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General Guide for Rebuilding Honda CB350 Carburetors

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Rebuilding carburetors can be a rewarding DIY project, but it requires careful attention to detail and some mechanical know-how. Rebuilding the carburetors of a Honda CB350 involves several steps. Here's a general guide to help you get started:

Tools and Materials You'll Need:

  • Carburetor rebuild kit (specific to your CB350 model)
  • Screwdrivers (flat-head and Phillips)
  • Needle-nose pliers
  • Cleaning solvent (carburetor cleaner)
  • Compressed air
  • Safety goggles and gloves
  • Shop rags or paper towels
  • Service manual for your CB350 (for reference)
  • Replacement gaskets and o-rings (if not included in the rebuild kit)
  • Basic hand tools (wrenches, sockets, etc.)

Step-by-Step Guide:

1. Preparation:

  • Make sure you have a clean, well-lit workspace with proper ventilation.
  • Consult your CB350's service manual for specific instructions and diagrams that match your carburetor model.

2. Removal:

  • Disconnect the battery to prevent accidental sparking.
  • Remove the gas tank and other parts that may be obstructing access to the carburetors.
  • Carefully detach the carburetors from the engine, ensuring you label or take photos of any hoses or connections for reassembly.

3. Disassembly:

  • Carefully disassemble each carburetor, taking note of the order of parts and their positions.
  • Remove the float bowls, floats, jets, needles, and other components. Keep them organized and clean.

4. Cleaning:

  • Soak all metal and non-rubber parts in a quality carburetor cleaner to remove old fuel deposits and grime.
  • Use a small brush, toothbrush, or pipe cleaner to clean out the jets, passages, and other small orifices.
  • Use compressed air to blow out any remaining debris. Be careful with the air pressure to avoid damaging sensitive parts.

5. Inspection:

  • Inspect all components for wear, damage, or corrosion. Replace any parts that are worn beyond their service limit.
  • Check the rubber diaphragms and seals for cracks or brittleness. If they are damaged, replace them.

6. Reassembly:

  • Install new gaskets, o-rings, and any other parts included in the rebuild kit.
  • Reassemble the carburetors in the reverse order of disassembly, referring to your photos or labels.
  • Make sure all parts are properly aligned and seated.

7. Adjustments:

  • Set the float height according to your service manual's specifications.
  • Set the idle mixture screws to the recommended initial settings (usually around 1.5 turns out) and fine-tune later.

8. Installation:

  • Reattach the carburetors to the engine, connecting all hoses and cables properly.
  • Reinstall the gas tank and other removed parts.

9. Testing and Tuning:

  • Reconnect the battery and turn on the fuel supply.
  • Start the engine and let it warm up.
  • Adjust the idle speed and idle mixture screws for smooth idling.
  • Take the bike for a test ride to ensure proper throttle response and overall performance.
  • Fine-tune the carburetors as needed based on how the bike runs.

Remember, this is a general guide, and the specific steps and settings may vary depending on the exact model and year of your CB350. Always consult the service manual for accurate instructions and specifications. If you're not confident in your mechanical abilities, it's a good idea to seek assistance from a professional mechanic or someone experienced in motorcycle carburetor work.



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