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Valves much more noisy after adjustment - Honda CX500, GL500, CX650, GL650

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This is almost certainly due to the valves being adjusted at TDC on the exhaust stroke, not the compression stroke - keeping in mind that the crankshaft is at TDC twice per 4-stroke cycle, one on the compression stroke and once on the exhaust stroke.

At this point it is worth re-doing the adjustment and ensuring that you are on the compression stroke - we'll link to the valve adjustment article which clearly outlines the procedure once that's complete.