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Exhaust Mods


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#16 painterman

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Posted 25 April 2011 - 02:26 AM

I take it the baffles are removable after drilling out the rivets.. what are the options for taking them out, modifying and then re-rivetting? I would like to free up just a little more noise.


I took the rivets out of the rear ends of my exhausts but found that they only held on the ss / chrome end plate, could not be bothered to take off the exhaust to see if I could get the baffles out from the other end so I drilled 6 No. 1/2" holes (2 between each rivet following round in the same circular shape) in each exhaust and replaced the end plate with ss self tappers into the rivet holes, I used small washers to keep the end plate 10mm off the exhaust. You can't see the holes I have drilled unless you look closely. This doesn't make it the noisiest of exhausts but I am more than happy with the sound it gives out. When I take it for the MOT I will remove the washers so the end plate will cover / seal the holes and put them back on after.
I havn't found any difference in the performance of the bike in any way, all I have noticed is that when warm she idles ever so slightly faster, probably due to the lesser amount of back pressure.
Please check with whoever you think fit if you are going to try this. It has worked for me but would not wan't you to have problems of any sort. Perhaps some of the other members may have comments to make?

Trapper.

Hello Trapper I used your method but left the end plates off ,I think it sounds better , a deeper sound compared to the flatter sound with the plates hiding the holes , this is a good mod and cost me bugger all and am well pleased with the sound !
cheers
Painterman

#17 Ffims

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Posted 03 August 2014 - 12:02 PM

How can i see the pictures of how to do the mod they seem to have been removed!

#18 Bungle

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Posted 08 August 2014 - 04:25 AM

start with a smaller gauge drill and do holes at 12, 6, 9 and 3 o'clock. then get a 3/8'' drill and drill out the same holes. I guarantee you'll be impressed. I then did half past one and twenty to nine or something, maybe it was eleven past thirteen, can't remember. But at that stage I thought that a pint or two might be the order and called it quits until I got my WOF (MOT). Bike works very well, better throttle response and more grunt, and MUCH better sound



#19 Ffims

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Posted 08 August 2014 - 12:33 PM

Which plate are the holes in the black one with the rivets in or the one behind it?

#20 Bungle

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Posted 10 August 2014 - 05:26 AM

between the central outlet and the chrome inner. 3/8" is the biggest bit that will fit in that space. Helps if you appreciate the internals of the muffler a diagram of which must be on-line somewhere. Putting holes here simply bypasses the exhaust fold-back that sees the exhaust get to this point before being folded back to the front of the muffler again before exiting out thru the central pipe. All the time being choked up and baffled. Hope this helps

 

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#21 Ffims

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Posted 10 August 2014 - 10:01 PM

Thanks i think i know what you mean will have ago now

#22 Bungle

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Posted 17 August 2014 - 03:47 AM

Let me know what you think mate. Sorry, unfortunately my life's turned real hectic lately so I haven't done pix etc. It does work and it sounds much better. The mechanic who does my WOF tests (MOT in the UK?) races a Kwaka. He reckons it's made my XJR a better performer but most of all he reckons it now sounds "nice" .. good luck



#23 The black one

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Posted 17 September 2020 - 12:20 PM

Anybody know if these are still available anywhere?    http://yamahaxjr1300.com/invision/index.php?app=core&module=attach&section=attach&attach_rel_module=post&attach_id=5553






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