about tuning, if you are not one of patients look away! so many factors go into play with tuning, humidity, temperature, fuel, heat of plug, type of proformance desired. and almost every day you will have to tweak it, today i spent 15minuts starting the next, turns out that the problem was the low speed needle was too rich, and the the glow plug battery was low.
its mostly trial and error and listening to the condition.

but, you cant beat the sound of a well tuned engine.