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KEY PART
NO. NO. DESCRIPTION
1 - - - - - - - - - Engine B&S Model No. 31P777
2 532 13 73-52 Muffler
9 532 19 43-19 Keeper Belt Engine
12 532 40 19-85 Pulley Engine
15 532 40 75-45 Tank Fuel
18 532 19 77-25 Cap Asm
20 532 41 17-24 Control Throttle/Choke
21 532 41 63-58 Screw #10 x 0.750 BOS Thread
28 532 13 70-40 Fuel Line
29 532 13 71-80 Spark Arrester Kit
37 532 12 34-87 Clamp Hose
42 810 04 07-00 Washer Lock 7/16
45 873 51 04-00 Nut Keps Hex 1/4-20 unc
69 532 16 52-91 Gasket
79 532 19 23-34 Screw Socket HD 5/16-18 x .75
81 532 14 84-56 Tube Drain Oil Easy
82 532 18 16-54 Plug Drain Oil
84 817 06 06-20 Screw 3/8-16 x 1-1/4
85 532 17 39-37 Bolt 7/16-20 x 4 x Gr. 5-1.5
90 817 00 06-16 Screw 3/8-16 x 1
96 819 09 14-16 Washer 9/32 x 7/8 x 16 Ga.
97 817 67 04-12 Screw 1/4-20 x 3/4
ENGINE POWER RATING INFORMATION
The gross power rating for individual gas engine models is labeled in accordance with SAE (Society of Automotive
Engineers) code J11940 (Small Engine Power & Torque Rating Procedure), and rating performance has been obtained
and corrected in accordance with SAE J1995 (Revision 2002-5). Actual gross engine power will be lower and is affect-
ed by, among other things, ambient operating conditions and engine-to-engine variability. Given both the wide array of
products on which engines are placed and the variety of environmental issues applicable to operating the equipment,
the gas engine will not develop the rated gross power when used in a given piece of power equipment (actual “on-site”
or net horsepower). This difference is due to a variety of factors including, but not limited to, accessories (air cleaner,
exhaust, charging, cooling, carburetor, fuel pump, etc.), application limitations, ambient operating conditions (tem-
perature, 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.
NOTE: All component dimensions given in U.S. inches
1 inch = 25.4 mm
For engine service and replacement parts, call the toll free
number for your engine manufacturer listed below:
Briggs & Stratton 1-800-233-3723
TRACTOR - - MODEL NO. PP18542 (96041013900), PRODUCT NO. 960 41 01-39
ENGINE
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