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Originally Posted by Duncan
'Pinking' by the description.
Most likely caused by either a weak mixture (pipes or air filter been changed?) preignition (get timing checked) or crappy low octane fuel (try Optimax instead)
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A fair guess from Duncan. Other things that have been mentioned on the forum in the past are (1) piston slap (piston/bore wear or just wrong spec parts fitted), and (2) the flywheel nut coming undone causing a rattle.
(1) Maybe more noticable when the motor is cold?
(2) Very serious - as the flywheel can shear the woodruff key and trash the crankshaft.
More of a long shot is crank or small end wear, although it would be unusual at 10K miles unless oil & filter changes or level has been badly neglected.