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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #1  
Old 26th November 2021
Congojack Congojack is offline
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Default Ironhead engine problem?

Hey guys I have a 76 xlch, I was having a problem where the engine was stuttering when I would open the throttle, it wouldn’t happen all the time and some days were better than others. I first thought carb, since the carb would also spill a lot of gas on kick start(sometimes a lot other times not so much). I rebuilt the carb, noticed that the fuel bowl nozzle wasn’t spraying gas tried to clean, eventually I bought a new fuel bowl( it’s a bendix 38mm carb) and put it back together. At first it was difficult to start, but I messed around with the jet settings and eventually I got it going. It rode pretty good for about two days, today I took it out, I noticed it was backfiring and stuttering a bit. I tried to take off at a red light and it stuttered to go and turned off. I tried to turn it back on and was successful, but when I went to take off it kept stalling. Eventually It didn’t turn back on and I ended up walking about 2 miles back home. Any ideas or suggestions?
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  #2  
Old 27th November 2021
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Are all your grounds good?
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  #3  
Old 27th November 2021
Congojack Congojack is offline
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Quote:
Originally Posted by Gold Member View Post
Are all your grounds good?
Not sure honestly. What should I look for?
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  #4  
Old 27th November 2021
jeffro57 jeffro57 is offline
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crap in your fuel system, start with your tank, lines ,filter then your carb again
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  #5  
Old 27th November 2021
doodah man doodah man is offline
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Still running points? Make sure your point gap hasn’t closed up, and make sure you don’t have a broken advance spring.
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  #6  
Old 27th November 2021
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Fivecats Fivecats is offline
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Fuel tank venting OK?
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Old 27th November 2021
Whitewalls Whitewalls is offline
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Quote:
Originally Posted by doodah man View Post
Still running points? Make sure your point gap hasn’t closed up, and make sure you don’t have a broken advance spring.
+1

These are classic ignition system issues associated with points, condenser and advance.
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  #8  
Old 27th November 2021
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murphy's law states
it probably is the last thing i touched
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  #9  
Old 27th November 2021
Congojack Congojack is offline
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Default

Quote:
Originally Posted by doodah man View Post
Still running points? Make sure your point gap hasn’t closed up, and make sure you don’t have a broken advance spring.
Yeah I’m running points. I’ll have to look into that, I do notice that there is also crap in the tank, so I’ll have to take care of that as well.
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  #10  
Old 27th November 2021
Congojack Congojack is offline
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Default

Quote:
Originally Posted by Fivecats View Post
Fuel tank venting OK?
I believe so, fuel seems to be flowing to the carb, there’s a good amount of fuel in the in line filter
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