Briggs & Stratton PROFESSIONAL SERIES 120000 Repair Manual

POST OFFICE BOX 702MILWAUKEE, WI 53201 USA©2011 Briggs & Stratton CorporationBRIGGS&STRATTONCORPORATIONPart No. 279000 - 3/11 110000/120000 Pr

611WARNINGUnintentional sparking can result in fire or electrical shock.Unintentional start-up can result in entanglement, traumatic amputation, or se

811Oil ChangeChange oil after the first 5 hours of operation. After that, change oil after every 50 hours of operation. Change oil more often if engin

1011Cooling System Dirt or debris can restrict air flow and cause the engine to overheat, resulting in poor performance and reduced engine life. Conti

1211Top No-Load Adjustment1. Start engine and run at idle speed until it reaches operating temperature. 2. Place throttle lever (F, Figure 1-9) in FAS

1411Adjust Alternator Air Gap1. Remove spark plug. 2. Loosen alternator screws (A, Figure 1-13). and slide alternator (B) away from flywheel. 3. Tight

FORWARDThis manual was written to assist engine technicians and service personnel with the repair andmaintenance procedures for Briggs & Stratton®

1611Remove Flywheel Brake1. Disconnect and remove spring from brake anchor. (Standard brake assembly (A). Electric start brake assembly (B). 2. Discon

1812SYSTEMS CHECKMost complaints concerning engine operation can be classified as one or a combination of the following:• Will not start• Hard startin

2012ELECTRICAL SYSTEMSEquipment Used for TestingDigital MultimeterA digital multimeter is recommended for all electrical testing of Briggs & Strat

2212Starter Motor TestingBefore assuming an electric starter requires service, check the engine for freedom of rotation by removing the spark plug and

2412Not for Reproduction

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2613EXHAUST SYSTEMSome engines may be equipped with an exhaust system (muffler, bracket, and hardware) supplied by the equipment manufacturer. Contact

2813Not for Reproduction

3044FUEL TANKFigure 4 - 1Not for Reproduction

3244CARBURETORFigure 4 - 2Not for Reproduction

3444Not for Reproduction

3645GOVERNOR SYSTEMFigure 5 - 1Not for Reproduction

3845Install Governor SpringThe governor spring is assembled to the control lever tab and the lower hole of the carburetor throttle lever.Figure 5 - 2S

4066CYLINDER HEAD AND VALVESFigure 6 - 1Not for Reproduction

4266Not for Reproduction

4477ELECTRIC STARTERFigure 7 - 1Not for Reproduction

Not for Reproduction

4677REWIND STARTERFigure 7 - 2Not for Reproduction

4877Not for Reproduction

5048LUBRICATION SYSTEMFigure 8 - 1Not for Reproduction

5248Not for Reproduction

5449CYLINDER AND SUMPFigure 9 - 1Not for Reproduction

712345689101112SECTION 1 - Safety, Maintenance and AdjustmentsSECTION 2 - TroubleshootingSECTION 3 - Exhaust SystemsSECTION 5 - Governor SystemsSECTIO

5649Inspect Sump1. Remove oil seal and discard. 2. Visually inspect sump for cracks, stripped threads, and wear in bearing surfaces. If damage is foun

58410CRANKSHAFTFigure 10 - 1Not for Reproduction

60410Not for Reproduction

62411PISTONS, RINGS, AND CONNECTING RODSFigure 11 - 1Not for Reproduction

64411Check Ring End GapIt is recommended that the entire ring set be replaced when servicing the piston and/or cylinder bore. However, the original ri

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66411Not for Reproduction

6712SECTION 12 - ENGINE SPECIFICATIONSMODEL 110000 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

6812ENGINE SPECIFICATIONSMODEL 110000ENGINE SPECIFICATIONSArmature Air Gap .010 - .014 in. (.25 - .36 mm)Crankshaft End Play .002 - .038 in. (.05 - .

6912Standard Dimensions Reject DimensionsSAE Metric SAE MetricCYLINDERMag Bearing.876 in. 22.25 mm .878 in. 22.30 mmMag Oil Seal DepthFlush Flush N/

7012MODEL 120000ENGINE SPECIFICATIONSArmature Air Gap .010 - .014 in. (.25 - .36 mm)Crankshaft End Play .002 - .038 in. (.05 - .97 mm)Spark Plug Gap

7112Standard Dimensions Reject DimensionsSAE Metric SAE MetricCYLINDERMag Bearing.876 in. 22.25 mm .878 in. 22.30 mmMag Oil Seal DepthFlush Flush N/

7212Not for Reproduction

411SAFETY INFORMATIONThis repair manual contains safety information that is designed to:• Make you aware of hazards associated with engines.• Inform y