I have early memories of engines as I grew up on a farm with a Lister Start-o-matic chugging away over in the shed. It even had its own 'proper' engine room.
The engine I remember most clearly was the old Lister 'J' (1917) that drove the shearing gear (3 stand). It had a long exhaust which went out through the wall, so when shearing started at 5 am we kids could hear the old Lister from the house. I still have that engine, mounted on its massive sledge (a NZ fitting?). I still have the original water pump to return it to screen cooling one day. That was ditched in favour of a 44 gallon drum when the former rusted out.
I decided one day when quite young, to see if I could start the 2 stroke Brockhouse motor on the BMB 'Hoemate" - I wound the cord just as I had seen my Dad do it, gave it a feeble pull, and away she went. These little engines scream - it sounded to me like it was going to take off, so I turned and ran as fast as I could. I slipped over in my haste and as I scrambled to get up, the engine stopped - no doubt the fuel tap was shut off... One of brothers still has that machine.
Also still in the family, and like the other engines mentioned, older than me are, the Hayter mower with Mk15 Villiers, still an excellent mower, the Atco, which was meant for the tennis court, but struggled with NZ grass. There were a few other small engines, I know where they all are 40 odd years later.