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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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  #41  
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Lethal Lethal is offline
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IF possible, maybe return most settings/needles/ int jet / back pressure back to as close as stock as you can, and baby steps one change at a time ??


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  #42  
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Quote:
Originally Posted by Lethal View Post
So many times a mechanical/electrical issue seems to some to be a fuel issue, and vice-versa... and a lot of home mechanics get caught in the cycle of change this change that and end up with something less than ideal, chasing their tales in a never ending cycle.

Can I suggest maybe a ‘lollipop’ mod to create a lil back pressure to get rid of the big swings in AF ratios that the free flowing debaffled mufflers can bring ??

Yeah, ‘S’s are rare here too in Australia, and sooooo hard to find unmolested and almost worth crying over when seen hacked up by those who don’t appreciate this gem of a model


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So true about finding an "S" model unmolested. A Two years search to find a one owner untouched bike I have now. My first EVO and fortunately no problems. Hopefully this stumble problem revels itself so others can learn by it.
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  #43  
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Yeah they’re great, and always good to take back to how they were meant to be, as they were the kickass model to have of their time (and even now surprise a few newer ones)
To me it sounds like a reversion issue combined with a few AF ratio probs that were tweaked when the OP thought it was a fuel thing alone with needle/jetting tweaks/changes
Always hard to tell someone what the issue is when stabbing in the dark without data proving the prob.
One tinker at a time is a safer way to not screw up things too much, as even slight/minor changes changes change the way it does it’s thing is a slow burn but a faster way to not chase ones tail in the search for issue free running.


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  #44  
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Update.
Went for a 500k ride on sat and pretty much got her running sweet.
A very small hesitation thru mid throttle.
I gassed up with high octane fuel 98 octane and it ran perfect. I was happy as i could be.
Hit another small town that only had 95 octane abd filled up and here goes the bloody stumble again....
If i had hair i would pull it out.


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  #45  
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It might pay to take off the air cleaner and when warm and whilst running, spray small mists of water into/around the carb opening, it sounds like carbon deposits may be causing a touch of pre-ignition. If this doesn’t help out perhaps a touch of a reduction of ingnition timing, and if still the same.. well... maybe just shit fuel
Glad it has been narrowed down and it can be the beast that it is !!


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  #46  
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Yeah i will try that.
Have ordered a carb rebuild kit so will run the mist first then rebuild the carb.


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