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Collection, Preservation and Display of Old Lawn Mowers

Timing Marks atco commodore help

Can anybody please help me and my brother. We can't find the timing Marks on this atco commodore. I have posten some pictures. Can anyone point out where the timing Marks are ? 




wristpin Mon, 07/06/2021

Rotate the engine to get the piston to Top Dead Centre and fit the cam to leave both valves closed. Then take a really close look for any marks or a tooth with a chamfered edge .  If there really are not any clues, TDC or just past with the valves shut will be a good starting point.