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There are different Magnum 46's depending on their age but the tuning is pretty much the same

You need to tell us what you have on hand for running the engine so we can discuss all the aspects and sort of find out how much you already know about these engines

Here is the manual for the current XLS 46 series [link=http://media.hobbypeople.net/manual/210756.pdf]Magnum XLS 46 manual[/link]