Carburetor Repair Kit Instruction Manual

1. Introduction

This instruction manual provides guidance for the installation and maintenance of the DEF Carburetor Repair Kit, model 796184. This kit is designed for the overhaul of Nikki carburetors found in various engines, including Briggs & Stratton and Craftsman models ranging from 11HP to 19HP. It replaces old Briggs part numbers such as 698787, 699900, 699521, 792369, and 790032. The kit contains essential components to restore proper carburetor function.

2. Package Contents

Carefully unpack the kit and verify all components are present. The kit includes the following parts:

• 692137 Gasket-Intake
• 694918 Pin-Float Hinge
• 696136 Valve-Float Needle
• 796081 Gasket-Intake
• 690727 Plug-Welch
• 698777 Seal-Throttle Shaft
• 699813 Seal-Choke/Throttle Shaft
• 692138 Seal-O Ring
• 698781 Gasket-Float Bowl
• 691917 Seal-O Ring
• 697123 Seal-O Ring
• 695408 Kit-Idle Speed
• 695409 Spring-Choke Return
• 692255 Washer-Sealing
• 695410 Washer-Seal
• 694914 Float
• 792022 Fuel Transfer Tube
• 793610 Idle Mixture Kit
• 690718 Throttle Valve Screw (x2)

This image displays all components included in the repair kit, laid out on a white background. Visible parts include various black and red O-rings, different shaped gaskets, a white plastic float, a white plastic base component, small black foam filters, brass pins, springs, and an assortment of screws and washers.

3. Installation Guide

This kit is intended for experienced users or those with mechanical aptitude. Always refer to your engine's specific service manual for detailed disassembly and reassembly procedures. Ensure the engine is cool and disconnected from any power source before beginning work.

1. Carburetor Removal: Carefully remove the carburetor from the engine, noting the position of all linkages and hoses.
2. Disassembly and Cleaning: Disassemble the carburetor, paying close attention to the order and orientation of all components. Thoroughly clean all carburetor passages and components with a suitable carburetor cleaner. Ensure all old gaskets and O-rings are removed.
3. Component Replacement: Replace worn or damaged parts with the new components from this kit.
   • Install new intake gaskets (692137, 796081).
   • Replace the float (694914) and float hinge pin (694918).
   • Install the new float needle valve (696136). Ensure it moves freely.
   • Replace all O-rings (692138, 691917, 697123) and seals (698777, 699813) as applicable. Apply a small amount of clean engine oil to O-rings for easier installation and better sealing.
   • Install the new idle speed kit (695408) and idle mixture kit (793610) components.
   • Replace the fuel transfer tube (792022) and any other small parts like Welch plugs (690727), springs (695409), washers (692255, 695410), and throttle valve screws (690718).
4. Reassembly: Reassemble the carburetor in reverse order of disassembly. Ensure all screws are tightened to the manufacturer's specifications.
5. Reinstallation: Reinstall the carburetor onto the engine, reconnecting all linkages, hoses, and fuel lines securely.

4. Operating Considerations After Rebuild

After installing the repair kit and reassembling the carburetor, perform the following checks:

• Fuel Leak Check: Before starting the engine, check for any fuel leaks around the carburetor and fuel lines.
• Initial Start-up: Start the engine and allow it to warm up.
• Idle Adjustment: Adjust the idle speed and mixture screws according to your engine's service manual to achieve smooth operation.
• Performance Check: Test the engine under various loads to ensure proper fuel delivery and responsiveness.

5. Maintenance

Regular maintenance helps prolong the life of your carburetor and engine:

• Fuel Quality: Always use fresh, clean fuel. Stale or contaminated fuel can cause carburetor issues.
• Fuel Filter: Regularly inspect and replace the fuel filter to prevent debris from entering the carburetor.
• Storage: If storing the engine for an extended period, drain the fuel from the carburetor or use a fuel stabilizer to prevent gumming and varnish buildup.
• Air Filter: Ensure the air filter is clean and properly installed to prevent dirt from entering the carburetor and engine.

6. Troubleshooting

If you encounter issues after installing the repair kit, consider the following:

• Engine Runs Rich (Black Smoke, Fouled Spark Plug): This indicates too much fuel. Check the float level; if it's too high, the needle valve may not be seating correctly. Ensure the main jet is the correct size for your engine and not enlarged.
• Engine Runs Lean (Lack of Power, Overheating, Backfiring): This indicates insufficient fuel. Check for vacuum leaks, ensure all gaskets are properly sealed, and verify that fuel passages are clear. The main jet might be too small or partially clogged.
• Fuel Leaks: Recheck all gaskets and O-rings for proper seating and damage. Ensure the float bowl gasket (698781) is correctly installed and not pinched. Verify that the fuel transfer tube (792022) is seated correctly.
• Hard Starting/No Start: Confirm fuel flow to the carburetor. Check the float needle valve (696136) for proper operation. Ensure all passages are clear and jets are not clogged.
• Parts Fitment: While this kit is designed for specific models, slight variations can occur. If a plastic body piece or other component does not fit perfectly, ensure no binding or cracking occurs during installation. Sometimes, reusing an existing, undamaged component may be necessary if fitment is an issue.

7. Specifications

8. Warranty and Support

For any questions regarding this product, its installation, or potential warranty claims, please contact the manufacturer or your point of purchase. Keep your purchase receipt as proof of purchase.