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Special Tools Needed; Fitting to pressurize the cylinder. Good compressed air source. Proper Valve spring compressor. This can be done with the head on the engine. You will need a fitting to screw into the spark plug hole that you can apply a steady source of compressed air to hold the valve closed. Remove rocker. With valve spring compressor that clamps over the top of the spring cap and into a lower portion of the spring, Compress the spring until you can pry the two half moon keepers out. A magnet helps! Carefully lift the spring assembly off. Reassemble and compress the new spring and carefully slip it back into place. Carefully reinsert the valve keepers and release the compressor. Reinstall the rocker, check your manual, Usually about a half to one turn tighter after the slack is gone.
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