It was quite reliable despite having only one liquid-cooled engine.
For many the Porsche-designed liquid-cooled engine is not a true Harley.
The bikes are the same, powered by 15bhp liquid-cooled four-stroke engines, and the R in particular has genuine off-road ability.
Airplanes, with new liquid-cooled engines better than any possessed abroad.
The success of both airplanes was attributed to the slender lines of the high powered liquid-cooled engine.
In each step, the liquid-cooled engine has half the temperature difference and so at first appears to need twice the cooling area.
Air-cooled and liquid-cooled engines are both used commonly.
It is difficult to make generalizations about air-cooled and liquid-cooled engines.
Eight other machines with the original liquid-cooled engine were sold to Poland.
In 2009 the marque was retained for a new range with 16-valve liquid-cooled engines.
