FAQ: How To Adjust Carburetor On Coolster 4 Wheeler?

How do you adjust a running rich carburetor?

Regardless of whether or not the engine is running too rich or too lean, bring it down to a very lean mixture by turning both screws a quarter-turn at a time, counter-clockwise, then slowly bringing them back up to an equal and smooth mixture.

How do you adjust air fuel mixture screws?

Turn the screw clockwise until the engine starts to sound rough.

  1. Tightening the screw weakens the air and fuel mixture and decreases the amount of fuel flowing to the engine.
  2. Tightening the screw is also called making the fuel mixture leaner, which lowers the RPMs at which the engine idles.

What causes a four wheeler to bog down?

The most common cause of an ATV bog down is a dirty air filter and/or dirty carburetor. These issues also apply to instances of bog down when giving gas. The solution to these issues is cleaning the air filter and carburetor or buying a new one when no longer possible.

Why does my four wheeler only run with the choke on?

If a motorcycle or ATV only runs with the choke on, it’s because the richer “choke on” mixture is actually closer to the engine’s normal operating fuel mixture than the leaner “choke off” mixture. So when the choke is turned off, the engine gets too little fuel and too much air for it to run and it stalls.

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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 know if your ATV is running lean?

Lean conditions can be detected by the engine losing power, yet retaining it’s engine speed. For instance, the engine sounds to be accelerating to higher RPMs, yet feels as if it has no power. By looking at the spark plug, a lean condition can be detected by a white, blistered plug.

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 a Solex carburetor?

After the engine is fully warmed up, adjust the idle with a screwdriver at the large Air Bypass Screw on the left side of the Carburetor. Counter-Clockwise increases the idle, Clockwise decreases the idle. Idle speed should be set at approximately 850rpm (+-50rpm), a little higher for Auto-Stick Transmission Models.

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