I have a 2004 Dyna Lowrider that misfires in the front cylinder only. Misfires at idle a bit and at 2000rpm has a continuous misfire. Also motorycle boogs down when trying to accelerate from a stop. Forcing me to rev to get it to start moving. I have replaced spark plugs, wires and coil.

 

Welcome to the HDFORUM. Carburetor or fuel injection?

 

if FI check fuel pressure and injector

 

Could be a bad spark plug, plug wire or a coil issue. Try swapping the position of the wires at the coil. If the problem migrates to the rear cylinder you'll know it's the coil. If it doesn't, try swapping out the plug. If the problem persists change out the plug wires.

 

he said he changed these already

 

Assuming carbed.. Check compression.

 

this will also surely cause that issue

 

I forgot to mention it’s fuel injected

 

Compression still stands.. Also front injector and wires.

 

Check for codes? How many miles. Does it have a tuner on it?

When did it last run good?

What other maintenance has been done? Intake fuel filter? Air filter?

You 04 like mine works best with Harley branded OEM low resistance plugs. The have Ion knock control.