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I went for a ride tonight and I lost one of my slip on mufflers. This is the 3rd time this has happened. Each time it happens I have found a petter more sturdy way to mount them, but I'm still having the same problem. The vibrations from my CB are just to much for the slip on mufflers to handle. I have reverse megaphones mounted to wrapped stock headers. The mufflers are shimmed correctly, I have replaced the bolts and nuts with grade A hardwear, and securly mounted the rear of the mufler to the frame. The only other thing I can think of is somehow using a ruber mount in the rear to absorb some of the vibrations.
I'm getting very frustrated and I'm not sure what to do ther than droping some serious coin on a compleet system. I like the look and sound of my current setup so if I can, I would like to fix this issue.
Thats the funny thing, the bolts are not unthreading. In once case the rear mount broke and the front of the muffler eventually/slowly shook itself loose. They are shimmed correctly so thats not it either. I had one muffler on so securly that a crack developed in the side of it and a few rides later it had made it's may all around the muffler cutting the shell in two. I'm going to have to weld it on, but my concern is that even my welds won't be able to handle the vibration. I have no idea what else to do other than not riding as hard.
I have to figure some way to minimize the vibration, or minimize the transfer of the vibration to the mufflers. One thing just came to mind. I haven't looked at my engin mounts in a while. Maybe it is time to replace them and that may stop some of the vibration. Any thoughts? The bike doesn't run rough at all. In fact it runds strong as hell. This usualy happens when I'm on very windy twisty roads and I'm racing my way up and down the gears.
could try putting a little aluminum tape around the edge of the pipe where you slip the muffler on and see what happens, though I'd also mount it to the frame.
Yup. The mount goes from the side of the exhaust to the bolt where my passenger pegs once were. If it wasn't for that, it would vibrate off twice as fast. Where the brace bolts to the exhaust is where it broke this time. The bolt is still holding the small flange that snapped off and the other end of the brace is still securely fastened to the frame. ???
i dont think its abnormal vibration, most of these bikes vibrate a bit.
i think you should weld on the muffler. thatll keep it on there pretty good, just make sure the weld burns hot enough to stick.
That's teh real question. OK so the mounting on those allows them to slide back and fall off, but stock mufflers didn't do that and they don't crack at low miles. So it's safe to assume that this particular bike has a vibration that causes the exhausts to resonate. It could be because it vibrates too much or it could be a resonance issue. You could try tack welding a strip down the lower inside face where it's out of sight.
That might change the resonant frequency enough to stop it happening again.
If you can weld then this may help, I found an illustration for an exhaust system that combines springs to help keep the pieces together. I had this type of set up on my CB 350 race bike. Just get a piece of coat hanger wire, make a couple of hooks then weld one to your header and one on the can (or two if you want) bolt it together, then stretch the springs over the hooks.
In 3 years of racing I never had an exhaust fall off and believe me, I had that sucker pinned at 10-10500 between shifts.
Just found an old pic of the after crash, this was holding the end cap on, but it's the same as where the can joins the header. The springs (3) did the job, you can see where one was completly shaved off, but the one on top (plus safety wire) and the one on the back held everything together.
Hope this helps.
Graham
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