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mcgarrett · 04-10-2023, 08:46 AM

I would respectfully ask; how do you know that it's running lean after only 5 miles of running? If the plugs were new when you started out, they might need a little more run-time to display the tan color you're looking for. Did you notice any other symptoms that would lead you to believe it was running lean? If you are using a paper air filter I would suggest removing it.

As Synchro says, you might want to start by opening the GAV more while driving at a constant speed to see if the condition improves - the engine will tell you what it wants. If you don't see any change in the plug color, a slightly colder plug might be the next move.

04-10-2023, 08:46 AM	#5
mcgarrett Senior Member Join Date: Dec 2013 Location: Corsicana, Texas Posts: 1,306	Re: B Carb Runs Lean @45 MPH I would respectfully ask; how do you know that it's running lean after only 5 miles of running? If the plugs were new when you started out, they might need a little more run-time to display the tan color you're looking for. Did you notice any other symptoms that would lead you to believe it was running lean? If you are using a paper air filter I would suggest removing it. As Synchro says, you might want to start by opening the GAV more while driving at a constant speed to see if the condition improves - the engine will tell you what it wants. If you don't see any change in the plug color, a slightly colder plug might be the next move.