I have a Toro LX426 riding mower with a Briggs and Stratton Intek Engine 331777 094682. it was running one day and stalled on me and wouldn't restart. it has a new 12v battery, solenoid, and I just put a new starter motor that was bad. i did a valve adjustment and put a new gasket on valve cover. engine started a little hard, but it started. smoke started coming out and the engine does not rev up high like before. i checked the valves again and they are loose again. i adjusted again according to the specs but the valves just loosen up again. Any thoughts on why it's not revving up like before, the smoke, and the valves not staying adjusted?
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