when the few gap used between the cam and pus rod in valve arrangement this gap is call tappet clearance .This clearance use in between the cam and pus rod ,because reduce the noise.
Straight out of the original 1978 Manual: Intake Valve Clearance - Cold: 0.18mm or 0.007" Intake Valve Clearance - Hot: 0.20mm or 0.008" Exhaust Valve Clearance - Cold: 0.30mm or 0.012" Exhaust Valve...