WHAT INDICATES AND LEAN CONDITION?

Spark plugs are burning a light, or white color.

Pops back through the carburetor.

A lean condition as well as a rich condition will ruin your engine.

WHAT CAUSES A LEAN CONDITION?

• Jets too small. Now if you have been running the carburetor and it started to run lean, then it isn’t the jets. Jets don’t change over time.
• Moved to 5000+ feet elevation requires the jets to be reduced in size by .002.
• Look for kinked fuel line. Make sure any rubber fuel line is injector fuel line. Ethanol will create havoc on regular rubber.
• Check the float level. Set to specifications.
• Look at the float drop. Is it letting the needle drop out of the seat?
• Test the fuel pump. Check your motors manual for correct pressure, but should be around 4.5 to 5 lbs. Taking off the fuel line and cranking the engine is not enough. You need to test it with a gauge.
• Hot rodding the engine may require more CFM. The Thermoquad is plenty of carburetor, but the jets might now be too small. The current size will be stamped on the jet.
• Popping through the carburetor might be the accelerator circuit not working correctly.
• Float needle could be sticking closed and not keeping the float bowl full.