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What would cause a 1992 Harley sportster 1200 screeming eagle to back fire when you excelerate we replaced the ignition mod?
Wiki User
∙ 14y ago
There are a couple of things to consider. If you are running straight pipes it could decrease performance of your carb. Checking the spark plugs will reveal a lot of the problems. eg. if plugs are coated with black deposits; your running too rich. Check pipes for same thing; if they are coated with black residue; too rich. Solution; adjust your carb as per manufacturer specs or resize main or intermediate jets. Too rich, smaller diameter orifice, too lean larger. Hope this helps
Wiki User
∙ 14y ago
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