Question about 2001 Harley Davidson FXD Dyna Super Glide
This is typical of all Harley's that I know of. rejetting is not going to help. Since the engine is a single carburetor engine, if you rejet to lean the rear cylinder out, you also lean the front cylinder as well. If it's running correctly now, rejetting to lean the rear will cause the front cylinder to become too lean and overheat.
Since you're complaining of "soot" in the rear pipe, I'm assuming that there is no soot in the front pipe. Most Harleys do tend to have a little difference in the mixture between the two cylinders but this sounds like a bit too much difference to me. The reason for the soot is that the rear cylinder is running richer than the front. A reason for that could be a vacuum leak to the front cylinder causing that mixture to be lean and diverting the fuel to the rear cylinder resulting in a rich mixture in that cylinder. Check for vacuum leaks at the intake to heads junction, at the vacuum port off the carb.
Another suggestion is that usually drag pipes have a "flat spot" in their performance at around 55 to 65 mph due to a lack of backpressure, I'd install a bolt in the rear of the pipes. On most drag pipes, there is a hole to bolt the baffles into the end of the pipe with. Take a 1/4" X 1 1/4" stainless steel bolt and insert it into the hole. Up inside the pipe, put three stainless steel nuts on the bolt. Do this to each pipe. It does not effect the sound of the pipes but does provide just enough backpressure to almost completely eliminate the flat spot.
Posted on Oct 13, 2010
a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
May 22, 2014 | 2005 Harley Davidson FXD - FXDI Dyna Super...
Oct 10, 2012 | Cars & Trucks
Jun 10, 2012 | 2009 kawasaki Vulcan 1700 Classic
Feb 25, 2011 | 2005 Suzuki DR 650 SE
Jul 02, 2009 | Harley Davidson Harley-Davidson Motorcycle...
Jun 28, 2009 | 2008 Harley Davidson FLHX Street Glide
Jun 18, 2009 | 2002 Harley Davidson XL Sportster 883
Apr 15, 2009 | 2002 Suzuki VL 1500 Intruder LC
Nov 10, 2008 | 2002 Triumph Bonneville America
480 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: