R1150GS Adventure Backfire w/ new Exhaust

kmroxo · 03-24-2013, 01:47 PM

I bought a Remus Y pipe and Staintune muffler off of an inmate several months ago and I can't ask him for advice, because I deleted all the PMs about the buy. I finally got around to removing the cat and the stock muffler and installed these two. There seems to be a lot of back pressure from the sound and some decent backfires as well. I dug around here and found a picture of the Steptoe jumper from 5 to 6 and made one of those and it still seems to be running the same. The baffle from the Staintune muffler was removed by the previous owner, but I have it.

Jazz62 · 03-24-2013, 01:59 PM

Typically caused by an air leak in the system. Make sure all your exhaust joints are tight but it seems like I've read this a lot where folks have installed a Y-pipe.

JimVonBaden · 03-24-2013, 02:23 PM

Is it backfire or afterfire? Typically removing the cat and opening up the exhaust will cause the amount of after fire to increase a lot. Afterfire is on deceleration, or just slichtly off idle throttle when slowing in gear. If this is the case, this is perfectly normal.

Jim

vagueout · 03-24-2013, 02:23 PM

Agree as above, air leaks would be my first and main suspect.

kmroxo · 03-24-2013, 02:31 PM

It might be after fire. It seems a little sluggish off idle though also and sounds a bit muffled. Aside from putting your hand by the exhaust connections how do you check for exhaust leaks?

Mrmerlin · 03-25-2013, 08:54 AM

it can also be a lean condition this is increased when opening up the exhaust,
my 2001 1150GS also has a pop when on decel or mostly when closing the throttle.
My bike has a full Staintune system from the end of the header pipes to the muffler.

mdmaroon · 03-25-2013, 09:56 AM

I have a Y-Pipe and mine backfires if I abruptly close the throttle after hard acceleration.

I consider it an added benefit.

fred flintstone · 03-25-2013, 04:22 PM

Quote:

Originally Posted by Mrmerlin

it can also be a lean condition this is increased when opening up the exhaust,
my 2001 1150GS also has a pop when on decel or mostly when closing the throttle.
My bike has a full Staintune system from the end of the header pipes to the muffler.

+1. Steptoe jumper mod does not seem to help twin spark engines. The lean condition if uncorrected may cause pinging later when it gets hotter out. I would look into either the wideband dynojet (I have this on my 02 GSA) or Rogers LC1 mod (add-on wideband), these both fool the ECU into running a wideband O2 sensor @ 13.8 AFR (or whatever you set it to) and eliminates most backfires as well as pinging. Plus it runs a hell of a lot smoother and stronger (and quieter).

03-24-2013, 01:47 PM	#1
kmroxo ^OP Reno Rider Joined: Sep 2004 Location: Bethesda, MD Oddometer: 335	R1150GS Adventure Backfire w/ new Exhaust I bought a Remus Y pipe and Staintune muffler off of an inmate several months ago and I can't ask him for advice, because I deleted all the PMs about the buy. I finally got around to removing the cat and the stock muffler and installed these two. There seems to be a lot of back pressure from the sound and some decent backfires as well. I dug around here and found a picture of the Steptoe jumper from 5 to 6 and made one of those and it still seems to be running the same. The baffle from the Staintune muffler was removed by the previous owner, but I have it. __________________ 2004 R1150GS Adventure, Jesse Odyssey I bags, Sargent Low Seat, TT fog lights, Fastway F4 footpegs, Ohlins suspension, Rox Risers, Powerlet wired to old tankbag

03-24-2013, 02:23 PM	#3
JimVonBaden "Cool" Aid! Joined: Feb 2005 Location: Alexandria, VA Oddometer: 41,497	Is it backfire or afterfire? Typically removing the cat and opening up the exhaust will cause the amount of after fire to increase a lot. Afterfire is on deceleration, or just slichtly off idle throttle when slowing in gear. If this is the case, this is perfectly normal. Jim __________________ Click here for BMW Maintenance and Repair DVDs and Corrections. "Combo-Order Discounts!"

03-24-2013, 02:23 PM	#4
vagueout Beastly Adventurer Joined: Mar 2010 Location: sydney, east Oddometer: 1,123	Agree as above, air leaks would be my first and main suspect. __________________ i just seek clarity

03-24-2013, 02:31 PM	#5
kmroxo ^OP Reno Rider Joined: Sep 2004 Location: Bethesda, MD Oddometer: 335	It might be after fire. It seems a little sluggish off idle though also and sounds a bit muffled. Aside from putting your hand by the exhaust connections how do you check for exhaust leaks? __________________ 2004 R1150GS Adventure, Jesse Odyssey I bags, Sargent Low Seat, TT fog lights, Fastway F4 footpegs, Ohlins suspension, Rox Risers, Powerlet wired to old tankbag

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03-24-2013, 01:59 PM	#2
Jazz62 Studly Adventurer Joined: Oct 2009 Location: Midwest Oddometer: 628	Typically caused by an air leak in the system. Make sure all your exhaust joints are tight but it seems like I've read this a lot where folks have installed a Y-pipe.

03-25-2013, 08:54 AM	#6
Mrmerlin 1150GS/Modded Joined: Oct 2009 Location: Aurora CO Oddometer: 243	it can also be a lean condition this is increased when opening up the exhaust, my 2001 1150GS also has a pop when on decel or mostly when closing the throttle. My bike has a full Staintune system from the end of the header pipes to the muffler.

03-25-2013, 09:56 AM	#7
mdmaroon Mike Joined: Sep 2004 Location: British Columbia Oddometer: 157	I have a Y-Pipe and mine backfires if I abruptly close the throttle after hard acceleration. I consider it an added benefit.