XB12R race kit question

[hospitalfood]

Hi all, fitted race kit (pipe and ecm) to my XB yesterday.

is it normal for the bike to backfire a bit when engine braking ???

[riffer]

Popping on overrun is common with big singles and twins, especially with free flowing pipes.

It happens when the throttle is closed at high revs because the engine is drawing more air (acting as an air pump) and the carb can only supply the idle quantity of fuel.

This gives a very lean idle mixture and causes backfiring in the header pipes.

[snot]

That nasty oem muffler was just keeping it quiet..funnily enough

[deanohit]

Awesome dude, bet it sounds really mean now!

And remember, loud bikes save lives, hopefully the cages will get out of the way when they think you are shooting at them.

[Ocean1]

Hi all, fitted race kit (pipe and ecm) to my XB yesterday.

is it normal for the bike to backfire a bit when engine braking ???

Yes.

[Waylander]

hopefully the cages will get out of the way when they think you are shooting at them.

That's been proven, and his bike would be louder than mine so no hopefully about it except hoping they don't shoot back.

[deanohit]

Yea, you'd know all about it aye with a bike that sounds like a machine gun!

[hospitalfood]

thanks Ocean1, thanks all..........
not sure I have done the right thing as I use it as a commuter 5 days a week.......see how it goes I guess......it may be a better all-rounder without the race stuff.
unfortunatly I destroyed the exhaust valve cable on the stock exhaust in my hurry to swap the gear over, as I was awol from work at the time and did not want to get snapped.
so if I want to swap back it will cost more again.........

[Ocean1]

thanks Ocean1, thanks all..........
not sure I have done the right thing as I use it as a commuter 5 days a week.......see how it goes I guess......it may be a better all-rounder without the race stuff.
unfortunatly I destroyed the exhaust valve cable on the stock exhaust in my hurry to swap the gear over, as I was awol from work at the time and did not want to get snapped.
so if I want to swap back it will cost more again.........

I've ridden them with and without race kits, but never on the same bike.
How would you describe the difference, (trying to ignore the sound).

[hospitalfood]

with kit = worse down low.....rough at 2000/2500 rpm, above 3000/3500 is where it really starts to show, winds out faster with more guts. I think it has more power everywhere but it dont feel that way down low, if that makes sense.
there is an exhaust shoot-out I downloaded and read, the race pipe matches the stock or betters it throught rpm range with race ecm, which is more than can be said for just about all the after market pipes, most other after market pipes are just louder untill very high rpm. have dyno charts to prove this.
I dont know if the race pipe makes a big change by itself, dont think it does, more the race ecm than anything. would be good to try the race ecm with stock pipe as comparison.

[Ocean1]

with kit = worse down low.....rough at 2000/2500 rpm, above 3000/3500 is where it really starts to show, winds out faster with more guts. I think it has more power everywhere but it dont feel that way down low, if that makes sense.
there is an exhaust shoot-out I downloaded and read, the race pipe matches the stock or betters it throught rpm range with race ecm, which is more than can be said for just about all the after market pipes, most other after market pipes are just louder untill very high rpm. have dyno charts to prove this.
I dont know if the race pipe makes a big change by itself, dont think it does, more the race ecm than anything. would be good to try the race ecm with stock pipe as comparison.

Interesting. Isn't there also a different intake arangement with the Buell race kit? I didn't really notice any roughness, if anything the delivery felt more linear, seemed not to plataeu like the standard set-up at around 5K. The only slight niggle is the odd no-fire immediately off idle if you grab too much throttle, but mine is idling a tad low...

Not sure you can run the std pipe with the race ecm, don't think there's an output for the exhaust damper servo.

[hospitalfood]

was wondering about the servo, think your right.
the 07 has a different air box than earlier models, have not done any mods to it yet but will hack some of it away ( which will be close to the air box delete mod ) , already less there than earlier models. no duct from below just the intake behind the gas cap/filler.
have had a K&N fitted since 500 kms.
there is a home mod which is easy to do, putting a seperate breather filter on the head breather pipes, standard they run inside the air filter putting dirty air back through the motor to reduce emisions. you may already know this I guess. it should make it run better down low and get rid of the famous buell cough so I have read.

have not really felt a plataeu on mine around 5000 with standard, just seems to wind on

[hospitalfood]

have also heard that the rev limiter cut-out is softer with the standard set-up ( cuts out gradually ) and with the race set-up it is a solid cut-out but have not hit it yet.

[Ocean1]

was wondering about the servo, think your right.
the 07 has a different air box than earlier models, have not done any mods to it yet but will hack some of it away ( which will be close to the air box delete mod ) , already less there than earlier models. no duct from below just the intake behind the gas cap/filler.
have had a K&N fitted since 500 kms.
there is a home mod which is easy to do, putting a seperate breather filter on the head breather pipes, standard they run inside the air filter putting dirty air back through the motor to reduce emisions. you may already know this I guess. it should make it run better down low and get rid of the famous buell cough so I have read.

have not really felt a plataeu on mine around 5000 with standard, just seems to wind on

Airbox on mine has been tweaked, good job too. Just not sure how different it is. Like to know more about the breather re-rout, use a puke can or just a wee pneumatics filter?

have also heard that the rev limiter cut-out is softer with the standard set-up ( cuts out gradually ) and with the race set-up it is a solid cut-out but have not hit it yet.

Never pushed a standard one much but haven't noticed the rev limiter is too savage. Haven't had mine topped out often either. Did notice some red blinkey activity on the instrument cluster last time and looked down very briefly. It was only at 6.4K odd, didn't note the speed or what was blinking, (bit busy) but seemed strange anything should bleat short of the limiter. Any ideas?

[hospitalfood]

try this address for air box breather mod :-

http://www.buellxb.com/article474.htm

no idea about the blinking light sorry. might have to wind it out to see ???