Hi, ty for your replies
oldgitonabike, dont take this the wrong way, as we all know, moving parts wear, valve clearance affecting the valve timing,& overall running of the engine, opening/closing at wrong times, not allowing enough fuel/air into the cylinders, not purging the old gases, etc etc, so thought it would be an ideal time to check & adjust, sure you would have done it, or it would have been done on a major service,
thanks for your time to reply, much appreciated.
Les