[Classic11]

Has anyone else experienced backfiring since day one?? Maybe backfire is too strong a word but I've never had a bike that did so much.

Is it running rich from the factory? Has anyone ran a sniffer on it to see what afr it's running? There's not much as far as emissions to point a finger at. Either way it is by far my least favorite part of the bike. I can live with it

 

[yonderbob]

deceleration "popping"

I love that sound! My VTX did it stock and lots of guys added fuel management systems like Power Commander to stop it. You could also stop it by doing a procedure know to the VTX world as "de-smogging". Basically removing and disabling the PAIR system.

On the 1200R, especially ater adding the Leo Vince pipe, I get the sound when I'm shifting up and winding it out pretty hard, and when I'm shifting down and using some engine braking. Sounds cool... scares cows...

Bob

 

[Hoshiko]

I didn't like it at the beginning but now I just don't care.

 

[drDave]

I thought it was one of those "features" that BMW actually designed in because they liked the sound. .. Doesn't really do anything for me. . .I like a quieter bike anyway.

 

[Classic11]

Not to say I don't occasionally time my downshifts to make sure the person beside me sees me.

 

[Halonk]

I've got the same thing going on mine, have a strong suspicion the previous owner sold it because of that.
Got to agree with yonderbob, though. I rather like it .
Giving the engine some "wellie" or during engine braking it will cause some startled looks from nearby motorists.
It keeps the sheep off the road, and combined with the Acrapovic exhaust, maintains a silly grin on my face.
I had a rather exiting ride the other day, passed rather briskly by a paddock and considering the startled reaction of those poor beast's and their owners, I'll wait a few weeks before I drive that road again.

 

[Classic11]

I've got the same thing going on mine, have a strong suspicion the previous owner sold it because of that.
Got to agree with yonderbob, though. I rather like it .
Giving the engine some "wellie" or during engine braking it will cause some startled looks from nearby motorists.
It keeps the sheep off the road, and combined with the Acrapovic exhaust, maintains a silly grin on my face.
I had a rather exiting ride the other day, passed rather briskly by a paddock and considering the startled reaction of those poor beast's and their owners, I'll wait a few weeks before I drive that road again.

What is a paddock?

 

[Halonk]

In this case I did a copy/paste from wikipedia.org: Quote "A paddock is a small enclosure or field of grassland used to keep horses. It provides an area for exercise and is often situated near the stables. Drainage and a top layer of sand is required in order to keep a suitable surface in the paddock."
In laymans word: A place where rich people play with their pets.

 

[Clem]

What is a paddock?

What's a paddock?
A paddock is a small enclosure or field.
A place where rich people play with their pets.

Well, in America, we call the PITS at a motorcycle race the PADDOCKS.
It's a small enclosure for the bikes, riders and crew.
A ''pit pass'' lets you wander around almost anywhere.
The pit walk lets you meet the riders and crew.
The paddocks are a very popular place.

 

[Classic11]

very nice, we call those pastures (farm animal areas). I knew about the pit/paddock synonym, just didn't make sense in that scenario. Thanks for the clarification.. Next time just put LMGTFY, let me google that for you...

 

[Clem]

Has anyone with a Booster Plug or like device (Acellerator Module) noticed any change in the deceleration sound, or reduction in the backfiring?
Booster plug enriches the mixture. It only operates when the TPS is in open loop operation. Throttle closed. I don't think it effects fueling when your cruising in closed loop mode. I may be wrong.
Anybody have a Booster Plug installed?

Classic11 asked about the air/fuel ratio, or stoichiometric mixture.
14.7 to 1 ? BMW has them on the lean side for fuel economy.
Checking afm before the catalyzer is difficult, and the cat cleans up exhaust gases so well, checking after the cat doesn't help much.

 

[Classic11]

Has anyone with a Booster Plug or like device (Acellerator Module) noticed any change in the deceleration sound, or reduction in the backfiring?
Booster plug enriches the mixture. It only operates when the TPS is in open loop operation. Throttle closed. I don't think it effects fueling when your cruising in closed loop mode. I may be wrong.
Anybody have a Booster Plug installed?

Classic11 asked about the air/fuel ratio, or stoichiometric mixture.
14.7 to 1 ? BMW has them on the lean side for fuel economy.
Checking afm before the catalyzer is difficult, and the cat cleans up exhaust gases so well, checking after the cat doesn't help much.

14.7 is optimal for emissions... its prime for nox and co... Now full throttle should be much richer, I'm assuming its an issue with the pair valve as suggested but I still don't know what that is. there are already two o2 sensors, should be able to watch them with an obd2 scanner. I will be looking more into this in the next week when I get to go back to work on her some moe. what is this booster plug??? Like a power commander?

 

[Clem]

Hey Classic11,
LMGTFY A Booster Plug is a $150 plug-n-play electronic device that fools the ECU into thinking that the temperature is colder than it actually is, so the ECU will in turn, richen the fuel mixture, and improve/cure the lean surging problem many owners complain about.
BoosterPlug
Some owners swear by them. Others who have not tried it say it's just a hoax, snake oil. I personally do not have a burning urge for one. Off idle hesitation and surging are supposedly much improved.

A Power Commander is a much better, higher level device.
Welcome to Power Commander Motorcycle Fuel Injection Tuning Module
Way more expensive, but able to do much more, too.
Why do I feel like a kid preaching to the veteran teacher here?
I am sure you have experience with them. I've seen your previous bike pictures. You're a 'hands-on' kind of guy, too. And much Younger.

I only used one on a 1999 R1100S with a full Laser exhaust system. It helped smooth it out.

BTW Classic11, Congratulation! Can you send me a link to the Motorcyclist magazine article? You've got my address. I can't easily get those bike rags in English over here.

 

[Clem]

Pair valve?LMGTFY

- What is a PAIR?

Pulsed Air Induction Reed valve

PAIR

All this edumakation makes my head hurt.
If I promise to leave it stock, can I go home early?

 

[Classic11]

hmm magic voo doo plug . I have a box on my truck that tells the ecu it's got less fuel and boost so the ecu will bump up the fuel pressure and boost. Also tells my truck it's getting 20+ mpg while realistically getting 12-13. I've had power commanders on two previous 636 ninjas. That is more likely my choice if I ever get my bike put back together