Even though the adjustment is in the cover the engine has to be in time to set the valves. On the 250 there is a plug on the crank case cover. Marks are hard to see on flywheel so you have to look very carefully. Line the mark up with cut slot in threads plus screws into. An easier way is to bring piston all the way up to TDC. Pull valve cover and make sure cam is lined up as previously posted. If not either piston is not at TDC or timing chain jumped. I have seen tensioners go bad causing timing to jump. With cover on loosen 6mm adjusting bolts and move adjuster until resistance is felt than back off 1 mark. As stated above, make sure you have spark. Pull plug, connected to wire ground body of plug to cover and crank engine. Spark should be a bright blue.
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