Cat Removal

[jwpzx9r]

I want to remove the cat from my header system. I think I can get a welding job done one the system so there should not be a problem just cut it open and remove the core and then make good with a weld. My question is can the induction system cope with this without a total remap of the injection system? I don't want to do this if it involves fitting a power commander and dyno time. Basically what I am saying is its a doddle to do it but what is the knock on effect to the combustion situation? Last thing I would want to do is run the bike weak and burn the exhaust valves and piston tops out Whats the heads up on that job?

 

[Schtum]

If I remember correctly, this is the used GS which you bought from a French dealership recently. It's quite an old 1200, isn't it? If so, you might well get away with it as the fuel maps in the early bikes were relatively rich in comparison with post '96 bikes.

Some people will claim that it doesn't matter on any GS and the bike will be fine as the fuel injection will compensate. This isn't correct - see the link in my sig.

HTH

 

[Spike]

I have fitted a full system to my bike and then fitted a advanced module and it runs so much better

There was on for sale in here a couple of days ago if not i got mine from Here and its a doddle to fit.

spike

Oh I was going to just decat my front pipe but decided on a set of headers instead that way I can put it back to standard when I sell it.

 

[jwpzx9r]

If I remember correctly, this is the used GS which you bought from a French dealership recently. It's quite an old 1200, isn't it? If so, you might well get away with it as the fuel maps in the early bikes were relatively rich in comparison with post '96 bikes.

Some people will claim that it doesn't matter on any GS and the bike will be fine as the fuel injection will compensate. This isn't correct - see the link in my sig.

HTH

cheers

Yes its a 2005 model. I have two options either cut open the cat and do a removal job or hack the cat off and fit some sort of link pipe in stainless. The bike has a BOS carbon can fitted and I thought the beast would breathe a bit easier without that cat The guy across the road does stainless welding and can fabricate pipe work so either way its very doable but I don't want to complicate the job (and create unwanted expense) by having to get injection work done. I think it would be worthwhile, from what I hear, and as there is no MOT here so there is no problem having to have the Cat present.

 

[Sgt Bilco]

You'll be fine removing the CAT as long as you run a baffle in the end can. The 1200's really don't like straight through systems unless you fit a PC3 or something similar

 

[BlueBird]

You'll be fine removing the CAT as long as you run a baffle in the end can. The 1200's really don't like straight through systems unless you fit a PC3 or something similar

Big yawn.

search is yr friend.

Ive,done both and 50k later its as sweet as ever,no flat spot at 5k not too loud and great noise on overun,did cat first,no difference, removed baffle,breathes more freely,spins up quicker,mixture is perfect,at least thats what the plugs say.

 

[2 wheel humvee]

You'll be fine removing the CAT as long as you run a baffle in the end can. The 1200's really don't like straight through systems unless you fit a PC3 or something similar

I agree, having run 2 1200 s on open headers both with akrapovic can fitted and baffle in place (baffle out is anti social and pointlessly noisy with no performance benefit IMHO) with no I'll effects, both ran well and plugs indicated a good mixture, the 09 bike had a module doo da fitted too which may have helped the low speed fuelling a little, not yet sure if I'll bother with open headers on the twin cam as it goes and sounds great as it is

 

[Sgt Bilco]

Big yawn.

search is yr friend.

Ive,done both and 50k later its as sweet as ever,no flat spot at 5k not too loud and great noise on overun,did cat first,no difference, removed baffle,breathes more freely,spins up quicker,mixture is perfect,at least thats what the plugs say.

I had mine Dyno'd a couple of weeks ago when I fitted the PC3. The guy who set it up reckoned with a PC3 the straight through system gives loads more power and fuels really well as I found out when I pulled a wheelie off the throttle in second

Before I had this done, it always ran much smoother and better with a baffle in so maybe it just needed setting up properly

 

[BlueBird]

mine is 05,

i would love to wheelie in 2nd of throttle

any further info avaliable like before and after graphs?

 

[Sgt Bilco]

mine is 05,

i would love to wheelie in 2nd of throttle

any further info avaliable like before and after graphs?

I've got a graph somewhere and I'll see if I can find it. All I know is the guy fuelled it for low and midrange performance and it picks up brilliantly and I'm delighted with it. I'll give you a go on it when I get back from Alaska

 

[Mav]

I had mine Dyno'd a couple of weeks ago when I fitted the PC3. The guy who set it up reckoned with a PC3 the straight through system gives loads more power and fuels really well as I found out when I pulled a wheelie off the throttle in second

Before I had this done, it always ran much smoother and better with a baffle in so maybe it just needed setting up properly

Both of my bikes have straight through Remus systems, and neither run with the baffles in... When I put the original exhaust on the HP to get it through the MOT, it felt super strained, simply would not spin up, even in neutral. Maybe mine has already been remapped... is there a way to check?

 

[Sgt Bilco]

Both of my bikes have straight through Remus systems, and neither run with the baffles in... When I put the original exhaust on the HP to get it through the MOT, it felt super strained, simply would not spin up, even in neutral. Maybe mine has already been remapped... is there a way to check?

I don't think so Mav. The factory fuelling is probably different on every bike.

 

[(RIP) Miff]

mine is 05,

i would love to wheelie in 2nd of throttle

any further info avaliable like before and after graphs?

My standard 05 bike would wheelie in 2nd off the throttle.
But my decatted, Akropoviced model does it so much easier

 

[BlueBird]

well mine won't and never would not without a generous helping of clutch,
I am 17 stone though.