How do you adjust valves on a 250?

Answer 1

To adjust the valves on a 250cc engine, first, ensure the engine is cool and remove any necessary covers to access the valves. Rotate the engine to top dead center (TDC) on the compression stroke for the cylinder you’re adjusting. Use a feeler gauge to measure the gap between the valve stem and the rocker arm; adjust the gap by loosening the lock nut and turning the adjustment screw until the proper clearance is achieved, then retighten the lock nut. Repeat for all valves as specified in the engine's service manual.