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Apr 22, 2012 | 05:41 PM

USMCDevilDogg

Thread Starter

Cruiser

Joined: Mar 2012

Posts: 112

Likes: 0

From: SoCal

Need Help

My '99 Sporty keeps backfiring. Last week I knocked out my baffles in my stock exhaust. Today I went for a two hr ride And all of a sudden when my RPM reach 3-4 it starts back firing and sputtering. Then it'll shut off and nothing. Any advice would be great.

Apr 22, 2012 | 06:04 PM

PAsportster

Tourer

Joined: Sep 2008

Posts: 484

Likes: 0

From: PA

runing lean..

Apr 22, 2012 | 06:10 PM

DENGUY

Cruiser

Joined: Oct 2007

Posts: 136

Likes: 0

From: The Florida Keys

Isn't "backfiring" caused by unburned fuel igniting in the exhaust system?

Apr 22, 2012 | 07:21 PM

mrfikser

Outstanding HDF Member

Joined: Oct 2009

Posts: 2,488

Likes: 30

From: Maryland near DC

yea, it sounds like it is running lean, put in a bigger main jet...either that or put in some lollypops

Apr 22, 2012 | 10:16 PM

USMCDevilDogg

Thread Starter

Cruiser

Joined: Mar 2012

Posts: 112

Likes: 0

From: SoCal

If my bike is running lean like everyone is thinking....is there anything I can do at home to fix it or do I have to take it into the shop? Will new exhaust and AC stop this from happening? and what can I do while I save money for the new parts?

Apr 22, 2012 | 10:22 PM

Utah_HD_Rider

Intermediate

Joined: Feb 2012

Posts: 29

Likes: 0

From: Provo Utah

Adding a AC and exhaust will lean it out even more. Pull your plugs and tell us what they look like..

Apr 22, 2012 | 10:31 PM

USMCDevilDogg

Thread Starter

Cruiser

Joined: Mar 2012

Posts: 112

Likes: 0

From: SoCal

I pulled the plugs when I got home..the rear plug was black and dry....the front plug had some white residue on it...people say the new plugs today don't give any clues on a bike running lean. This is my first HD so I'm lost...