Wednesday, November 25, 2020

Senspray carburetor



 First introduced in 1911, the Senspray was a carburetor built by Atco, better known for their lawnmowers. A far cry from the surface evaporators of the previous century, it featured a float-fed fuel supply which was drawn up through a jet into the vapourizer tube in the center of the main air passage, giving good atomization. The vapourizer tube can be adjusted with a knob in the airhorn to expose more or less holes for fuel to spray into the mixing chamber.  The rotary throttle valve with an integral adjustable air valve is controlled by two levers on the handlebar, allowing the rider to refine the speed and mixture while riding. 
Although it seems to be quite fiddly, considering the rider would also be adjusting the spark timing while on the move,  the carb worked quite well and could be adjusted to give both good power and fuel economy.

Pdf of manual at Old mower club







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