Black smoke upon shutting EVO off? - Harley Davidson Forums

Carburetor Related Find discussions on carburetor related goodies here. Swap and trades? Rebuild information and tuning for the pre EFI systems.

Black smoke upon shutting EVO off?

Reply

 
 
 
  #1  
Old 02-12-2018, 06:19 PM
hardcandydyna's Avatar
hardcandydyna
hardcandydyna is offline
New Member
Thread Starter
Join Date: May 2013
Location: NJ
Posts: 86
Thanks: 0
Thanked 0 Times in 0 Posts
Default Black smoke upon shutting EVO off?

Took my 99 evo Springer for a ride earlier, let the bike warm up, and upon returning home I noticed when I shut the bike off in the garage some black smoke coming out of my python3 pipes, fired it righ back up and got 2-3 puffs of black smoke and it went away right away, fired it up about a hour later with zero black smoke nor zero issues, anyone ever have this? Or am I over worrying thanks
 

Last edited by hardcandydyna; 02-12-2018 at 06:21 PM. Reason: Misspelled words
Reply With Quote
  #2  
Old 02-13-2018, 07:25 AM
grbrown's Avatar
grbrown
grbrown is offline
Club Member
Join Date: Jun 2007
Location: Bedford UK
Posts: 39,399
Thanked 1,229 Times in 1,141 Posts
Wink

Black smoke usually indicates that your bike is running rich. Any changes, such as to the exhaust etc, are likely to affect your carb/efi, so some adjustment may reduce the problem. If that doesn't work, find someone local who knows how to adjust the tune of your bike!
 
Reply With Quote
  #3  
Old 02-13-2018, 09:29 AM
bustert
bustert is offline
Road Master
Join Date: Aug 2008
Posts: 945
Thanked 117 Times in 113 Posts
Default

i think mr. gr is spot on!!!

for the sporadic nature as you described, my first suspect would be unstable fuel bowl level.
 
Reply With Quote
  #4  
Old 02-13-2018, 03:21 PM
hardcandydyna's Avatar
hardcandydyna
hardcandydyna is offline
New Member
Thread Starter
Join Date: May 2013
Location: NJ
Posts: 86
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Bike hasn’t had any changes, carb was rebuilt this past dec, the previous owner didn’t ride the bike very often, I’m gonna have to get out there and run it, see how the plugs look aswell thank you
 
Reply With Quote
  #5  
Old 02-14-2018, 08:14 AM
bustert
bustert is offline
Road Master
Join Date: Aug 2008
Posts: 945
Thanked 117 Times in 113 Posts
Default

hummm, last dec and not ridden much??

although it may happen, you find the plugs showing excess fuel, never say never, because:

up at highway speeds, fuel demand might exceed fuel leakage rate so the plugs might show normal. however, when you run under leakage rate demand, the fuel will build in the bowl. also factor in that plugs will show diff color according to riding style as engines are not as efficient at low speeds. it could be a fluke or trash in the needle/seat, maybe a loose jet or any other number of things. one thing for sure is excess fuel will wash the oil off the cyl walls and that leads to accelerated wear. such a small thing to check the carb, but it is your machine.
 
Reply With Quote
  #6  
Old 02-15-2018, 03:55 AM
hardcandydyna's Avatar
hardcandydyna
hardcandydyna is offline
New Member
Thread Starter
Join Date: May 2013
Location: NJ
Posts: 86
Thanks: 0
Thanked 0 Times in 0 Posts
Default

I pulled out the paper work from the org owner and it seems when they rebuilt the carb a 45 pilot jet was installed, bike has python pipes and a screamin eagle air cleaner, the bike sat from 2013-2017 and the work was performed when the org owner decided to get the bike up and running again, when parked it didn’t have any issues but I’m gonna remove the carb and go over it all again, they may have the wrong main jet
 
Reply With Quote
  #7  
Old 02-15-2018, 09:14 AM
bustert
bustert is offline
Road Master
Join Date: Aug 2008
Posts: 945
Thanked 117 Times in 113 Posts
Default

main is not your issue unless it is loose since it is not in the circuit. my sport came with a 42 pilot but i installed a 45 which is a common adjustment so i doubt this is an issue either.
 
Reply With Quote
  #8  
Old 02-25-2018, 12:30 PM
hardcandydyna's Avatar
hardcandydyna
hardcandydyna is offline
New Member
Thread Starter
Join Date: May 2013
Location: NJ
Posts: 86
Thanks: 0
Thanked 0 Times in 0 Posts
Default

I honestly think it’s a clogged petcock, it shut off suddenly, I changed to reserve and it fired up with out issue. Bike started to have a miss or hesistation when the throttle was cracked but cleared up in higher RPM, bike doesn’t smoke upon shutting off or back fire anymore, it did sit forwhile so bad gas could be a problem to
 
Reply With Quote
  #9  
Old 02-25-2018, 02:31 PM
Zanthamos's Avatar
Zanthamos
Zanthamos is offline
Club Member
Join Date: Feb 2015
Location: North Dakota
Posts: 692
Thanked 71 Times in 71 Posts
Default

Originally Posted by hardcandydyna View Post
I honestly think itís a clogged petcock, it shut off suddenly, I changed to reserve and it fired up with out issue. Bike started to have a miss or hesistation when the throttle was cracked but cleared up in higher RPM, bike doesnít smoke upon shutting off or back fire anymore, it did sit forwhile so bad gas could be a problem to
Clogged petcock would cause a lean rather than a rich condition. Overfilled float bowl or too large an idle jet would be more along the lines, bad gas can't really see it but it is a possibility, have you not run the tank dry yet? Check to fuel filter at the top of the petcock, maybe there is some debris there and while you at it clean out the tank.
 
Reply With Quote
 
 
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
ybnorml
The Gun Enthusiast
5
07-21-2017 02:34 PM
invaderb
Sportster Models
12
07-01-2017 06:31 PM
pierrat63
General Harley Davidson Chat
6
06-08-2017 11:12 AM
Ultra61
Screamin Eagle CVO Models
6
02-28-2017 12:26 PM
brad75raiders
Evo Classic Models
22
01-21-2017 03:39 PM


Thread Tools
Search this Thread
Quick Reply: Black smoke upon shutting EVO off?


Featured Sponsors
Vendor Directory

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: