Ferris IS2000Z Series Operator's Manual page 45

Specifications
†Power Ratings: All power levels are stated gross horsepower per
SAE J2723 as rated by Kawasaki and tested per the SAE J1995
test standard. The gross power curves and more information can be
viewed at www.kawasaki-criticalpower.com.
*Power Ratings: The gross power rating for individual gas engine
models is labeled in accordance with SAE (Society of Automotive
Engineers) code J1940 (Small Engine Power & Torque Rating
Procedure), and rating performance has been obtained and
corrected in accordance with SAE J1995 (Revision 2002-05).
Torque values are derived at 3060 RPM; horsepower values are
derived at 3600 RPM. The gross power curves can be viewed at
www.BRIGGSandSTRATTON.COM. Net power values are taken
with exhaust and air cleaner installed whereas gross power values
are collected without these attachments. Actual gross engine power
will be higher than net engine power and is affected by, among
other things, ambient operating conditions and engine-to-engine
variability. Given the wide array of products on which engines are
placed, the gas engine may not develop the rated gross power
when used in a given piece of power equipment. This difference is
due to a variety of factors including, but not limited to, the variety
of engine components (air cleaner, exhaust, charging, cooling,
carburetor, fuel pump, etc.), application limitations, ambient
operating conditions (temperature, humidity, altitude), and engine-
to-engine variability. Due to manufacturing and capacity limitations,
Briggs & Stratton may substitute an engine of higher rated power
for this Series engine.
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