Exhaust pop - BMW Luxury Touring Community
 
LinkBack Thread Tools Display Modes
post #1 of 12 Old May 16th, 2007, 7:20 am Thread Starter
Junior Member
 
Join Date: May 2007
Location: Lakeland, FL, USA
Posts: 5
Exhaust pop

2000 K1200LT
I have an exhaust pop. As I use the engine to brake into a curve or coming to a stop with the throttle closed, when I open the throttle at all I get a fire cracker type of pop. Now this happened with the stock exhaust and stock air filter. It continued to happen with the addition of a K&N filter. It still happens with the now installed Remus pipe and I even installed new exhaust gaskets. I almost decided to add the power commander but after talking to a one very knowledgeable tech help line there is no guarantee that the pop would go away with the addition of the power commander. He said he has tried to remove the pop and to this point "no luck". The bike seems to run just fine but the pop just is annoying.

Anyone have a fix/input
cbrxxdrv is offline  
Sponsored Links
Advertisement
 
post #2 of 12 Old May 16th, 2007, 9:03 am
Senior Member
 
tbarstow's Avatar
 
Join Date: Dec 2004
Location: Trabuco Canyon, CA, USA
Posts: 624
Exhaust pop

Are you running 5000+ RPMs and engine braking?

I'd try using more brake and less engine brake to stop.

Tim Barstow

2004 GSA Silver
2007 X Challenge
tbarstow is offline  
post #3 of 12 Old May 16th, 2007, 5:53 pm
Wrencher Extraordinaire
 
jzeiler's Avatar
 
Join Date: May 2004
Location: Hazel Green, AL, USA
Posts: 13,232
Sounds like you have done a lot already but I have to ask - Have you reset the Motronic and then reestablished the TPS setting for full open and full closed?


After the reset (pull fuse) turn on key - no start- throttle full open then closed twice then turn off key. Now start normally.

John
2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 110 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
K4AN

Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
jzeiler is offline  
 
post #4 of 12 Old May 16th, 2007, 6:47 pm
was
Senior Member
 
was's Avatar
 
Join Date: Apr 2005
Location: Guilford, CT, USA
Posts: 805
From the Chilton manual: Engine Backfires on Deceleration:
If the engine backfires when the throttle is released, check the following:
1) Faulty Motronic control unit. (try resetting the Motronic as advised above)
2) A loose or damaged seal between the cylinder head and exhaust pipes.
3) Check the following engine components:
a. Broken valve springs.
b. Stuck or leaking valves.
c. Worn or damaged camshaft lobes.
d. Incorrect valve timing due to incorrect camshaft installation or a mechanical failure.

Not terribly helpful, I'm afraid. Hopes it is just the Motronic needing to be reset.

Bill
Guilford, CT
'99 Canyon Red K1200 LT - Buddah Bike
was is offline  
post #5 of 12 Old May 16th, 2007, 10:10 pm Thread Starter
Junior Member
 
Join Date: May 2007
Location: Lakeland, FL, USA
Posts: 5
I would say the braking is not extreme and high speed is not needed.

I reset my TPS after I replaced battery.....
when I was done replacing the clutch
I have been lurking a while but this was my first post.

From what the power commander tech said it has to do with the computer shutting down the fuel with the throttle closed, as soon as it is reopened is when it pops. He has dealt with it before and had no luck using the power commander to correct the problem. He made it sound like it was common but the pipe makes it more pronounced. The valve train is fine and I even replaced the plugs with Iridium NGKs just because I could.....the old plugs were fine.

Now here is an interesting tidbit I had not mentioned. When the engine is cold (read rich) it doesn't do it. When I talked with the tech I called it a lean back fire and he said that was not the case. I will come up with a fix, I was hoping that there was someone that already invented the wheel.
I have had several gold wings and would rather fix the k-bike

Is anyone running a Remus pipe ?
cbrxxdrv is offline  
post #6 of 12 Old May 16th, 2007, 10:24 pm
Member
 
Join Date: Jul 2004
Location: East Grand Forks , MN, USA
Posts: 52
Backfire

My '99 LT did the same thing that you described for the first couple of years that I drove it (this is my 5th summer with it). What cured it for me, was when I replaced my throttle cables I sychonized my throttle bodies. Now for the last 15,000 miles it doesn't pop through the muffler like it did before. I can run the revs way up in second and engine brake all the way to idle and it is very smooth.

Give it a whirl!!!
schostev is offline  
post #7 of 12 Old May 16th, 2007, 10:36 pm
Senior Member
 
atrovarious's Avatar
 
Join Date: Apr 2007
Location: Bluefield, VA, USA
Posts: 628
The bike I'm buying tomorrow has a remus and has a pop as well. If there is a solution I'd be interested. The pop is sometimes called an afterburn from what I hear.

Ghaison (Jason)
99 K1200RS Silver and Blue (Sold!)
2004 K1200LT FOR SALE!!!
Bluefield, VA
Sometimes you can get so fixated on the fact that you are right that you lose sight of the reality that it doesn't matter.
-some guy named Ghaison circa 2002


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
atrovarious is offline  
post #8 of 12 Old May 16th, 2007, 11:12 pm
 
Join Date: May 2006
Posts: 173
Ah, the infamous decel popping. I had it on my 2000 as well after Remus and Rhinewest chip install. What cured it for me was 2-fold.

First, the seal between the Remus mid section and can sucks. The compression slot at the clamp is a source for O2 to scavenge in and allow for unburned fuel to "afterburn" in there. Fix? Use some adhesive-backed 2" wide aluminum tape and wrap it around the mid-pipe section several times. This gives the clamp on the can something to bite into and give a good seal. Smear some Hi-Temp copper RTV on there for good measure if you want.

Second, do the 1.25" OD pipe extension modification.
http://www.bmwlt.com/forums/showthread.php?t=939

This tones the beast down dramatically, but also increases backpressure a little bit to keep the O2 from being sucked in. There was no noticable reduction in power or mileage for me.

I can wind the thing to redline through the gears, snap the throttle shut, and nary a burp. Hope it works for you all.

Last edited by Sofitel505; May 16th, 2007 at 11:18 pm.
Sofitel505 is offline  
post #9 of 12 Old May 16th, 2007, 11:56 pm
Senior Member
 
atrovarious's Avatar
 
Join Date: Apr 2007
Location: Bluefield, VA, USA
Posts: 628
Quote:
Originally Posted by Sofitel505
Ah, the infamous decel popping. I had it on my 2000 as well after Remus and Rhinewest chip install. What cured it for me was 2-fold.

First, the seal between the Remus mid section and can sucks. The compression slot at the clamp is a source for O2 to scavenge in and allow for unburned fuel to "afterburn" in there. Fix? Use some adhesive-backed 2" wide aluminum tape and wrap it around the mid-pipe section several times. This gives the clamp on the can something to bite into and give a good seal. Smear some Hi-Temp copper RTV on there for good measure if you want.

Second, do the 1.25" OD pipe extension modification.
http://www.bmwlt.com/forums/showthread.php?t=939

This tones the beast down dramatically, but also increases backpressure a little bit to keep the O2 from being sucked in. There was no noticable reduction in power or mileage for me.

I can wind the thing to redline through the gears, snap the throttle shut, and nary a burp. Hope it works for you all.
I'll give it a shot next week and report back.
Thanks

Ghaison (Jason)
99 K1200RS Silver and Blue (Sold!)
2004 K1200LT FOR SALE!!!
Bluefield, VA
Sometimes you can get so fixated on the fact that you are right that you lose sight of the reality that it doesn't matter.
-some guy named Ghaison circa 2002


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
atrovarious is offline  
post #10 of 12 Old May 17th, 2007, 6:47 am Thread Starter
Junior Member
 
Join Date: May 2007
Location: Lakeland, FL, USA
Posts: 5
I did refit the Remus seal .....not with alum tape but I have some and may give a shot. I really like the throttle body synch idea. that would explain why it is not "every" LT that does it. I have a set of mercury sticks but I'm thinking that they are not going to be used since you gotta disassemble the bike to get to the throttle bodies. I will pull out my maintenance CD and see if they have that listed.....

Ya know the first time I took the plastic off my LT I thought it was a pain.....I can have this stuff off in no time now
cbrxxdrv is offline  
post #11 of 12 Old May 17th, 2007, 7:28 am
Senior Member
 
c00k1e's Avatar
 
Join Date: Dec 2003
Location: Powys, , Wales & Cuba
Posts: 1,876
Mine pops like this if I so a hard decel. What fuse do you pull to do that reset?

Quote:
Originally Posted by jzeiler
Sounds like you have done a lot already but I have to ask - Have you reset the Motronic and then reestablished the TPS setting for full open and full closed?


After the reset (pull fuse) turn on key - no start- throttle full open then closed twice then turn off key. Now start normally.

"Whenever you find you are on the side of the majority, it is time to pause and reflect" Mark Twain


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
c00k1e is offline  
post #12 of 12 Old May 17th, 2007, 8:18 am
was
Senior Member
 
was's Avatar
 
Join Date: Apr 2005
Location: Guilford, CT, USA
Posts: 805
Quote:
Originally Posted by c00k1e
Mine pops like this if I so a hard decel. What fuse do you pull to do that reset?
See the second post by Gilles in this thread: http://www.bmwlt.com/forums/showthre...t=22917&page=1

Bill
Guilford, CT
'99 Canyon Red K1200 LT - Buddah Bike
was is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the BMW Luxury Touring Community 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











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Best place to buy Remus exhaust ... Petre K1200LT 8 Sep 20th, 2006 11:54 pm
Exhaust rattle? mowoc K1200LT 3 Aug 8th, 2006 1:32 pm
My kingdom for an exhaust valve.....anyone???? PhillWard Australia, New Zealand, and AsiaPac 25 Feb 28th, 2006 8:25 pm

Posting Rules  
You may post new threads
You may 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