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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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  #21  
Old 7th December 2019
budoka budoka is offline
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Default Update

Hello all, thought I’d post up about my progress.

After installing the 44 pilot jet and shimming the needle, the bike runs a lot better. Still a bit of backfire through the carb for the first few minutes after a cold start, but soon goes away. I’ll probably try a 45 or 46 pilot, and try rocketmangb’s plug suggestion and see if that helps, but it’s getting close. Runs wonderfully once warm.

Thanks for all the help guys!!!

-dan
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  #22  
Old 9th December 2019
IXL2Relax's Avatar
IXL2Relax IXL2Relax is offline
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Default

Glad to hear you are getting better ignition operation now...

Quote:
Originally Posted by budoka View Post
My 2002 Sporty has a pretty major backfire through the carb <SNIP>
Info.
Stock engine, heads, pipes. Air cleaner changed by P.O. Converted to points ignition. Stock cv carb, 42 pilot jet. Heads are not breathing into the carb.
Quote:
Originally Posted by budoka View Post
I should have mentioned that it no longer has the VOES or any of the vacuum lines.
Quote:
Originally Posted by budoka View Post
IXL2Relax, that is food for thought indeed. I have to admit that I’m much more comfortable with old school ignitions (I’m mainly from the school of VWs, Shovels, Knuckles, etc) but i know things have been changed over the years for a reason. Hmmm, gotta give the iggy a think or two I guess.
Just to give you some additional food to chew regarding an ignition upgrade:

Here's the Sportsterpedia section on the VOES that explains the concept and value of the upgraded ignition (such as the Ultima) that allows the VOES to choose between two ignition curves...

http://sportsterpedia.com/doku.php/t...lectric_switch

In later models, a MAP (Manifold Absolute Pressure) sensor replaced the VOES for even greater (more pinpoint) control of the ignition timing for various engine load conditions...

Here's the SP REF section on the Ultima Ignition:
http://sportsterpedia.com/doku.php/t...econe_ignition

If you do a seach on Ultima using the google search at the bottom of the page, you'll find lots of threads to read...

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Last edited by IXL2Relax; 10th December 2019 at 14:34..
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  #23  
Old 10th December 2019
budoka budoka is offline
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Default Thanks!

Thanks IXL2Relax,
That is definitely some info to chew on, and I’ll be sure to give it a slow think as soon as I have time. Right now I’m just busy trying to undo 17 years of neglect on this poor bike. I’m showing it some love, though.

Cheers!
-dan
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  #24  
Old 10th December 2019
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Quote:
Originally Posted by budoka View Post
Right now I’m just busy trying to undo 17 years of neglect on this poor bike. I’m showing it some love, though. - Cheers! -dan
Have at it - most bikes respond well to loving care...

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  #25  
Old 18th December 2019
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cantolina cantolina is offline
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Default

You had me at "Converted to points ignition" I. Can't. Even.

Took me half the thread to catch that.

Good Luck!

My suggestion: go back to stock ignition, and try the mods suggested within. Newer technology is rarely worse. Even with the stock ignition, I often had to make mixture changes in Western New York, throughout the year.

Wow. Converted to points.

Quote:
Originally Posted by budoka View Post
First, thanks for taking the time to look at my post. I know you guys have a 1000 and 1 things to be doing and just for looking, THANKS!

my 2002 Sporty has a pretty major backfire through the carb that I’m trying to get sorted. If anyone has some pointers to help me, please do share. I’m no noobie to wrenching, been working on bikes and cars since I was old enough to hand wrenches to my old man, but it’s always good to talk to folks who’ve been there before you.

Info.
Stock engine, heads, pipes. Air cleaner changed by P.O. Converted to points ignition. Stock cv carb, 42 pilot jet. Heads are not breathing into the carb.

At this point I’ve checked the timing, replaced the points/condenser, rebuilt the carb, adjusted the idle mixture up to 4 turns out (still no black smoke out the exhaust). I’ve replaced the intake seals both on the heads and between the carb and intake, and WD-40 sprayed around the intake does not change the idle speed. The diaphragm on the slide is old and stretched and needs a bit of gentle coercing to get back under the cv cap, but responds well when air is fed into the port on the front of the carb. Regardless, I’ve ordered a new diaphragm and slide along with a 44 pilot jet which should be here tomorrow.

The backfire goes away when I open the enrichener a bit, and it gets better as the engine warms up.

Anything I’m missing here?

Many thanks,
-dan
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  #26  
Old 18th December 2019
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rocketmangb rocketmangb is offline
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Where ya been Chuck ?
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  #27  
Old 18th December 2019
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Quote:
Originally Posted by cantolina View Post
~Chuck
Man - Did you just wake up from a Rip Van Winkle ???

You have so many good threads I enjoyed...


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