Hi Bob,
You have a nice little Atco there. Given the clutch and the exhaust types present on your machine it would appear that your machine would have been built in 1952 or 1953. These machines have very little adjustment in the clutch. The 1952 manual says:
"The sole adjustment is very simple to make and is done by adjusting the pivot pin at the lower end of the clutch lever. This is adjusted by means of the two nuts, one on either side of the frame plate to which it is fixed. When in proper adjustment the operating lever should have approximately 1/2" of free movement in the gate at the top, before the pads are in close contact with the withdrawal collar on the clutch."
There is also a captive spring on the drive shaft behind the withdrawal collar. Make sure that the spring compresses and de-compresses as a sticky spring can stop the clutch from engaging properly.
If all of the above do not work you might need to clean the inside faces of the clutch to remove anything that might be stopping the clutch from engaging.
I hope that this info is of assistance.
Regards,
Sir_Chook
