FJSa K20-WAT Carburetor Rebuild Kit Instruction Manual

Introduction

This manual provides instructions for the FJSa K20-WAT Carburetor Rebuild Kit. This kit is designed to replace worn or damaged components in compatible Walbro carburetors, restoring optimal performance to your outdoor power equipment.

Compatibility

This rebuild kit is compatible with Walbro K20-WAT and K11-WAT series carburetors, and replaces Husqvarna part numbers 530035300 and 530069668.

Applicable Walbro Carburetor Series:

• WA Series: WA-198, WA-207, WA-214, WA-215, WA-216, WA-217, WA-218, WA-219, WA-221, WA-223, WA-224, WA-226, WA-227, WA-229, WA-230, WA-232
• WT Series: WT-108, WT-109, WT-110, WT-114, WT-116, WT-117, WT-118, WT-119, WT-125, WT-126, WT-127, WT-13, WT-132, WT-14, WT-150, WT-151, WT-156, WT-160, WT-162, WT-163, WT-164, WT-165, WT-169, WT-17, WT-170, WT-171, WT-172, WT-173, WT-174, WT-177, WT-179, WT-183, WT-185, WT-189, WT-19, WT-191, WT-192, WT-193, WT-194, WT-196, WT-201, WT-202, WT-207, WT-208, WT-209, WT-211, WT-212, WT-215, WT-218, WT-221, WT-223, WT-224, WT-225, WT-228, WT-229, WT-234, WT-238, WT-239, WT-241, WT-245, WT-246, WT-249, WT-260, WT-273, WT-281, WT-282, WT-283, WT-285, WT-286, WT-289, WT-290, WT-291, WT-296, WT-299, WT-303, WT-305, WT-306, WT-308, WT-313, WT-315, WT-325, WT-327, WT-332, WT-333, WT-334, WT-336, WT-338, WT-34, WT-346, WT-350, WT-353, WT-354, WT-360, WT-361, WT-363, WT-365, WT-368, WT-374, WT-375, WT-382, WT-384, WT-386, WT-387, WT-388, WT-39, WT-390, WT-394, WT-395, WT-396, WT-399, WT-401, WT-402, WT-403, WT-409, WT-410, WT-414, WT-415, WT-416, WT-417, WT-418, WT-42, WT-426, WT-427, WT-428, WT-429, WT-430, WT-436, WT-441, WT-442, WT-443, WT-444, WT-446, WT-451, WT-458, WT-459, WT-46, WT-460, WT-462, WT-463, WT-465, WT-466, WT-467, WT-472, WT-474, WT-475, WT-478, WT-480, WT-481, WT-484, WT-486, WT-487, WT-488, WT-492, WT-493, WT-494, WT-496, WT-497, WT-498, WT-499, WT-501, WT-503, WT-504, WT-505, WT-506, WT-507, WT-508, WT-509, WT-512, WT-513, WT-514, WT-515, WT-516, WT-517, WT-52, WT-521, WT-525, WT-527, WT-529, WT-531, WT-532, WT-533, WT-534, WT-535, WT-536, WT-537, WT-540, WT-542, WT-543, WT-544, WT-545, WT-547, WT-549, WT-553, WT-555, WT-556, WT-557, WT-558, WT-56, WT-560, WT-561, WT-562, WT-565, WT-566, WT-567, WT-568, WT-569, WT-571, WT-572, WT-573, WT-574, WT-575, WT-577, WT-578, WT-579, WT-580, WT-582, WT-583, WT-584, WT-586, WT-587, WT-588, WT-589, WT-591, WT-593, WT-594, WT-596, WT-598, WT-599, WT-600, WT-601, WT-602, WT-603, WT-604, WT-605, WT-606, WT-607, WT-609, WT-61, WT-610, WT-611, WT-612, WT-614, WT-615, WT-616, WT-617, WT-622, WT-624

Applicable Equipment Models:

• Poulan: 112 PT112 PP113 Gas Trimmer
• Husqvarna: 21 LCN (1995-12) Line Trimmer, 244 RX 33 360 37 BR 370 39R H335 H336 H40 HR39 P400 P442 P5500 P600 P933 R39 R40 Rancher 40
• Weed Eater: LT17 LT7000 LT7500 XT45 Gas Trimmer
• Homelite: 240 245 250 290 300 340
• Jonsered: 33 360 370 P400 P442 P5500 P39 P40
• McCulloch: Mac 35 Mac 40 Mac 46
• Sachs-Dolmar: 100, 102, 109, 110, 111, 115, 340, 400, BC330
• Also compatible with models 021, 023, 025, 026, 1121, 1123, 1130.

Package Contents

Each package includes:

• 2 sets of Diaphragm gasket kits, containing all necessary gaskets, diaphragms, and small components for a complete carburetor rebuild.

Setup and Installation

Safety First: Before beginning any work, ensure the equipment is turned off, cooled down, and disconnected from any power source (e.g., spark plug wire removed). Wear appropriate safety gear, including gloves and eye protection.

Required Tools:

• Screwdrivers (various sizes)
• Pliers
• Carburetor cleaner
• Clean cloth
• Small container for organizing parts

Installation Steps:

1. Disassembly: Carefully remove the carburetor from the engine. Take photos or make notes of hose connections and component orientation to aid reassembly.
2. Cleaning: Disassemble the carburetor, noting the position of all gaskets, diaphragms, and small parts. Clean all metal parts thoroughly with carburetor cleaner. Ensure all passages are clear and free of debris.
3. Inspection: Inspect the carburetor body for any damage or excessive wear. Replace the entire carburetor if significant damage is found.
4. Gasket and Diaphragm Replacement: Replace all old gaskets and diaphragms with the new components from the rebuild kit. Ensure each new part matches the old one in shape and size. Pay close attention to the orientation of the diaphragms.

5. Needle Valve and Spring: Replace the needle valve and spring if included in your kit. Ensure the new needle seats properly.
6. Reassembly: Reassemble the carburetor in reverse order of disassembly. Ensure all screws are tightened securely but do not overtighten.
7. Reinstallation: Reinstall the carburetor onto the engine, reconnecting all hoses and linkages correctly.
8. Initial Start-up: After reassembly, prime the carburetor if necessary and attempt to start the engine. Adjust idle and mixture screws as per your equipment's specific service manual if the engine does not run smoothly.

Operating After Rebuild

After successfully installing the rebuild kit and reassembling the carburetor, the engine should start and run smoothly. Observe the following:

• Fuel System Check: Verify there are no fuel leaks from the carburetor or fuel lines.
• Idle Adjustment: If the engine idles too high or too low, adjust the idle screw according to your equipment's service manual.
• Mixture Adjustment: For carburetors with adjustable high and low-speed mixture screws, fine-tune them according to your equipment's manufacturer specifications for optimal performance and fuel efficiency.

Maintenance

Regular maintenance helps prolong the life of your carburetor and ensures reliable operation.

• Fuel Quality: Always use fresh, clean fuel mixed with the correct oil ratio for 2-stroke engines. Stale or contaminated fuel can cause carburetor issues.
• Fuel Filter: Regularly inspect and replace the fuel filter to prevent contaminants from reaching the carburetor.
• Air Filter: Keep the air filter clean to ensure proper air-fuel mixture. A dirty air filter can lead to rich running conditions and reduced performance.
• Storage: When storing equipment for extended periods, drain the fuel tank and run the engine until it stops, or use a high-quality fuel stabilizer to prevent gumming and corrosion in the carburetor.

Troubleshooting Common Issues

Engine Does Not Start:

• No Fuel: Check the fuel tank level, fuel lines for kinks or blockages, and the fuel filter. Ensure the primer bulb (if present) is working correctly.
• No Spark: Verify the spark plug is clean, properly gapped, and firing. Check the spark plug wire connection.
• Flooded Engine: If the engine is flooded, remove the spark plug, clean it, and pull the starter cord several times with the plug removed to clear excess fuel before reinserting the plug.
• Incorrect Assembly: Double-check all carburetor components for correct placement and sealing, especially gaskets and diaphragms.

Engine Runs Poorly (Rough Idle, Stalling, Lack of Power):

• Mixture Adjustment: Adjust high and low-speed mixture screws according to the equipment's service manual.
• Air Leaks: Inspect for air leaks around the carburetor mounting gaskets or intake manifold. Even small leaks can significantly affect performance.
• Clogged Passages: If cleaning was insufficient, some carburetor passages might still be partially blocked. A more thorough cleaning or professional service may be required.
• Fuel Delivery: Ensure consistent fuel flow without interruptions. Check for a dirty fuel filter or a faulty fuel pump diaphragm.

Specifications

Warranty Information

FJSaDobo provides a 3-month warranty for all products sold. Please retain your proof of purchase for warranty claims. The warranty covers manufacturing defects and material flaws under normal use. It does not cover damage due to improper installation, misuse, or normal wear and tear.

Support

For further assistance or inquiries regarding the FJSa K20-WAT Carburetor Rebuild Kit, please contact FJSaDobo customer support through the retailer where the product was purchased. When contacting support, please refer to the product's ASIN: B08CDPPWDD.