Header Tuning

After you install headers on your engine, you will need to re-tune the engine. This is due to the improved cylinder scavenging of the exhaust gases. The improved scavenging causes a leaner burn in the cylinder. You will need to enrich the fuel mixer or even re-jet the carburetor primaries.

Starts with a new set of spark plugs and enrich the air/fuel mixture slowly. Check the plug color until you achieve a tan color. White is too lean and sooty black is too rich. This may take some time to get right, but it’s well worth the effort. Don’t forget to take up on those header bolts for the first few days of use, you don’t want an exhaust leak.