FAQ: How To Adjust The Carburetor On A Honda 400?

How do you adjust the carburetor on a Honda ATV?

How do I Adjust a Carb on a Honda 300EX ATV?

  1. Locate the carburetor on the top middle of the engine. Turn the gas valve to the off position.
  2. Turn the air valve screw clockwise until the head of the screw touches the frame of the carburetor. Turn the air valve counterclockwise three full turns.

Where is the air fuel mixture screw on 400ex?

The Pilot screw is on the bottom of the carb body in front of the bowl on the engine side of the carb (front).

Why does 400ex backfire?

Popping on decel is usually a result of being rich, or unburned fuel loading up in the exhaust. Popping on acceleration is a lean condition. 2004 440EX.

How do you clean the carburetor on a Honda 400ex?

Thoroughly clean the carburetor body and the float chamber with carb cleaner. Soak the parts in carb cleaner, and remove as much buildup from within the carburetor body and the float chamber as possible. Squirt carb cleaner through all the channels in the carburetor body to rinse them out.

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How do you Jet A 400ex?

Get about 5 or 6 main jets size 150, 155, 160, 165 and 170. Warm the engine to normal operating temperature. Take the vehicle out where you can operate it in 5th gear at top speed. The engine should accelerate to maximum RPM cleanly to top speed and at top speed, it should not surge (lean) or blubber (rich).

How do you know if your ATV is running lean or rich?

A black dry fluffy colored plug is caused by deposits from a carburetor that is running too rich (too much gas), or excessive idling on some engines. Black smoke coming from the exhaust is a sign of a rich air/fuel mixture.

How do you tell if a carburetor is rich or lean?

Typical symptoms of a rich mixture are:

  1. Poor fuel economy.
  2. Sluggish acceleration.
  3. Choke not needed from cold starts.
  4. Sooty or black spark plugs.
  5. Sooty or black muffler end pipes.
  6. Strong smell of gasoline when the machine is at idle.
  7. Uneven running (will often slow from regular idle rpms and then stop)

How do you adjust the air fuel mixture on an ATV?

Make adjustments 1/2 a turn in either direction to find the smoothest idle speed. Turn the screw counterclockwise and clockwise 1/2 a turn from the middle position and listen to the sound of the idle. Set the screw in the position where the engine’s idle sounds most even and smooth to balance the fuel mixture.

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