valve frees up and it runs fine after that. I'm pretty sure it's a sticking valve because when running the starter I can hear the starter surge when it goes past the cylinder with the open valive. In general how much should it cost (i.e. how many hours should it take) to do a valve job on a 1500?