Black Soot buildup from Fat Bob 114
Thread Starter
|
Stage I
Joined: Nov 2020
Posts: 1
Likes: 0
From: Adelaide, South Australia
Black Soot buildup from Fat Bob 114
Hey guys! Long time reader first time poster as I finally couldn't find any existing info on a subject.
I just purchased a new FXFBS 114 and had an S&S 475 cam, lifters and rods, tuner and short shot exhaust installed as new. All was dyno'd and I love having an immaculate bike I can keep immaculate. But I'm noticing a lot of black soot buildup on the bike from the exhausts. I know short shots aren't the best for power, but love the look / sound of them, but the constasnt black soot on the rear wheel, brake disc and swingarm is disheartening. I cleaned it last night and took it for a ride after, only for almost all the black soot to be back when i got back from a short (2miles) ride.
Is this standard? Or is it running too rich? The dealer has been closed since I purchased the bike thanks to COVID lockdown so have been unable to contact them, posting here hoping someone might have some ideas.
Thanks in advance, Mav
I just purchased a new FXFBS 114 and had an S&S 475 cam, lifters and rods, tuner and short shot exhaust installed as new. All was dyno'd and I love having an immaculate bike I can keep immaculate. But I'm noticing a lot of black soot buildup on the bike from the exhausts. I know short shots aren't the best for power, but love the look / sound of them, but the constasnt black soot on the rear wheel, brake disc and swingarm is disheartening. I cleaned it last night and took it for a ride after, only for almost all the black soot to be back when i got back from a short (2miles) ride.
Is this standard? Or is it running too rich? The dealer has been closed since I purchased the bike thanks to COVID lockdown so have been unable to contact them, posting here hoping someone might have some ideas.
Thanks in advance, Mav
Seasoned HDF Member
Joined: Jan 2008
Posts: 13,619
Likes: 11,353
From: State of Confusion
abnormal imo..sounds like tune possibly but that just seems excessive..you know damn well a stock one wouldn't be designed to have that be happening
Seasoned HDF Member
Joined: Sep 2009
Posts: 25,292
Likes: 2,427
From: Eastern NE
+fuel = power...you can reduce, but definitely have a loss. Short Shots are one of the shittiest exhaust - get something longer (e.g. 2-1) and the soot woes go away. Otherwise...invens in more cleaning supplies.
Road Warrior
Joined: Nov 2018
Posts: 1,276
Likes: 1,018
From: Eastern Ont.
If u are getting soot build up in two miles u have a issue, im assuming your tune. If its that rich your bike would be lazy and u defiantly should see black smoke coming out of the exhaust. I would think u would look like a diesel spooling up, when u are on the road.
Club Member
Joined: Apr 2016
Posts: 11,500
Likes: 8,336
From: Inland NW
If so, this is the reason for the soot on your pipes.
Road Warrior
Joined: May 2012
Posts: 1,570
Likes: 117
From: Southeast NC
Trending Topics
Seasoned HDF Member
Joined: Sep 2009
Posts: 25,292
Likes: 2,427
From: Eastern NE
Correct, fuel is "one" factor, but if his AFR's off (rich) it's probably the cause of all the soot spewing out exhaust. OP states bike was dyno'd so surely running rich...f/ power or performance of some sort.
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Southpaw Super Glide: A Left-Hand-Drive 1979 Harley FXE Built to Fit the Rider
Verdad Gallardo
Thread
Thread Starter
Forum
Replies
Last Post