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Old Feb 24th, 2009, 12:33 pm   #1 (permalink)
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Stock Exhaust. Improving low end response?

I still have the stock exhaust on my bike and probably will for a while. I can't justify getting something else right now.

I was reading an older post (which I can't find now) about a relatively cheap way to improve low end throttle response and smooth out the bike a bit. It had something to do with disconnecting the exhaust value and installing an O2 manipulator.

Can anyone help me out here?
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Old Feb 24th, 2009, 1:33 pm   #2 (permalink)
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Do the manipulater, that is the cheapest of the options and will allow more fuel = more power and much smoother.

Your exhaust valve opens at 3750 so won't affect the bottom but more mid range, still worth disconnecting that and making an actuator bar for the stepper motor to trick it.

The other option if you have access to a workshop is to gut the cat as this is a huge hanky stuffed in the middle which is remarkably good at blocking things up.

Have you drilled the airbox top and bottom?, this will improve it as well.
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Old Feb 24th, 2009, 1:39 pm   #3 (permalink)
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This thread is a good start regarding the 02 manipulator...

Better Throttle Response, Less Surging and Popping? - Clike Here
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Old Feb 24th, 2009, 3:29 pm   #4 (permalink)
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This thread is a good start regarding the 02 manipulator...
+1 on the O2 manipulator, worked great on my stock bike to smooth out the throttle response a bit.

I'm selling my Duc 02 manipulator as I picked up a new ECU and exhaust, PM me if interested.
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Old Feb 24th, 2009, 4:13 pm   #5 (permalink)
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1.)Is the O2 manipulator plug and play, or does anything else have to been adjusted, reset, or done by the dealer, for it to work?

2.) Where can I get one?

Thanks
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Old Feb 24th, 2009, 4:41 pm   #6 (permalink)
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Thanks guys.

I'll read through the thread on the O2 manipulator later tonight.

I'll look more into opening up the airbox and stock exhaust. I want to get the bike running as smooth as possible without dropping much money.
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Old Feb 24th, 2009, 6:08 pm   #7 (permalink)
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Quote:
Originally Posted by BigMac038 View Post
1.)Is the O2 manipulator plug and play, or does anything else have to been adjusted, reset, or done by the dealer, for it to work?

2.) Where can I get one?

Thanks
It is plug-n-play, but you can alter the setting on it with a small screwdriver.
There are instructions for recommended settings; I started with that and
then did a small tweak after riding for an hour, have had no problems.
There are no other changes made to the bike itself when you install these.
http://fatduc.com/ is their Website.
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Old Feb 24th, 2009, 6:58 pm   #8 (permalink)
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Will I notice a pretty big difference if I gut the cat, drill out the airbox and install the O2 manipulator?

I also want to lower the gearing a bit. I ride in the city a lot and I'm slipping the clutch going any slower than 20 km/h.
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Old Feb 25th, 2009, 3:03 pm   #9 (permalink)
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Quote:
Originally Posted by dave2riff View Post
It is plug-n-play, but you can alter the setting on it with a small screwdriver.
There are instructions for recommended settings; I started with that and
then did a small tweak after riding for an hour, have had no problems.
There are no other changes made to the bike itself when you install these.
http://fatduc.com/ is their Website.
Just ordered on, Thanks Dave.
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Old Feb 25th, 2009, 3:42 pm   #10 (permalink)
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Quote:
Originally Posted by breakdown View Post
Will I notice a pretty big difference if I gut the cat, drill out the airbox and install the O2 manipulator?

I also want to lower the gearing a bit. I ride in the city a lot and I'm slipping the clutch going any slower than 20 km/h.
Yes to all, cheap and free mods, they are under-airboxed so the more access to air you can give them the better and the cat just blocks them up, you will notice an audible change in the sound for the better too.

14 tooth front sprocket does wonders too, that is what I have.
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