Popping/backfire - Steve Saunders Goldwing Forums

Closed Thread
 
LinkBack Thread Tools
post #1 of 12 (permalink) Old 10-17-2005, 07:28 PM Thread Starter
mag
Member
 
mag's Avatar
 
Join Date: Feb 2005
Location: Vancouver, British Columbia, Canada
Posts: 475
Send a message via AIM to mag
Post imported post

My bike seems tuned well now -- all plugs read normal/tan, good idle. I'm getting 34mpg in the city/40imp. I'm still getting popping out the left exhaust. Air-cut valve is good. No hesitation to speak of. I'm wondering if it may be holes in the exhaust? My points static timing is bang on, and points brand new. Could this be from a battery no longer holding a load? Also there are definite chafe marks in the spark plug lead wire insulation on that side. I seem to get a fat blue spark though.

Mike
1985 BMW K100RT..wheeee
78 GL1000, naked, restored, on to a happy new home Dec 05
Vancouver
--
previously: 76 GL1000, 82 GL1100
73 BMW R60/5; \'80s Suzuki GS400/GS750/GS850T; \'87 BMW K100RS; \'73 Kawasaki Z1
mag is offline  
Sponsored Links
Advertisement
 
post #2 of 12 (permalink) Old 10-17-2005, 08:56 PM
Postpubescent member
 
exavid's Avatar
 
Join Date: Sep 2004
Location: Medford, County of Jackson, Oregon, USA
Model: None at present
Posts: 36,382
Post imported post

Mag, under what conditions to you get popping? I doubt it's your battery as long as it's staying charged enough to start the bike. Wrap a few layers of electrical tape over the chafed portion of the HV lead. You can also watch for spark leakage in the dark, often you can see blue sparks jumping from the wire to the frame or other places they shouldn't.

ΜΟΛΩΝ ΛΑΒΕ
None at present
Past 'Wings: GL1100, GL1200, GL1500, GL1800

Current BMW C650GT
Paul W.
exavid is offline  
post #3 of 12 (permalink) Old 10-17-2005, 10:38 PM Thread Starter
mag
Member
 
mag's Avatar
 
Join Date: Feb 2005
Location: Vancouver, British Columbia, Canada
Posts: 475
Send a message via AIM to mag
Post imported post

Thanks, Paul. That's what i figured, re: battery. I get popping mostly on downthrottle, but ocassional acceleration, but only out of one side. All the air-cut valve o-rings are good. No vacuum leaks. I'll look for arcing in the dark, and then put some electrical tape on. Is that mileage about right for city use? I always got 40mpg with this bike in good tune (Imp gallons), which is the mileage it's getting now. Seems a shock to get only 33/34 US gallons, but according to Randakk, spirited riding yields 34-36mpg, and Honda states 40mpg (probably hwy use). The bike also has a K&N reusable filter in it, which was serviced recently. I wonder if this is restricting air flow, or possibly too much?

Mike
1985 BMW K100RT..wheeee
78 GL1000, naked, restored, on to a happy new home Dec 05
Vancouver
--
previously: 76 GL1000, 82 GL1100
73 BMW R60/5; \'80s Suzuki GS400/GS750/GS850T; \'87 BMW K100RS; \'73 Kawasaki Z1
mag is offline  
Sponsored Links
Advertisement
 
post #4 of 12 (permalink) Old 10-17-2005, 11:24 PM
Postpubescent member
 
exavid's Avatar
 
Join Date: Sep 2004
Location: Medford, County of Jackson, Oregon, USA
Model: None at present
Posts: 36,382
Post imported post

If you wonder about the K&N filter, you could hook up a vacuum gauge and then with the engine running around 3000rpm, open the airbox over the filter and see how much change if any you got. If the vacuum dropped a couple inches of mercury it would indicate the filter is restricting the airflow.

ΜΟΛΩΝ ΛΑΒΕ
None at present
Past 'Wings: GL1100, GL1200, GL1500, GL1800

Current BMW C650GT
Paul W.
exavid is offline  
post #5 of 12 (permalink) Old 10-18-2005, 08:35 PM
Member
 
nickpipe2's Avatar
 
Join Date: Oct 2005
Location: Harvey, New Brunswick, Canada
Posts: 391
Post imported post

I'm a new user of this forum and havn't owned a goldwing all that long but have been running and working on bikes since I was 14. I am now not 14 any more and have double digit experience with the pleasure of riding and wrenching on motorcycles.

Now all the preambles are out of the way, I had the same problem with my 84 wing and did all the things one first thinks of. Lean carb, gas filter fuel pump ect. ect. It turned out to be bad seals on the mufflers.On deceleration with throttle closed it would suck air into the pipe till it got to the point that enough oxygen was in a fuel rich environment that the heat would ignite the mix and produce a backfire.

Well after that long winded spew of verbage, Check the clamps on the bike where the mufflers fasten to the header pipes and also the crossover pipe might be rusted.

Just my 2 cents worth, Good Luck

Nickpipe2

1984 Gl1200 Std made over to an Aspencade, Black
1959 FLH Hydroglide
1978 Superglide
2003 Custom 124" Beast
Real men ride wearing kilts
Master Electrician, Bagpipe player and rider and wrencher of two wheel vehicles.
nickpipe2 is offline  
post #6 of 12 (permalink) Old 10-18-2005, 08:54 PM Thread Starter
mag
Member
 
mag's Avatar
 
Join Date: Feb 2005
Location: Vancouver, British Columbia, Canada
Posts: 475
Send a message via AIM to mag
Post imported post

well suggested, Nickpipe. It has to be it. I recently put on a set of OEM used mufflers, with new seals, but maybe didn't get them on completely on one side.

Mike
1985 BMW K100RT..wheeee
78 GL1000, naked, restored, on to a happy new home Dec 05
Vancouver
--
previously: 76 GL1000, 82 GL1100
73 BMW R60/5; \'80s Suzuki GS400/GS750/GS850T; \'87 BMW K100RS; \'73 Kawasaki Z1
mag is offline  
post #7 of 12 (permalink) Old 10-18-2005, 09:38 PM
Postpubescent member
 
exavid's Avatar
 
Join Date: Sep 2004
Location: Medford, County of Jackson, Oregon, USA
Model: None at present
Posts: 36,382
Post imported post

Welcome to the Best Goldwing Site on the Internet, Nickpipe2!

Interesting post,hadn't come across that before, now if I can only remember it!



ΜΟΛΩΝ ΛΑΒΕ
None at present
Past 'Wings: GL1100, GL1200, GL1500, GL1800

Current BMW C650GT
Paul W.
exavid is offline  
post #8 of 12 (permalink) Old 10-19-2005, 10:25 PM
Member
 
nickpipe2's Avatar
 
Join Date: Oct 2005
Location: Harvey, New Brunswick, Canada
Posts: 391
Post imported post

Good luck with the backfire prob. Mag, you might check the exhaust o-rings at the head also. I've seen them go bad and cause backfireing on decel.

Thanks for the howdy Exavid, I'll be around a lot as I am currently referbing an 84 GL1200



1984 Gl1200 Std made over to an Aspencade, Black
1959 FLH Hydroglide
1978 Superglide
2003 Custom 124" Beast
Real men ride wearing kilts
Master Electrician, Bagpipe player and rider and wrencher of two wheel vehicles.
nickpipe2 is offline  
post #9 of 12 (permalink) Old 10-19-2005, 10:35 PM Thread Starter
mag
Member
 
mag's Avatar
 
Join Date: Feb 2005
Location: Vancouver, British Columbia, Canada
Posts: 475
Send a message via AIM to mag
Post imported post

I'd be more inclined to think it's the header gaskets, though they are just copper ones. Not sure how that would affect things. I'm pretty certain that with new muffler 'packing' at the header/muffler clamps there were no leaks there. Any suggestions on checking for leaks, other than burning my fingers?

Mike
1985 BMW K100RT..wheeee
78 GL1000, naked, restored, on to a happy new home Dec 05
Vancouver
--
previously: 76 GL1000, 82 GL1100
73 BMW R60/5; \'80s Suzuki GS400/GS750/GS850T; \'87 BMW K100RS; \'73 Kawasaki Z1
mag is offline  
post #10 of 12 (permalink) Old 10-20-2005, 06:31 PM Thread Starter
mag
Member
 
mag's Avatar
 
Join Date: Feb 2005
Location: Vancouver, British Columbia, Canada
Posts: 475
Send a message via AIM to mag
Post imported post

I was able to get about 20-25ยบ turn on the header bolts. It seems to have quieted down the popping considerably. i'll try a little more tightening (with box wrench/hand) when the bike's cold. Sure is running like a champ now.

Mike
1985 BMW K100RT..wheeee
78 GL1000, naked, restored, on to a happy new home Dec 05
Vancouver
--
previously: 76 GL1000, 82 GL1100
73 BMW R60/5; \'80s Suzuki GS400/GS750/GS850T; \'87 BMW K100RS; \'73 Kawasaki Z1
mag is offline  
Closed Thread

  Steve Saunders Goldwing Forums > Forums > Goldwing Technical Forum

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Steve Saunders Goldwing Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
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:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
My buttons are popping off...... redbaron Miscellaneous Forum 4 10-19-2010 12:12 PM
popping through the carbs frenchy1234 Goldwing Technical Forum 9 01-24-2010 08:03 PM
popping and backfire on one side 1200gl skoto1 Goldwing Technical Forum 3 09-15-2009 08:59 AM
Razz popping up to say hi Razz New Members Introduction Forum 21 10-16-2008 03:47 AM
Popping upon deceleration sanfelice Goldwing Technical Forum 12 03-22-2008 05:55 PM

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

 
For the best viewing experience please update your browser to Google Chrome