Picked up the engine today, turns out its a 55hp.
Finished cleaning the tup up and refitted it to check the clearances, 0.009"- 0.011" with a feeler blade up the side, throughout the bore, top and bottom of the tup, without the guide wedge in place.
And the piston has 0.016".
Seems good for the 0.001" per inch rule.
Jason