I'm assuming you mean the Stihl BR600, i've added a copy of the breakdown. http://www.mediafire.com/download/56zr9s967sf9a98
you need to access the top of the valves, they should both have an 8mm nit on them. this is the adjustment nut. you get to top dead centre, turn the flywheel by hand until the arrow on the outer of the face lines up with the top ignition module *****. Stihl tools have a feeler gauge you can buy to set them correctly, as normal feeler gauges are too wide to fit under the rocker arms correctly.
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