Am not familiar with the HF brand of engines, but an alternative choice would be the Weichai engines. They are very good quality and perhaps the largest manufacturer of engines in
China. Smallest size is 20kW if I
recall. For the incredibly low cost you could keep an entire set of spares including an in-frame
rebuild kit and a spare
head. Distributors in
Europe (Abato stands firmly behind them) and one in the
USA.
Many are shipped to
India for the
fishing boats, although that is slowing down due to politics. We find them here in the Chinese heavy machinery.