The model K had its beginnings in 1914.  During that year F&J introduced a new line of 15, 20 and 25hp throttle governed kerosene engines.  The need for large sized kerosene engines had previously been filled by the adaptation of the Double Efficiency with a special kerosene burning attachment.  The new model K engines were designed from the start to burn kerosene, naphtha, motor spirits, distillate and other heavier low grade fuels.  At the same time F&J was also building the hit miss governed N Kerosene engine in sizes 2 1/2 to 12hp.  It was not until the end of 1916 that a smaller lineup of model K engines became available to replace the N Kerosene. 

    Based off the still popular model N and having also just undergone a re-rating the new smaller model K was built in 3, 5, 7, 9 and 12hp sizes.  They shared the majority of parts with the model N.  The 3hp received heavier flywheels while all sizes incorporated a new governor and mixer.  Like the previous N Kerosene the model K had a large mixer that doubled as a starting reservoir and two needle valves.  A different type of air heater was used and the air mixing manifold was done away with.  A new feature added was water injection to help prevent pre-ignition under load.  A few other new features included the addition of a dashpot to steady the throttle rod, an auxiliary air intake valve and  a dashpot for the intake valve on 9 and 12hp engines. 

    The new model K was aggressively advertised and became much more popular than the N Kerosene ever was.  Newer designs replaced the smaller sized model K however the larger engines were still available - the largest by special order - right up to 1933.  Altogether F&J made 17000 kerosene engines of all sizes with the vast majority being the model K.

3hp model K engine showing the new mixer and governor dashpot along with heavier flywheels.

3 and 5hp engines couple be ordered with an optional hand truck.

This head shot shows the revised air heater and water injection feed.

9 and 12hp engines also featured a compression release shown here behind the ignitor trip.

5-12hp sizes of the model K were available on sawrigs

These massive engines were introduced in 1914.  They featured a vertical governor, fuel pump and came standard with a magneto.

All 3 sizes of the large model K were available as team portable units.

The steady throttling governor made the model K ideal for electric lighting.

     3-12hp engines could be equipped with a fuel pump for an outside fuel source.  The starting reservoir now became and overflow mixer and the tank in the base was used for the supply of gasoline for starting.  Of course all engines could be run on straight gasoline only if desired.  Two styles of hopper covers were also available.  One just had a vent for steam to be piped outside while the second style incorporated a hand hole for easy filling and checking the water level.