Cause Of BackFire ??? - Honda Shadow Forums : Shadow Motorcycle Forum

Reply
 
LinkBack Thread Tools
Old 01-15-2008, 12:35 PM   #1 (permalink)
Member
 
1moxxi1's Avatar
 
Join Date: Nov 2007
Location: Houston, Tx
Posts: 59
Default Cause Of BackFire ???

2000 Honda Shadow 750 ACE
10,000 miles


Sometimes after a downshift, I will get a backfire.

Other than that, the bike runs perfect.

What could be the cause for this?

I do not know when the last tune-up was done.
1moxxi1 is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 01-15-2008, 12:37 PM   #2 (permalink)
Senior Member
 
AngryHatter's Avatar
 
Join Date: Mar 2006
Location: SoCal
Posts: 7,922
Send a message via ICQ to AngryHatter
Default

Lean running.

I usually use Chevron; when I get some gas at Shell, I invariably backfire once or twice.

It's not a problem unless it occurs constantly.
AngryHatter is offline   Reply With Quote Quick reply to this message
Old 01-15-2008, 12:41 PM   #3 (permalink)
Guest
 
Join Date: Jan 2004
Location: St. Louis, MO
Posts: 2,530
Default

It could also be a dirty air filter.

Spark plugs could be slightly fouled or dirty.
Spirit_1100 is offline   Reply With Quote Quick reply to this message
Old 01-15-2008, 01:53 PM   #4 (permalink)
Senior Member
 
AngryHatter's Avatar
 
Join Date: Mar 2006
Location: SoCal
Posts: 7,922
Send a message via ICQ to AngryHatter
Default

Yeah, what Joe said ^^^
AngryHatter is offline   Reply With Quote Quick reply to this message
Old 01-15-2008, 04:23 PM   #5 (permalink)
Senior Member
 
jrh_67's Avatar
 
Join Date: Aug 2007
Location: Lewisville Texas
Posts: 1,084
Default

Is it an actual backfire or is it just popping back, you know like snap crackle pop...
__________________

2007 vtx 1300
2002 Shadow Ace, Gone but not forgotten
Robert
jrh_67 is offline   Reply With Quote Quick reply to this message
Old 01-15-2008, 10:23 PM   #6 (permalink)
Member
 
doc. orwell's Avatar
 
Join Date: May 2007
Location: St. Thomas Virgin Islands
Posts: 78
Default

I don't think what I'm about to share is the cause of your backfiring but others reading this might find some insights into their problem with with this issue. Yesterday as I was riding my Ace it started sputtering and backfiring, it got so bad I had to pull over. I first checked the fuel by turning the valve to reserve as the engine acted as if the gas had ran out, no luck in that. I then gradually revved the engine and found if I did so slowly it would regain some power. I did this for a few minutes and then rode home sputtered and backfired all the way. My neighbors walked over as I pulled into the driveway, and offered advice. "sounds like bad gas....sounds like your plugs need'a changing" etc. I was not convinced. I shut the bike down for a few minutes and then tried to restart it, no luck. Now it would not turn over and the lights were dim. After explaining to one neighbor that it was impossible to "push start" a bike like this, I asked a him for a jump start. This brought the bike alive and running well as long as the jump cables were connected. Getting there I thought, I ran into the house for my Volt meter, and checked the battery. The Voltage ran 10.2 volts. I had lost a cell in the battery while riding along at 50mph. This surprised me in that the battery was two months old. I replaced the battery and the Ace has been running fine. I also ran some voltage checks to see if the bikes charging circuit was doing its job and that it was not overcharging, it was fine. Moral here is that there can be several things that cause backfiring, in this case it was a kaput battery.
__________________
1997 VT 1100 ACE
1979 CX 500 Deluxe
doc. orwell is offline   Reply With Quote Quick reply to this message
Old 01-16-2008, 08:20 AM   #7 (permalink)
Member
 
1moxxi1's Avatar
 
Join Date: Nov 2007
Location: Houston, Tx
Posts: 59
Default

Quote:
Originally Posted by jrh_67
Is it an actual backfire or is it just popping back, you know like snap crackle pop...
It was more like a "pop" sound.
And it isn't every time I downshift, everyone other one or so.

Dirty air filter, as one member suggested?
1moxxi1 is offline   Reply With Quote Quick reply to this message
Old 01-16-2008, 06:27 PM   #8 (permalink)
Member
 
doc. orwell's Avatar
 
Join Date: May 2007
Location: St. Thomas Virgin Islands
Posts: 78
Default

Another source of popping can be an exhaust leak, check the nuts mounting the header pipes to the cylinders.
__________________
1997 VT 1100 ACE
1979 CX 500 Deluxe
doc. orwell is offline   Reply With Quote Quick reply to this message
Old 01-16-2008, 06:42 PM   #9 (permalink)
Member
 
Join Date: Sep 2007
Location: St Louis, MO
Posts: 864
Default

Mine was doing that too. Ran some seafoam through a couple of tanks and it went away.
bike1962 is offline   Reply With Quote Quick reply to this message
Old 01-16-2008, 07:05 PM   #10 (permalink)
Senior Member
 
gat803's Avatar
 
Join Date: May 2005
Location: Michigan
Posts: 5,362
Default

Quote:
Originally Posted by doc. orwell
After explaining to one neighbor that it was impossible to "push start" a bike like this, I asked a him for a jump start.
Excuse me will I hijack this thread for a moment.

I'm curious, what about this bike makes it impossible to push start?



I now return you to your regularly scheduled thread.
__________________
They're coming to get you, Barbara...


gat803 is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Honda Shadow Forums : Shadow Motorcycle Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -4. The time now is 01:29 PM.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.
Motorcycle News, Videos and Reviews
Honda Grom Forum Harley Davidson Forum Honda 600RR Kawasaki Forum Yamaha R6 Forum Yamaha FZ-09 Forum
1199 Panigale Forum Roadglide Forum Honda CBR1000 Forum Vulcan Forum Yamaha R1 Forum Yamaha R3 Forum
Ducati Monster Forum Harley Forums Honda CBR250R Forum ZX10R Forum Star Raider Forum Yamaha Viking Forum
Suzuki GSXR Forum V-Rod Forums Honda Shadow Forum Kawasaki Motorcycle Forum Star Warrior Forum KTM Duke 390 Forum
SV650 Forum BMW S1000RR Forum Honda Fury Forum Kawasaki Versys Forum Drag Racing Forum Ducati 899 Panigale Forum
Suzuki V-Strom BMW K1600 Triumph Forum Victory Forums Sportbikes BMW NineT Forum
Volusia Forum BMW F800 Forum Triumph 675 Forum MV Agusta Forum HD Street Forum Suzuki GW250 Forum
Yamaha Motorcycles Victory Gunner Forum Honda Vultus Forum HD LiveWire Forum Ninja H2 Forum Ducati Scrambler Forum