Ducati Monster Forum

ok, damn. got the new pipes on and with the angel and the length of the pipes i ended up pretty much covering my turn signals with the tips.

i need to shorten the pipes about 100mm or about 1/3 of the length of the round tube.

how do i do that?

umm, chop saw?

I've been thinking about doing that myself.  Just use a chop saw (with a fine tooth blade) and cut the damn things in half.  Then drill out the rivets on the end cap and rivet it back on to the good half.

There's several posts on coring mufflers that you can find here with a search.  I've looked at them all and from what I can tell, we should just be able to chop the dang things in half and refit the end caps.

good luck and let us know what you come up with.    [coffee]

 

I used an angle grinder with a cut-off wheel-    worked great for me

I also used tape - masking tape for me - around the can - marked my cut line on the tape and fired up the grinder.

Drill out the rivets in the end cap and you may have internals, baffles and or pipe to contend with.

Not rocket science - you can handle it [thumbsup]

As Mash stated a chop saw is the way to go. However, make sure you use a metal cutting blade which is basically just like a big cutoff wheel for a dremel.

 Also, be sure and use some sort of respirator as the dust is toxic.

I want to do this as well..Where do you get the rivets.  Do you buy the tool or is there a better option?

You'll probably want stainless steel rivets - depending on your end caps, etc.

McMaster-Carr is a good source for rivet and rivet tools - not the cheapest, tho

www.mcmaster.com (http://www.mcmaster.com)

You can buy a rivet gun/tool at Sears for under $20. Stainless steel rivets are available locally at Home Depot and hardware stores.

 I think I may have some extras around. Let me know if you need some.  [thumbsup]

cool. thanks all. i shop i know didn't want to touch it saying it would fray all over the place.

this may sound dumb, but dont forget the drill bit to drill the holes for the rivet.

Chop saw is the way to go, but make sure you get a nice clamp down on it so its secure, other wise as you push down the unsecure end of the pipe will lift and cause you get a crook cut. 

What type of blade would you use? 

you can use 14"x1/8"x1" General Purpose Chop Saw Wheel ..Any home depot or lowes have em..

And ive used 3/16 x 1/4" grip aluminum rivets coz home depot or lowes here where i live doesnt have the stainless rivet.They work pretty good as well so far my termi tip still holding up.But if you find stainless rivet better.
Heres the aluminum rivets looks like..(excuse my bad photoshop)
(http://i69.photobucket.com/albums/i46/w7ck7d/my%20696/IMG_0209-1.jpg)

3/16 x 1/4 in rivets are the norm I think. I got mine at West Marine. boating stores have tones of stainless. They are stonger than the aluminum. The bands are ss anyway so I would match it so they look the same. I would take the endcap off first then cut. There might be a perfed tub inside that needs to be cut longer and the packing had to come out in mine too.

Id use a metal disc, never tried using a GP on CF.
The only thing id say to stay away from would probably be wood, they have large teeth that could possibly get caught in the fibers.

ok maybe this is a dumb question, but i've seen those small hand held solid disk circular saws. the disk is about 4 inches diameter. would that work?

also, it does have packing and perforated pipe. so i know i have to take it apart before cutting.

is it hard to cut the packing and put it back it? is there a trick to it?

 If you want the cut to come out straight/even I wouldn't recommend using andthing hand held. The pipes MUST be fully disassembled before cutting. It should be just the CF tube in your hand when you get it all apart.
 If your unsure of what your doing you should let someone who has some experience do it for you.

ok got it. i'll take it to the hobby shop that has a table saw that i can brace the pipe and keep it perfectly straight.

Be aware that if you use stainless rivets, the el cheapo rivet guns may not work well.  I found out the hard way when I cored the stock exhaust.

+1 this is true ..stainless is so hard to be cut with the cheap riveter..

These are from TOB (sorry I can't credit the author, I didn't write down his name/handle):
BEFORE:
(http://i34.photobucket.com/albums/d147/pompino/DSCN2342.jpg)

(1) Remove cans from your bike. Drill out the rivets that hold on the end pieces of your cans. Drill through the center of the rivets until your hear a splintering sound. Then you may need to use pliers to pull the rivets out. Once you have all the rivets removed, you can pop the end pieces off your cans. You’ll probably need to use a hammer and screwdriver as they’re on pretty tight.
(http://i34.photobucket.com/albums/d147/pompino/DSCN2343.jpg)

(2) Then remove the packing from your cans. I used gloves and pliers because the fiberglass can be pretty nasty if it comes in contact with your skin. Also notice that the fiberglass is black from the carbon buildup. All of the parts you pull from your cans will be messy and leave black carbon build-up everywhere.
(http://i34.photobucket.com/albums/d147/pompino/DSCN2345.jpg)

(3) Once you decide how much you want to chop off of your cans, wrap scotch tape around the cans so that you can make a visible cut line and dot have to worry about your CF splintering. When you mark your line measure from the back end of the can and use a flexible straight edge to make your line straight all the way around the can.
(http://i34.photobucket.com/albums/d147/pompino/DSCN2346.jpg)

(4) Next make your initial cut. Cut all the way around through the tape and into the CF but not all the way through. I cut this with a hacksaw with a metal cutting blade. This made it so that I could work slow enough to ensure a straight line.
(http://i34.photobucket.com/albums/d147/pompino/DSCN2347.jpg)

(5) Once I cut all the way around through the tape, I hacksawed through the rest of the CF all the way around. Take your time as you want this cut to be as straight as possible. Only cut through the CF. Do not cut through the inner pipe yet. 
(http://i34.photobucket.com/albums/d147/pompino/DSCN2348.jpg)

(6) Next slide the cut part of the can off the back. You’ll notice that in my example there’s still a heat shield that separates the fiberglass packing from the CF.  If you have a heat shield in there, cut it with a utility knife.
(http://i34.photobucket.com/albums/d147/pompino/DSCN2349.jpg)

(7) Next, pull out the inner shielding that surrounds the inner pipe.
(http://i34.photobucket.com/albums/d147/pompino/DSCN2350.jpg)

(8) Then, cut the inner pipe so that is flush with the end of your CF cans. I used a Dremel tool and the cut was very easy. Just take your time and make sure your cut is even.
(http://i34.photobucket.com/albums/d147/pompino/DSCN2351.jpg)

(9) Once that is finished, slide the wire mesh sleeve back onto the inner pipe and cut it so that is flush with the end of the pipe. Then you must decide if you want to put the packing back in the can or leave it out. If you want to put it back in like I did, then shove it back in there and cut it even with the end of the can. If you want to leave it out, I would recommend using some header wrap and wrap it around the inner pipe so that your CF doest get too hot without the packing to protect it. Then remove the tape from the end of your can and force the end cap back on. Make sure that you get it on all the way. You can tap on it with a rubber mallet to make sure is on all the way.
(http://i34.photobucket.com/albums/d147/pompino/DSCN2352.jpg)

(10) Then drill out your rivet holes and use a pop rivet gun to replace the pop rivets. Use the same size drill bit as the size of the rivets you have. I used 3/1 (5mm) aluminum rivets. Then pop the rivets, and put the cans back on your bike.
(http://i34.photobucket.com/albums/d147/pompino/DSCN2353.jpg)

AFTER:
(http://i34.photobucket.com/albums/d147/pompino/DSCN2358.jpg)

This fellow takes chopping his pipes VERY seriously! Haha they are so short! I love it.
Hell, he can make another set with his left over shit!

Also, as mentioned. Be sure to wear a respirator of some sort.
Silicosis is a nasty business, your lungs will not enjoy it.

yeah i need to cut it down by 100mm. so i'm going from about 350mm to about 250mm total length from the start of the CF to the tip of the CF cap