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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  
Old 1st November 2018
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  
Old 1st November 2018
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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  
Old 2 Weeks Ago
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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  
Old 2 Weeks Ago
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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  
Old 2 Weeks Ago
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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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  #47  
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i do not think fuel is your problem.
higher grades have more retardant for lack of a better word. it will help with ping/detonation but stumble probably not.
i run the lowest grade fuel and have zero issues. the only time there can be issues is when the ambient is high or seasonal fuel blend come around, winter fuels are more volatile to help cold light off.
i do have the ignition trimmed back some and do not run voes, all to reduce clutch off rattle, past that, runs like a banshe. i have over 10:1 static but the dynamic is much lower since the cam over-lap and retarded cam timing help, shifts the power band around 500 rpm up scale. i also have the transmission ratio lower in 1>4 so rpms are higher this helps cancel out the international gearing i run.
i was running well tuned in drags but when i went to highwayman 2/1 the mid stumble raised its head which requires a retune. now that is in high gear but if i drop gears, it goes away. air flow must match load, this is a carb.
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  #48  
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Hi thanks for taking a look.
So if i read that correct you think i should retard the timing a little?
I also have 10:1 comp. And do not have VOES.

I have Never looked at timing before

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  #49  
Old 2 Weeks Ago
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Please don’t go jumping from thing to thing in the hope of getting lucky, it more often than not messes if even a little with something else.
You mentioned that with fresh fuel your bike came back to life OK
The higher the rating, the more control with the burning rate.
Was the 95 octane a true petro-chemical mix, or did was it an ethanol blended fuel ?


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  #50  
Old 2 Weeks Ago
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The carb rebuild kit is probably good to have hanging around.
I’m guessing the stumble was whilst with the throttle in a fixed position ?!?
A possible A/F ratio discrepancy in that part of the range the stumble is in, and it might pay to have it ultrasonically cleaned to ensure that all air and fuel ports are fully clean before utilising it..

Just my thoughts from the symptoms provided


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