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paul1351,
Make sure you make the adjustments with the motor hot or at least warm. If you do it cold, you will probably end up with a noisy tappet or two i.e. too much clearance - and/or worse, a tappet or two with too little clearance (worse because you can't hear them), which might be a cause of a burnt valve. Take your time and when you think you have finished, turn the engine again and re-check all clearances - you might be surprised.