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Sportster Motorcycle Air intake, Carburetor, EFI, Fuel, and Exhaust Problems, advice and/or how tos for Sporster and Buell motorcycle carburators, Electronic Fuel Injection (EFI), Air Intake, Fuel and Exhaust.

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  #1  
Old 17th April 2008
Swilster Swilster is offline
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Default 2008 Nightster misfires under load

I've got a new nightster with about 100 miles on it. The first 50 miles it ran great, then it start to feel a little "surgy" in 1st and 2nd gear, felt like an ignition misfire. On the highway at 65mph if I keep it in 4th gear it runs smooth but put it in 5th and it misfires and vibrates very badly. I disabled the rear cylinder (pulled off the plug wire) and there was very little RPM change, disable the front cylinder and the engine will almost stall. I swapped spark plugs from cylinder to cylinder with no change. I'm bringing it back to the dealer tomorrow but would like to know if anyone has experienced this.
Thanks
  #2  
Old 17th April 2008
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did you pull the spark plug from the rear and see if you're getting a consistent spark?
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  #3  
Old 17th April 2008
Swilster Swilster is offline
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Yes, 1/2 inch
  #4  
Old 17th April 2008
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Quote:
Originally Posted by Swilster View Post
Yes, 1/2 inch
I don't understand, Yes, you are getting a consistent spark?
  #5  
Old 17th April 2008
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KaotikEvo KaotikEvo is offline
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Default

I think he's getting a spark while holding the plug 1/2" from the cylinder
  #6  
Old 17th April 2008
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KaotikEvo KaotikEvo is offline
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Default

but then again WTF do I know???
  #7  
Old 17th April 2008
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honkytnkmn is a jewel in the roughhonkytnkmn is a jewel in the roughhonkytnkmn is a jewel in the roughhonkytnkmn is a jewel in the roughhonkytnkmn is a jewel in the roughhonkytnkmn is a jewel in the roughhonkytnkmn is a jewel in the roughhonkytnkmn is a jewel in the roughhonkytnkmn is a jewel in the roughhonkytnkmn is a jewel in the roughhonkytnkmn is a jewel in the rough
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Quote:
Originally Posted by KaotikEvo View Post
but then again WTF do I know???
Thats ok, just wasn't sure what he was talking about. I'd just ask the dealer when you get it back what the problem was.

Sounds to me like you may have a faulty fuel pump or Sensor.

Make sure you let us know.
  #8  
Old 17th April 2008
Swilster Swilster is offline
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I come to this site to ask for help and get a couple smart asses, trying to talk like they actually know they are talking about, I can smell a rookie a mile away. First time and last time at this site, what a joke.
  #9  
Old 17th April 2008
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honkytnkmn honkytnkmn is offline
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honkytnkmn is a jewel in the roughhonkytnkmn is a jewel in the roughhonkytnkmn is a jewel in the roughhonkytnkmn is a jewel in the roughhonkytnkmn is a jewel in the roughhonkytnkmn is a jewel in the roughhonkytnkmn is a jewel in the roughhonkytnkmn is a jewel in the roughhonkytnkmn is a jewel in the roughhonkytnkmn is a jewel in the roughhonkytnkmn is a jewel in the rough
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Quote:
Originally Posted by Swilster View Post
I come to this site to ask for help and get a couple smart asses, trying to talk like they actually know they are talking about, I can smell a rookie a mile away. First time and last time at this site, what a joke.
Sorry, wasn't trying to be a smart ass, just didn't understand your answer.
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Old 17th April 2008
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Mr Jimi Mr Jimi is offline
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Quote:
Originally Posted by Swilster View Post
I come to this site to ask for help and get a couple smart asses, trying to talk like they actually know they are talking about, I can smell a rookie a mile away. First time and last time at this site, what a joke.
Sorry to tell you that won't work here at all
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