Hi - I have just bought a stock xb12 muffler (from Pash) which I am going to put on my xb9

I Need to lock open the Valve and just wanted to know if anyone has any advice on how to do it.

Cheers Andy

Weld it open !

For advice, you could ask Tubbs as he is the fine purveyer of modified stock exhausts and will no doubt know what's best to do ...

Thanks mate just pm'd him,

Is there a way to do it without welding it open?

You will lose torque in mid rpm then, more than with an XB12.

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"It is often said that before you die your life passes before your eyes. It is in fact true. It's called living."
Terry Pratchett

do you mean in general? Will I lose torque in the mid range if I were to spot weld it as well

You lose torque if you let the valve open.

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"It is often said that before you die your life passes before your eyes. It is in fact true. It's called living."
Terry Pratchett

Ok, so can I leave it as it is?

The XB12 muffler with the valve closed is basically like a XB9 muffler. This topic had been discussed in the archived threads lately.

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"It is often said that before you die your life passes before your eyes. It is in fact true. It's called living."
Terry Pratchett

Sorry guys I cant seem to find an archive of this kind of topic. can someone post up a link

much appreciated.

I've been running a 12 muffler on my 9 for a fair while now.

Closed = quiet and good torque
1/2 closed is a compromise.
Open = sounds better but less midrange torque.

I have a bar mounted lever to adjust mine.


Put it on the bike and wire the valve open, test it and see what you think.

I'm happy with mine.

Thanks mate - exactly what I was looking for I like the manual valve adjuster you've done, i'm gonna give that a go myself.

did you have to do anything to your ECM?

Thanks - Andy

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08 Specialized Langster

why would you bother with the hastle, surely there is an aftermarket box that would save the worry of the valve setup and would be more suited to your engine charactaristics......xb12r user....

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http://www.swissmotos.ch/

Of course, but any muffler is a compromise. A Remus will behave similar to a stock exhaust with the valve open, a Reverso like with the valve closed... The Buell valve is there to give the best of both worlds...

If you really wanted to, you could buy a servo motor and set the ECM up to make it work like a 12. I know someone that will sell you the servo motor, the cable and the airbox lid.

I also know someone that will create you an EEPROM file to do the job

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08 Specialized Langster

Sounds good could you PM me a price or give me the name of the seller

Cheers