From inside (document excerpt):
ILLUSTRATED PARTS MANUAL Hydrostatic Lawn Tractor — Model Series 610 IMPORTANT READ SAFETY RULES AND INSTRUCTIONS CAREFULLY BEFORE OPERATION Warning: This unit is equipped with an internal combustion engine and should not be used on or near any unimproved forest-covered, brushcovered or grass-covered land unless the engine’s exhaust system is equipped with a spark arrester meeting applicable local or state laws (if any). If a spark arrester is used, it should be maintained in effective working order by the operator.
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In the State of California the above is required by law (Section 4442 of the California Public Resources Code). Other states may have similar laws. Federal laws apply on federal lands. A spark arrester for the muffler is available through your nearest engine authorized service dealer or contact the service department, P.O. Box 361131 Cleveland, Ohio 44136-0019. PRINTED IN U.S.A. MTD LLC, P.O. BOX 361131 CLEVELAND, OHIO 44136-0019 FORM NO. 769-02929 02/13/2007 Model Series 610 57 19 55 Models w/ manually adjusting seat Pivot Bar End Cap Pivot Bracket, Support RH Pivot Bracket, Support LH Pivot Bracket, Bar Steering Wheel Steering Wheel Cap Ref. No. Part No. 731-04040 731-04681 Description Steering Wheel Cap, Sprig Logo Steering Wheel Cap, Tine Logo Shoulder Bolt .
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Company Web Site: www.mtdproducts.com