There were a few water-cooled motorcycle engines in the veteran years, and a few with overhead valves. But so far as I know, there was only one which combined these two features.

Based on the F.E. Baker - built Precision motor, the Green Precision differs from most of its water-cooled brethren in that the radiators are attached directly onto the sides of the water jacket. In a typical installation, an additional water tank located up with the fuel tank keeps the radiators full, but does not contribute to the cooling effort.

At right is a 21st century facsimile of the color fold-out inside the cover of Volume 2 of Rankin Kennedy's The book of the Motor Car, published c1913.

The motor shown is the 3 1/2 hp (500 cc) version, but there was also a water-cooled 2 3/4 hp (350 cc), based on the air-cooled motor in my Bullock. In fact the only photo I have ever seen of a machine fitted with the 2 3/4 ohv Precision motor is a lovely Regal-Green-Precision that features in one of the Keig Collection volumes.

A few Green-Precision motorcycles came to Australia, and it seems that Vivian Lewis Ltd in Adelaide built a
3 1/2 hp Green-Precision-engined Lewis some time around 1914