DeBaffle!

Hey dude, theres no real easy way to debaffle the standard pipe. You could do it a number of ways but none of them are simple. The only simple way is to replace it with a straight through affair.

1. Cut the end off and cut/saw/drill/hack the entire guts of the pipe out. Then weld a new piece of perforated tube down the center and repack the space around it with muffler packing. Once thats done just weld the end back on and give it a spray with some sweet matte black heat proof paint <!-- s --><img src="{SMILIES_PATH}/icon_cool.gif" alt="" title="Cool" /><!-- s -->

2. Buy a big drill or hole saw and run it down the inside of the muffler and remove what ever you cut out. This is NOT the recommended way to do it but is probably the cheapest/easiest one.

3. Take it off completely <!-- s --><img src="{SMILIES_PATH}/icon_biggrin.gif" alt="" title="Very Happy" /><!-- s --> I ran it with the muffler off for about a month and got away with it the whole time haha. Warning. This motorcycle sounds EXACTLY like a formula 1 car when you take the muffler off. Haha. Its AWESOME.

Basically my advice to you is, shortcuts never work as well as we'd like and will almost certainly end up costing you more time and money in the long run.

 

It'll run like a bag of hammers, possibly damaging the engine. It will also make your ears bleed, and it will also be bad for the paint as your annoyed neighbours will push it over in the night.

This is a street vehicle, operated in public. Don't be a jerk - our sport has enough bad-will ambassadors as it is.

 

Coz the fizzer has the exup valve, the muffler is only there for noise damping. Though i have no evidence to support my statement, im pretty sure she ran BETTER without the muffler.

dontz125 is completely correct and im sorry for encouraging it. I only ran mine that way as i had misplaced my muffler when moving house and had no other transport. I put it back on once i found it as the kind of attention it attracted is not the desired kind.

Option One is actually my recommended course of action. It will produce a beautiful rich exhaust note and at max revs, she screams her heart out anyway.

 

If your bike ran better without the muffler, you were over-jetted. The muffler does in fact present a significant restriction to exhaust flow, and thus airflow into the engine. Removing it will increase airflow and lean out the mixture, perhaps to the extent that you burn plugs, valves, and even pistons.

 

That hadnt really occurred to me to be honest. My bike had 400 carbs on it so its highly likely that was the case.

 

I just want to add that here in NZ there are little to no laws about the type of muffler you fit to your vehicle. Until 2009, it was legal to run your bike with no muffling at all. It doesnt mean people dont find the noise annoying, and every country has different laws and regulations about this sort of thing, but here we have a much more relaxed approach to vehicle noise.

Dont break the law. Check before you do any modifications to your exhaust.

 

here in qld you're allowed 94 decibels, at half peak power, 1.5 meters away from the exhaust tip at a 45 degree angle. My 2kr at 7,250 was approx 90 decibels with a 30cm stubbie pipe with the baffle taken out. I got it off ebay for 120 i think. (it was a really rough estimate though, i got a mate with the iphone app to stand there and measure it, but if a cop did it officially i doubt the reading would be too different, also cars are only allowed 90decibels <!-- s --><img src="{SMILIES_PATH}/icon_smile.gif" alt="" title="Smile" /><!-- s -->)