My Bukh 10hp handbook says nothing on starting procedure about throttle position. The person who sold me the boat said the throttle lever should be well forward. Any comments appreciated.
My Bukh 20hp is about the same age (1984) and starts with about quarter to half throttle, though a lot quicker to start if the "cold start" is used for 20 secs prior to turning the engine over.
Also, you will notice the usual steam emission from a Bukh exhaust - very normal.
If the weather is really cold, ie below 5C, then some help is needed as these simple Bukhs have no glowplug. I use a teaspoon of oil down the little hole for this purpose, the decompressor, and if all else fails, some coldstart. This has only been required twice in 3 years. The manual recommends using coldstart in cold weather