Adjustments to Engine with Headers

[J4GRAND]

Got my J4000 back from the muffler shop where they installed my powder-coated Hedman's and dual Flowmaster 40 series. Not complaining at all about the sound but seem to have a slight stumble out of the hole. For those that have gone the header route, did you have to readjust anything on the engine? Will try to get pics up soon.

[SpruceMoose]

the engine now flows a bit better. probably need to richen it up a bit. either the idle mixture, the accelerator pump, or both.

sm.

[Hammer]

accelerator pump, and you will also want to adjust the vacuum advance as well.

[paddyp]

You need to richen it up a little bit running a better exhaust.