For Parts Call 606-678-9623 or 606-561-4983 Professional Shop Manual 25cc 2-Cycle P25 Series Engines NOTE: These materials are for use by trained technicians who are experienced in the service and repair of outdoor power equipment of the kind described in this publication, and are not intended for use by untrained or inexperienced individuals. These materials are intended to provide supplemental information to assist the trained technician.
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For Parts Call 606-678-9623 or 606-561-4983 Table of Contents Chapter 1: Introduction 1 Professional Shop Manual intent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Fasteners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
For Parts Call 606-678-9623 or 606-561-4983 Chapter 5: Fuel system and carburetor 25 Fuel system troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Inspecting the fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Check the fuel/oil mixture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 To check the fuel in the carburetor: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
For Parts Call 606-678-9623 or 606-561-4983 Introduction CHAPTER 1: INTRODUCTION Professional Shop Manual intent This Manual is intended to provide service dealers with an introduction to the mechanical aspects of the 25cc P25 series of 2-cycle engines. Disclaimer: The information contained in this manual is correct at the time of writing. Both the product and the information about the product are subject to change without notice.
For Parts Call 606-678-9623 or 606-561-4983 P25 Series of engines Assembly Torque specifications may be noted in the text that covers assembly, they may also be summarized in tables along with special instructions regarding locking or lubrication. Whichever method is more appropriate will be used. In many cases, both will be used so that the manual is handy as a quick-reference guide as well as a step-by-step procedure guide that does not require the user to hunt for information.
For Parts Call 606-678-9623 or 606-561-4983 Introduction Identifying engines MTD currently has two cantilever crank, 2-cycle engines: the A31 and the P25. NOTE: The starter is mounted between the engine and the drive shaft on all cantilever engines. A31 Fuel tank • 31 cc’s of displacement. • Muffler on back side of engine. Air filter • Fuel cap on top of engine. • Air filter on rear of engine. • Reed valve/loop scavenged design. Muffler Figure 1.2 P25 • 25cc’s of displacement.
For Parts Call 606-678-9623 or 606-561-4983 P25 Series of engines Model and Serial Numbers The model (item) and serial number are on a little white sticker with bar code. These are the numbers needed when ordering parts. This sticker can be found on the side of the engine. Model number Serial number Figure 1.4 The model number is 41BD160G965. The break down of what the number mean is as follows: 41 ............................................................................................
For Parts Call 606-678-9623 or 606-561-4983 Maintenance CHAPTER 2: MAINTENANCE MAINTENANCE The information in this manual applies to the P25 series of engines. Some basic principles may apply to other engines produced by MTD and other manufacturers. As the saying goes “an ounce of prevention is worth a pound of cure”. The same can be said about preventive maintenance on outdoor power equipment. By changing the spark plug and air filter at recommended intervals many failures can be avoided.
For Parts Call 606-678-9623 or 606-561-4983 P25 Series of engines Spark plugs The spark plug used in the 25cc trimmer is a Champion RDJ7J (794-00055) gapped to 0.025” (0.655 mm). See Figure 2.3. Center electrode Wear rate will vary with severity of use. If the edges of the center electrode are rounded-off, or any other apparent wear / damage occurs, replace the spark plug before operating failure (no start) occurs. Cleaning the spark plug: NOTE: MTD does not recommend cleaning spark plugs.
For Parts Call 606-678-9623 or 606-561-4983 Maintenance Spark arrestor A spark arrestor is a screen that is in the outlet of the muffler. It’s job is to collect any sparks or hot embers that are exiting the muffler. The spark arrestor will develop a carbon build up over time. This build up will restrict the exhaust flow, affecting engine performance. The spark arrestor is part of the muffler and is not accessible for cleaning. It should be inspected every 25 hours of use.
For Parts Call 606-678-9623 or 606-561-4983 P25 Series of engines Fuel filer A dirty fuel filter can result in a lean run condition. The fuel filter should be inspected every 25 hours of use. NOTE: The weighted fuel filter (clunk) keeps the filter submerged in the fuel at any angle of operation. The filter removes dirt and air bubbles from the fuel. Running the trimmer without the filter may allow air into the fuel line creating a lean run condition at higher RPMs.
For Parts Call 606-678-9623 or 606-561-4983 Maintenance Storage When storing a piece of gas powered equipment for longer than 4 weeks, the following procedures will prolong the engine life and minimize issues such as hard starting after storage. 1. Run the engine until it is out of gas. 2. Open the air filter cover. 3. Spray some oil down the throat of the carburetor. 4. Close the air filter cover. 5. Pull the starter rope to turn the engine over a few times.
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For Parts Call 606-678-9623 or 606-561-4983 Troubleshooting CHAPTER 3: TROUBLESHOOTING Definitions Troubleshooting - The act of gathering information by performing tests and direct observations. Diagnosis - A theory of what the problem is, based on the information gathered by troubleshooting. Introduction Diagnosing an engine is an art form that is built on several factors. First and most importantly is a good understanding of how the engine works.
For Parts Call 606-678-9623 or 606-561-4983 P25 Series of Engines There are tools that the technician can use in order to define the problem, such as: 1. 2. Interview the customer. • Get a good description of their complaint. • If it is an intermittent problem, verify what conditions aggravates the problem as best as possible. • Get an accurate service history of the equipment. • Find out how the customer uses and stores the equipment.
For Parts Call 606-678-9623 or 606-561-4983 Troubleshooting Identify factors that could cause the problem This is the second step in the troubleshooting process. 1. Crankshaft will not turn. • • Hard to pull rope, steady pressure - This usually indicates a mechanical bind of some sort. the likely suspects are: II. A parasitic load from a jammed attachment or drive shaft. III. An internal drag from a scored or seized piston.
For Parts Call 606-678-9623 or 606-561-4983 P25 Series of Engines 6. Starts, runs poorly • Starts, then dies I. Run the engine with a spark tester in-line between the spark plug wire and the spark plug or use an oscilloscope and see if the spark goes away at the same time the engine dies. II. Check choke operation. a. Black smoke? b. Wet plug? • III. Test for invisible damage to the air filter by starting the engine with the air filter removed. IV. Prime test immediately after engine dies.
For Parts Call 606-678-9623 or 606-561-4983 Troubleshooting • Too much fuel: needle valve stuck or metering / emulsion issues with the carburetor. b. Blue smoke, usually light. • Too much oil in the fuel mix. IX. Piston rings a. Confirm with compression test. b. Repair may not make economic sense. X. Makes unusual noise when running. • Knock * Check for loose mounting of engine or driven implement * Rotate crankshaft back-and-forth to check for loose connecting rod.
For Parts Call 606-678-9623 or 606-561-4983 P25 Series of Engines Repairing the problem The third step in the diagnostic process is to repair the problem. This step consists of: 1. Form a diagnosis by using all of the information gathered from the troubleshooting that was performed. 2. Physically perform the repair. The fourth, and hopefully final, step in the troubleshooting process is the follow through. This step consists of: 1.
For Parts Call 606-678-9623 or 606-561-4983 Troubleshooting Prime test To perform a prime test: 1. Prime the engine through the carburetor throat using a squirt bottle, filled with clean fresh gasoline/oil mix. NOTE: Inspect the air filter while priming the engine. Look for a dirty or plugged filter that could prevent air flow or a missing filter that would indicate dirt ingestion. 2. Make sure the ignition switch is in the run position. 3. Attempt to start the engine. 4.
For Parts Call 606-678-9623 or 606-561-4983 P25 Series of Engines Compression testing To perform a compression test: NOTE: If the engine will run, start the engine and let it warm up first for a better reading. 1. Disconnect the high-tension lead from the spark plug and ground it well away from the spark plug hole. 2. Remove the spark plug using a 5/8” spark plug socket. 3. Pull the starter rope several times to purge any fuel or oil from the combustion chamber.
For Parts Call 606-678-9623 or 606-561-4983 Ignition CHAPTER 4: IGNITION Troubleshooting the Ignition System The purpose of the ignition system is to provide a spark in the combustion chamber at the proper time to ignite the fuel/air mixture. To troubleshoot the ignition system: Spark tester 1. Examine the spark plug by following the steps described in the spark plug section of this chapter. 2. After examining the spark plug, reinstall it, or a new one to ensure a good spark plug is being used. 3.
For Parts Call 606-678-9623 or 606-561-4983 P25 Series of Engines Testing the module To test the module: 1. Remove the starter housing by following the procedures described in Chapter 6: Starter. 2. Check the air gap for the module. Set it to 0.010” by following the steps described in the module section of this chapter. See Figure 4.3. 3. Disconnect the red wire. 4. Install the starter as described in the starter section of this chapter. 5.
For Parts Call 606-678-9623 or 606-561-4983 Ignition Test the engine stop switch To test the engine stop switch: Switch in the engine run position 1. Open the grip by removing the five screws with a T-20 torx driver. 2. Disconnect the wires from the engine stop switch. 3. Connect an ohm meter or continuity light to the switch. 4. With the switch in the engine run position (l), the meter should indicate no continuity. See Figure 4.4.
For Parts Call 606-678-9623 or 606-561-4983 P25 Series of Engines Module Remove the ignition module: 1. Remove the starter by following the procedures described in Chapter 6: starter. 2. Disconnect the red wire from the module. See Figure 4.6. Black wire on mounting screw Red wire NOTE: The black wire will come off with the module mounting screws. 3. Remove the module by removing the two screws. 4. To install the module, turn the flywheel so that the magnets are away from the module. 5.
For Parts Call 606-678-9623 or 606-561-4983 Ignition Flywheel The flywheel of an engine performs four functions: • It stores energy. • Provides the momentum that keeps the crankshaft rotating between power strokes. Gently pry while striking • It times the firing of the ignition module. • Forces air around the engine for cooling. To remove the flywheel: Figure 4.7 1. Remove the spark plug by following the steps described in Chapter 2: Maintenance. 2.
For Parts Call 606-678-9623 or 606-561-4983 P25 Series of Engines 24 www.mymowerparts.
For Parts Call 606-678-9623 or 606-561-4983 Fuel System And Carburetor CHAPTER 5: FUEL SYSTEM AND CARBURETOR The function of the fuel system is to store fuel/oil mixture, mix the fuel/oil with air and deliver it to the combustion chamber. The fuel system consists of the following components: • Fuel tank • Fuel lines • Fuel filter • Carburetor NOTE: When working on the fuel systems, look at the whole system. A problem will rarely be isolated to one component.
For Parts Call 606-678-9623 or 606-561-4983 P25 Series of Engines Check the fuel/oil mixture To check the fuel in the carburetor: 1. Get a plain piece of paper. 2. Divide it into four sections and label them: 3. • Plain gas • Two cycle mix • Gas from carburetor • Straight oil Get a sample of fuel from the carburetor and pour it on the section of the paper labeled sample from carburetor. See Figure 5.1. Figure 5.1 4.
For Parts Call 606-678-9623 or 606-561-4983 Fuel System And Carburetor Test fuel for alcohol Fuels currently on the market contain a wide array of additives. Some of these additives oxygenate the fuel. Oxygenated fuel reduces emissions, and is required in some parts of the United States. Fuel make-up varies seasonally and geographically. Ethanol is the primary additive used to oxygenate fuel. Ethanol in fuel creates a lot of problems for gasoline engines.
For Parts Call 606-678-9623 or 606-561-4983 P25 Series of Engines Fuel filer A dirty fuel filter can result in a lean run condition. The fuel filter should be inspected every 25 hours of use. NOTE: The weighted fuel filter (clunk) keeps the filter submerged in the fuel at any angle of operation. The filter removes dirt and air bubbles from the fuel. Running the trimmer without the filter may allow air into the fuel line creating a lean run condition at higher RPMs.
For Parts Call 606-678-9623 or 606-561-4983 Fuel System And Carburetor Fuel lines • The carburetor contains a pump that draws fuel through the filter and up the fuel line. A hardened fuel line that has cracked or does not seal tightly to a fitting may draw air into the line without leaking fuel out. • Air leaks will reduce the fuel pumps ability to supply the carburetor.
For Parts Call 606-678-9623 or 606-561-4983 P25 Series of Engines Fuel tank To remove/replace the fuel tank: 1. Drain the fuel tank. 2. Disconnect the fuel lines from the carburetor. See Figure 5.9. Disconnect the fuel lines Figure 5.9 3. Remove the two screws that hold the fuel tank to the starter housing using a T-20 torx driver. See Figure 5.10. 4. Slide the tank out to the rear. 5. Install the fuel tank by following the previous steps in reverse order. Screws Figure 5.10 30 www.
For Parts Call 606-678-9623 or 606-561-4983 Fuel System And Carburetor Carburetor The P25 series of engines uses the Walbro WT series carburetors, or a carburetor of similar design from another manufacturer. The main distinguishing features of this carburetor design are: • It has a butterfly valve, not a rotary throttle valve. • The primer bulb is mounted on the carburetor.
For Parts Call 606-678-9623 or 606-561-4983 P25 Series of Engines 6. If the fuel/air mixture is lean: • Inspect the carburetor spacer for cracks. • Inspect the spacer O-ring. NOTE: A cracked spacer or a leaking O-ring between the spacer and the cylinder or the spacer and the carburetor could result in a lean run condition or prevent the impulses from the engine from driving the fuel pump. See Figure 5.13. Spacer O-ring Figure 5.13 7.
For Parts Call 606-678-9623 or 606-561-4983 Fuel System And Carburetor Disassembly of the carburetor 1. Remove the two screws that hold the primer pump body and the primer bulb to the carburetor using a #2 phillips screwdriver. See Figure 5.15. 2. Separate the primer pump and the bulb assembly, placing each part on the bench in the order they came apart. See Figure 5.16. 3. Inspect the diaphragm and gasket. If torn, damaged or brittle install a diaphragm kit. 4. Inspect the primer bulb. 5.
For Parts Call 606-678-9623 or 606-561-4983 P25 Series of Engines 7. 8. Inspect for dirt or varnish build up inside the carburetor. If there is a lot of dirt/varnish in the carburetor, replace it. See Figure 5.18. Metering chamber Cover Check that the needle valve is set to the right height. See the carburetor manufacturer for the proper procedure. Diaphragm Figure 5.18 9. Inspect the metering valve and the metering valve seat for dirt and/or pitting. See Figure 5.19. 10.
For Parts Call 606-678-9623 or 606-561-4983 Fuel System And Carburetor 11. Remove the throttle plate using a #2 phillips screwdriver. See Figure 5.21. Butterfly valve Figure 5.21 12. Remove the throttle shaft E-clip. See Figure 5.22. 13. Slide the throttle shaft out of the carburetor. E-clip Figure 5.22 14. The orifice\check valve can also be seen from the pump side of the throttle housing. See Figure 5.23. Orifice\check valve Figure 5.23 35 www.mymowerparts.
For Parts Call 606-678-9623 or 606-561-4983 P25 Series of Engines Fuel flow NOTE: The fuel pump in the carburetor is driven by pressure pulses in the crank case. The impulse port from the spacer lets the pulses pass through the carburetor body into the pump camber. See Figure 5.24. 15. Impulse port Pump chamber Make sure these ports are clean and free of debris. Fuel inlet Impulse port Figure 5.24 36 www.mymowerparts.
For Parts Call 606-678-9623 or 606-561-4983 Fuel System And Carburetor Re-assembly of the carburetor Needle valve seat NOTE: The carburetor used in this manual is a Walbro. Depending on the application, the engine may have a different carburetor. All carburetors have a manufacturer name cast on them. Contact the carburetor manufacturer for the proper rebuild procedure. 1. Place the carburetor in a clean area on the work bench. 2. Inspect the needle valve seat assembly. 3.
For Parts Call 606-678-9623 or 606-561-4983 P25 Series of Engines 11. Inspect the primer pump body for dirt and/or varnish. See Figure 5.28. 12. Install the diaphragm and gasket. 13. Install the primer pump body and the primer bulb. 14. Tighten the screws using a #2 phillips screwdriver. 15. Perform a needle valve pop off test by following the carburetor manufacturer’s recommendations. 16. Install the carburetor on the engine. 17. Test run the engine before returning it to service.
For Parts Call 606-678-9623 or 606-561-4983 Fuel System And Carburetor Carburetor insulator NOTE: A cracked spacer or a leaking gasket between the spacer and the cylinder could result in a lean run or prevent the impulses from the engine from driving the fuel pump. Press in the tabs To remove/replace the carburetor insulator: 1. Remove the carburetor by following the procedures described in the carburetor section of this chapter. 2.
For Parts Call 606-678-9623 or 606-561-4983 P25 Series of Engines 6. Inspect the O-ring between the insulator block and the cylinder. See Figure 5.32. 7. Install the insulator by following the previous steps in reverse order. O-ring NOTE: Apply a small amount of releasable thread locking compound such as Loctite® 242 (blue) to the carburetor insulator block to cylinder screws. Tighten them to a torque of 45 - 50 in lbs (5 - 6 Nm). 8. Test run the engine before returning it to service. Figure 5.
For Parts Call 606-678-9623 or 606-561-4983 Starters CHAPTER 6: STARTERS Recoil Starter Removal To remove the starter assembly: 1. Remove the clutch following the steps described in the section on clutch removal. NOTE: The drive shaft will come off with the clutch housing. 2. Remove the screw that hold the engine cover to the starter housing using a T-20 torx driver. See Figure 6.1. 3. Remove the two fuel tank mounting screws using a T20 torx driver. 4.
For Parts Call 606-678-9623 or 606-561-4983 P25 Series of Engines 5. Remove the three screws in the front of the starter housing. See Figure 6.2. 6. Slide the starter housing off of the engine. 7. Install the starter assembly by following the previous steps in reverse order. 8. Test run the engine before returning it to service. Screws Figure 6.3 42 www.mymowerparts.
For Parts Call 606-678-9623 or 606-561-4983 Starters The starter rope, pulley and springs The 25cc P25 series of engines are equipped with the Assist Spring Technology (AST) starters.The AST system allows the customer to pull the recoil rope at any pace they please, yet still generate enough force to start the engine. The system is simple, and adds a grand total of two parts to the trimmer: a recoil pulley assembly, which includes an accumulator spring.
For Parts Call 606-678-9623 or 606-561-4983 P25 Series of Engines NOTE: The recoil pulley assembly consists of three parts, but it is serviced as one assembly. The three parts are: the inner pulley, the starter assist (accumulator) spring, and the outer pulley. See Figure 6.6. NOTE: When the recoil rope is pulled, it rotates the outer pulley, winding-up the starter assist spring.
For Parts Call 606-678-9623 or 606-561-4983 Starters To assembly the starter pulley assembly: 1. Install a new starter rope in the recoil pulley assembly. 1a. Remove the old rope from the pulley. 1b. Cut a piece of #3 1/2 (7/64”) starter rope 43” (109 cm) long. 1c. Insert the new piece of rope through the hole in the starter pulley. 1d. Tie a half hitch knot at the end of the rope. 1e. Press the knot into the grove in the starter pulley. Figure 6.8 2.
For Parts Call 606-678-9623 or 606-561-4983 P25 Series of Engines 8. Secure the recoil handle to the rope using two half hitch knots. See Figure 6.11. 9. Release the slip knot. 2 half hitch knots Figure 6.11 10. Install the pulley retainer using a deep socket to apply even pressure to the retainer while driving it into place. See Figure 6.12. Deep well socket Figure 6.12 NOTE: The central post has a shoulder on it that acts as a stop for the pawl nut. Drive the pawl nut down till it stops.
For Parts Call 606-678-9623 or 606-561-4983 Clutch and Upper Drive Shaft CHAPTER 7: CLUTCH AND UPPER DRIVE SHAFT Drive shaft assembly There are two types of drive shaft assemblies available with the P25 series of engines: • Straight shaft • Curve shaft NOTE: The procedure to remove the drive shaft assembly from the engine is the same for both styles. NOTE: The drive shaft assembly consists of the drive shaft housing and a flexible inner drive shaft.
For Parts Call 606-678-9623 or 606-561-4983 P25 Series of Engines 3. Remove the anti-rotation screw with a T-20 driver. 4. Loosen the clamping bolt with a T-20 driver. See Figure 7.3. 5. Slide the drive shaft housing out of the clutch housing. 6. If replacing the drive shaft housing, remove the handle bar, shield and the trimmer head. Anti-rotation screw Clamping bolt Figure 7.3 7. Slide the drive shaft out of the housing. See Figure 7.4. 8.
For Parts Call 606-678-9623 or 606-561-4983 Clutch and Upper Drive Shaft Clutch removal/replacement Clutch housing screws NOTE: The upper drive shaft may be left connected to the clutch housing. Removing the three screws in the clutch housing will allow the clutch housing and the upper drive shaft to be removed as one. 1. Remove the three screws holding the clutch housing on with a T-20 driver. See Figure 7.5. 2. Disconnect and remove the spark plug. 3. Insert at least 18” (0.
For Parts Call 606-678-9623 or 606-561-4983 P25 Series of Engines 5. Remove the clutch rotor with a clutch removal tool. NOTE: The P25 engines use a rubber clutch. Clutch tool number 797-00070 can be used to remove it. See Figure 7.8. Part number 797-00070 NOTE: The clutch is used to disconnect the drive shaft for starting. It will engage at 2,000 RPM. This means the trimmer head will spin at idle speed. Figure 7.8 6. Install the clutch rotor.
For Parts Call 606-678-9623 or 606-561-4983 Engine Assembly CHAPTER 8: ENGINE ASSEMBLY Theory of operation The P25 series of engines are piston ported engines. As the piston travels upward: • The exhaust port is covered. Exhaust port Intake port • The fuel/air mixture above the piston is compressed. See Figure 8.1. • Fuel/air mix is drawn into the crankcase. • The spark plug will fire just before the piston reaches top dead center, igniting the fuel/air mixture. Figure 8.
For Parts Call 606-678-9623 or 606-561-4983 P25 Series of Engines Engine disassembly Economics and parts availability will determine how much engine disassembly is feasible. There are two main levels of engine disassembly. 1. Short block installation. Short block installation consists of removing the engine, transferring the external parts to the replacement short block, and installing the engine. External parts consist of: 2.
For Parts Call 606-678-9623 or 606-561-4983 Engine Assembly 5. Rotate the flywheel so that the magnets are away from the module. 6. Remove the two screws that secure the ignition module to the block using a T-20 torx driver. See Figure 8.4. 7. Remove the module. 8. Remove the flywheel by applying a sharp blow to the crankshaft while gently prying upward with a pry bar. The flywheel will loosen then lift it off. See Figure 8.5. Screws Figure 8.4 Never strike the crankshaft directly with a hammer.
For Parts Call 606-678-9623 or 606-561-4983 P25 Series of Engines 10. Remove the two cylinder bolts using a T-30 torx driver. See Figure 8.7. 11. Slide the cylinder off of the piston and connecting rod. 12. Remove the O-ring from the cylinder base. Cylinder bolts Figure 8.7 NOTE: The following steps are shown only for the purpose of failure analysis. 13. Slide the connecting rod off of the crank pin. Figure 8.8 14.
For Parts Call 606-678-9623 or 606-561-4983 Engine Assembly Engine Reassembly 1. Lettering Attach the piston to the connecting rod, if removed, by inserting the piston pin. NOTE: The side of the connecting rod with the lettering on the bearing faces the side of the piston the cap is on. See Figure 8.10. NOTE: The piston pin will only slide in from one side. After sliding the piston pin in, insert the piston pin cap. Piston pin cap Figure 8.10 2. Install the piston rings on the piston.
For Parts Call 606-678-9623 or 606-561-4983 P25 Series of Engines Exhaust port NOTE: Apply a coating of Slick 50® or similar product to the connecting rod bearing as a assembly lube. 5. Place the cylinder O-ring on the crankcase. 6. Slide the connecting rod onto the crankshaft pin. NOTE: The lettering on the connecting rod bearing must face the crankshaft and the exhaust port must face the mounting arm of the ignition coil. See Figure 8.13.
For Parts Call 606-678-9623 or 606-561-4983 Engine Assembly 10. Install the flywheel and module by following the procedures described in Chapter 4: Ignition. 11. Install the muffler. NOTE: Apply a thread locking compound such as Loctite 266 to the muffler screws. Tighten the screws to a torque of 80 - 90 in. lbs (9 - 10 Nm). 12. Install the starter by following the procedures described in Chapter 6:Starter. 13.
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For Parts Call 606-678-9623 or 606-561-4983 MTD Products Inc - Product Training and Education Department FORM NUMBER - 769-06465 10/2010 www.mymowerparts.
