They don't come with a manual, certainly not a specific Moki generated one. They're usually created by the importer/distributor, Just Engines in my case.
Use their website for info. Setting the high low needles isn't any different from any other engine, what is important is following the breaking in rutine.
Believe me that is a quest in its self... There isn't anything like it! Do it correctly and the engine will perform superbly.