I have a 98 Road King garage kept with 4K miles on it, while riding with engine underload it feels as if I am turning the ignition switch on and off, pop back fire etc. Removed ignition switch, clean inspected and reassembled and no change. Spring tensions check out, can't figure it out, any thoughts?

 

Carbed or EFI? Checked the plugs? Intake leak?

 

EFI
Feels like primary ignation failure, with both cyclinders shutting off???

 

Sound more like old gas or dirty injectors. if you havn't try Sta-bil

 

Only 4,000 on a 98? You need to ride it more

I had a fuel regulator fail on my 05 Nightrain that gave similar symptoms. It would stumble only once and a while and backfire real bad on decel. It would still start and run just fine and it was intermitten.

Good luck.

 

Have you been storing it with a fuel stabilizer?How old is the gas in the tank?

 

say all the above. if its been sitting or barely used for 11yrs what kind of maint has been done to?