Wayne is right on this one. The Sears brand was named the Economy engine and was painted bright red enamel while the Hercules engines were painted green. Both engines were made in the same factory in Evansville, Indiana. Look for evidence of either green or red paint to identify the different brands.
The engines were governed by speed which held the exhaust valve open once the specific speed was achieved. Under load of the saw blade the engine would fire continuously and then once the load was removed it would start to run in a "Hit & Miss" manner.
Prices on these would be very high for a complete engine and truck with the saw attachment. Hit and miss engines in that H.P. range alone can run into $1000's of dollars to the right collector.
Try going to an antique engine site and ask for pricing there.
Back in the day the saw attachment sold for $24 and the blade was another $6.
The engine 'truck' rails for the Hercules and Economy products were distinct in that they had a dropped senter rail rather than the straight rails used by other manufacturers. The underslung trucks dropped the center of gravity and put the engine into a more servicable position to operate. The trucks were for the 5, 7, 9 and 12 horsepower engines.
This engine looks to be missing the Webster Tri-Polar oscillating magneto that was standard equipment on the 9 and 12 horsepower units but an option on the 1-1/2, 2-1/2, 5 & 7 horsepower models.
It is probably a 1916 model and the prices for those back in the day were: $32.95 = 1-1/2 H.P., $46.75 = 2-1/2 H.P., $78.45 = 5 H.P., $106.50 = 7 H.P., $141.00 = 9 H.P., $196.50 = 12 H.P.
The engines used a Lunkenheimer carburetor with two separate needle valves, one for gasoline starting and the other for kerosene running.
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