why does my harley davidson spew fire from the exhaust?

8 Comments

1. Rev. Os. says:

   August 25, 2009 at 12:18 am

   Ok here is the correct answer, and rest assured that this will not be expensive. I had this exact same problem just weeks ago on my old shovel head.I tried everything, new plugs, wires, carb intake boots, timing, lifter adjustment, and it still did this only when i reved it up. it idled fine.Your jets are fine if it ran good before so don’t listen to all the garb.Here is the answer bro believe it or not I am 90 % sure it is your key switch. It don’t get enough power to the coil because they go bad from vibration. Here is how to check, run a jumper wire from the hot battery post to your coil and see how it runs then. If it runs good then, replace your switch they are 23 dollars. Do also let me know what you find, I’m at lethaldogs_69@yahoo.com
2. James B says:

   August 25, 2009 at 12:18 am

   Burning to rich
3. Clint M says:

   August 25, 2009 at 12:18 am

   Cool.

   It could be an ignition timing issue, running a bit rich, or even a valve timing issue created by a littel bit of exhaust valve overlap.

   Most likely just running a little rich. No real problem with that and can be adjusted to lean it out. Don’t go too far though. Rich is okay, too lean can be catastrophic.

   Besides people pay good money for flame thrower kits. They’re cool at night.
4. JeffyB says:

   August 25, 2009 at 12:18 am

   50 yr old engine technology
5. REDNECK HOG says:

   August 25, 2009 at 12:18 am

   PROBALY RUNNING RICH AS YOU HAVE BEEN TOLD .BUT DONT LISTEN TO JEFFYB HE PROBALY RIDES A JAP CAN.
6. Bad Mother Clucker says:

   August 25, 2009 at 12:18 am

   Good lord, adjust or rejet your carb, your running way too rich.
7. Skulls says:

   August 25, 2009 at 12:18 am

   You did say type or year, efi or carb, soanyway if you get to much excess fuel or oil in your exhaust the heat from the pipe will cause cookoff and inite causing a flame, causes: jetting,blowby,or evensticking valve,normally on a H-D if you have drags and are a little rich it blow it out and not pop or flash till you let off, burning what is left
8. xjr1300 says:

   August 25, 2009 at 12:18 am

   ive got no idea, but when you find out let me know, maybe i can get my yamaha to do it