Today while riding everything was good until I accelerated to pass a car. When I backed off the gas bike started to break up and sputter. It stayed running and will start fine it just sputters and feels like it is running on one cylinder. I don't have a check engine light on yet but was wondering if anyone else has had this problem.

 

Water in fuel? Stale gas, loose or dirty battery cable?. That's my first items to check, after that there are 20+ other possibilties. You have to have spark and fuel. Start with the basics. What make/model, miles?

 

This is on a 2007 night train. I pulled the plugs and they look ok. They are a little old but nothing to show they should be the issues. Spark plug wires are clean on the inside and really the way things happens all of a sudden makes me think it is more of a mechanical issue

 

I just swapped the coil with a spare one I had laying around with no change. My bike sounds like a damn honda when it is idling and real poppy when I blip the gas. I will try a new set of plug wires and spark plugs tomorrow but I don't think that is the problem. I think this problem is fuel related cause it does not smell rich like one would have with a non fire cylinder. My thoughts right now is a dead fuel injector, bad tps sensor, or bad map sensor. Tomorrow I will also do a compession test to make sure it is not a dead cyclinder.

 

my honda vtx 1300c with v&h pipes on it sounded badass, so you have a bigger problem, making derogatory comments doesn't make you cooler

 

Sorry for the offensive words. Just trying to get to the bottom of this without spending
More than the bike is worth. To be honest my bike sounds just like my buddies honda 1300 with drag pipes. Not really a good sound to me. Also I have checked my dtc's and there are no codes popping up. Kind of leaves me with my head scratching here

 

Did a few checks with little progress to the problem. I did a compression test and each cyclinder hits 175 psi + or - 2 psi which is plenty in spec with factory. I pulled the crank shaft position sensor and found no damage with nothing stuck to it. Tomorrow I will continue and work the fuel and intake side. I don't show any signs for a lean condition but I will look the injectors over when I remove the intake. I am really leaning towards a bad map sensor right now

 

Have you changed out the handlebars or recently did something to the electrical system? How is the battery and cables?

What is not stock on your bike?

 

check fuel pressure

 

Bike has been together for a few years now. I rewired the tail lights but they are still working fine. Battery is brand new and it starts great just crap running.