Muffler Cement to Stop Exhaust Leak - Apparently It Doesn't Work!
So this summer I've pretty much had my CFR exhaust off the bike every week trying to stop the damn thing from popping. It basically consists of me sanding down the end of the pipes, cleaning it up with rubbing alcohol, then applying some red RTV. It seems to work for a bit before the popping comes back.
I found that the header pipe was leaking a bit so I replaced the gasket there as well. Well, I visited a muffler shop to find out if they can enlarge the diameter of the header pipe so I can get a tighter fit (I know that a member here did that) but they didn't want to take the chance of making it too large as then I'd be F-ed). They recommended a product called "muffler cement" which I bought a tube of. This stuff hardens once dry.
Well, I applied it to the bike and pipe and it seems to do the trick but for some reason after a short ride it starts to push the pipe back off the header pipe. I tried it twice and the second time I made sure I clamped down hard on it but again, after a 25 minute leisurely ride you can see the pipe starting to back off in this pic. When I started riding the CFR and the header pipe sat flush with no gap.
The cement has cracked where the pipe has backed off. I just can't figure out what is pushing the pipe back off the header? If it was mounted to the bike near the back I'm sure that it would work it's way off the pipe completely after a bit of riding.
I am glad I swapped out to a RH. I notice too that mine even with the new clamp when I had it on was working its way off too. Could it be the mounting setup in the rear? I know it's not a real "solid" braced mount. Just an idea. I mean the mount for the RH is much more solid. For example, I could wiggle the CFR, the RH is rock solid. Maybe a better mounting bracket? Might help?
From what I understand as well, the figure 8 clamp as they say is "one and done." which if that is true, provides to be expensive when intalling and removing the slip on numerous times.
2008 Vivid Black/Orange Stripe VRSCDX 9/20/08
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When I tuned my CFR, it would pop until I richened up the mix. I made it so when the RPMs were high and the gas was backed off, it still added a little fuel. Popping went away. Try that... it might not be a leak.
I hear you Sinic. I've decided that I'll have one more go at the RTV and just live with it.
I'm now worried about the pipe starting to back off the header though but I'll try to ride into work on Wed to test it out. Besides, with the weather we've been hading it's not like I have been missing many riding days! :-o
That paste is for very small spaces! It has no strength! Wheres the clamp to fit around this joint in the pipes? Even a hose clamp will work. You need to be able to "crush" the outer pipe around the inner pipe. Sometimes you need to make the "gaps" in the end of the outer pipe wider to allow this. Expanding the inner pipe will also make this work, just not as easy to do.
2006 Night Rod, almost all the chrome you can get+custom paint.
1976 Triumph T160 stock for the most part.
Buell 2009 1125cr "very red and rapid!"
When you take the CFR off next, place the expanded portion beside the header pipes and align the end of the expanded portion with the tip of the header pipe and mark the spot with a sharpie. Now as you are "tapping the CFR pipe on to the header pipe you can be sure that it is actually going as far on the header pipe as it should. Then tighten down the exhaust bracket.
I also used a stainless steel bolt that was a little larger in diameter than the one that came with the rubber insulator and added a stainless washer and nylon locking nut on the top and bottom. That way if it was trying to slide off the larger bolt would prevent it from occuring.
I also found that the little sharpie mark let me see at a quick glance while riding if anything had moved.
I would also recommend that if it keeps occuring that you contact Cary Faas and ask for his advice. He is a great guy and will be more than willing to share his experiences.
You can ask Max or anyone else he is real customer oriented and I am sure will help you find a solution.
Please be sure your pipe is up on the header pipes as far as it will go. I was fortunate enough to find this issue out before it was too late.... Of course I was having some fun with my previous V-Rod (see pictures in my gallery). 140rwhp always intices you to see what it is capable of.......