What do you mean like a hit? If its a knocking sound from the front of the engine then its probly the big ends or mains....
It could be piston slap aswell or a shims not be replaced somewhere.
Can you tell what part of the engine it comes from? I doubt it would be the clutch.
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Honda nc23 CBR400 AERO 1986, 1990 honda NC23 Tri-Arm, 1987VFR400 NC24 Rothmans Rep, NSR250 MC16 1987, CL250s 1983. Moto guzzi zigolo 110cc 1958. Fantic 50cc 1972. Suzuki Cobra Race bike 500cc 2t 1975 , GP125 1975. Triumph T110 1954. BSA Thunderbird 1955. Ariel VB 600 1952, 1990 MuZ 125 etz.